This glossary summarizes technical, operational, quality, and regulatory abbreviations used across Manufacturing & Industrial Equipment, with a focused reference for the Additive Manufacturing & Machine Tools Practice. It helps executives and practitioners interpret terminology spanning digital design, production processes, materials, metrology, equipment performance, and compliance.
0–9 A B C D E F G H I J L M N O P Q R S T U V W X Y
| 0–9 | |
| 3D | Three-Dimensional: Describes geometry with length, width, and height; in this field, the term is closely associated with digital solid models and layer-by-layer printing. |
| 3MF | 3D Manufacturing Format: An XML-based file format that can carry geometry, units, materials, colors, textures, and production information more reliably than simple triangle-mesh formats. |
| A | |
| ABS | Acrylonitrile Butadiene Styrene: A durable thermoplastic used in material-extrusion printing, particularly for functional prototypes, fixtures, and housings requiring impact resistance. |
| AD | Apparent Density: The mass of loose powder per unit volume before tapping or consolidation. It helps characterize powder packing, spreadability, and batch consistency. |
| AE | Acoustic Emission: A condition-monitoring technique that detects high-frequency elastic waves generated by tool wear, cracking, impact, or other rapidly released energy. |
| AFM | Abrasive Flow Machining: A finishing process that forces abrasive-laden media through or across a component to deburr and smooth internal passages, including complex printed channels. |
| AFSD | Additive Friction Stir Deposition: A solid-state deposition process that uses frictional heating and plastic deformation to build or repair metal components without melting the feedstock. |
| AJM | Abrasive Jet Machining: A nontraditional process that directs a high-velocity stream of abrasive particles at a workpiece for cutting, drilling, deburring, or surface treatment. |
| AM | Additive Manufacturing: The production of parts by joining material from digital model data, usually layer by layer, rather than primarily removing material from stock. |
| AMF | Additive Manufacturing File Format: A standardized XML-based format for transferring geometry, materials, colors, lattices, and related build information to production systems. |
| AMS | Aerospace Material Specifications: Technical specifications published by SAE International that define materials, processes, heat treatments, and qualification requirements used in aerospace production. |
| AMT | The Association For Manufacturing Technology: A North American industry association representing machine-tool and manufacturing-technology providers and supporting market intelligence, standards, and sector development. |
| AMUG | Additive Manufacturing Users Group: A practitioner organization focused on knowledge exchange among users of industrial printing technologies, materials, software, and post-processing systems. |
| ANSI | American National Standards Institute: The organization that coordinates voluntary consensus standards in the United States, including standards affecting machine safety, dimensions, and manufacturing equipment. |
| ANSI B11 | American National Standards Institute B11 Safety Standards for Machines: A family of U.S. standards addressing risk assessment and safeguarding for machine tools and related manufacturing systems. |
| APC | Automatic Pallet Changer: A mechanism that exchanges workholding pallets so loading and unloading can occur while a machining center continues cutting another workpiece. |
| APT | Automatically Programmed Tool: An early high-level numerical-control programming language that introduced concepts still reflected in cutter-location data and computer-aided manufacturing workflows. |
| AS9100 | Quality Management Systems — Requirements for Aviation, Space, and Defense Organizations: The aerospace quality standard used to control production, traceability, risk, configuration, and supplier performance for flight and defense components. |
| ASA | Acrylonitrile Styrene Acrylate: A weather- and ultraviolet-resistant thermoplastic used for printed outdoor components, tooling, fixtures, and functional prototypes. |
| ASME | American Society of Mechanical Engineers: A standards organization whose publications govern areas such as geometric tolerancing, machine tools, pressure equipment, and mechanical testing. |
| ASME B5 | American Society of Mechanical Engineers Machine Tools Standards Committee B5: The committee and associated standards portfolio covering machine-tool performance, interfaces, spindle noses, workholding, and related terminology. |
| ASME Y14.5 | Dimensioning and Tolerancing: The principal U.S. standard for communicating allowable geometric variation on engineering drawings and model-based product definitions. |
| ASTM | American Society for Testing and Materials: The international standards body publishes widely used specifications and test methods for printed materials, mechanical properties, powder characterization, and process qualification. |
| ASTM F42 | Committee F42 on Additive Manufacturing Technologies: The standards committee responsible for terminology, design, materials, processes, testing, qualification, and environmental practices for industrial printing. |
| ATC | Automatic Tool Changer: A machine-tool subsystem that selects and exchanges cutting tools from a magazine, reducing manual intervention and noncutting time. |
| ATEX | Atmosphères Explosibles: European requirements governing equipment and workplaces exposed to potentially explosive atmospheres, including facilities handling combustible metal powders or volatile solvents. |
| AWJ | Abrasive Waterjet: A cutting process that combines high-pressure water with abrasive media to cut metals, composites, ceramics, and other materials with limited thermal distortion. |
| AWS | American Welding Society: A standards and certification organization relevant to wire-arc deposition, directed-energy processes, repair, inspection, and welding-procedure qualification. |
| B | |
| BET | Brunauer–Emmett–Teller: A gas-adsorption method used to determine the specific surface area of powders, which can affect oxidation, reactivity, and processing behavior. |
| BJ | Binder Jetting: A process category in which liquid bonding agent is selectively deposited to join regions of a powder bed, often followed by curing, debinding, infiltration, or sintering. |
| BMD | Bound Metal Deposition: A material-extrusion approach that prints metal-filled bound feedstock and then removes the binder and sinters the part to achieve a dense metal component. |
| B-rep | Boundary Representation: A solid-modeling method that defines a three-dimensional object through connected faces, edges, and vertices and underpins many design and manufacturing applications. |
| BTA | Boring and Trepanning Association: A designation for a deep-hole drilling system that uses an internally supplied cutting fluid and a hollow boring bar to evacuate chips. |
| BTF | Buy-to-Fly Ratio: The ratio of purchased raw-material mass to finished-part mass. It is frequently used to quantify material-saving opportunities for aerospace components. |
| BUE | Built-Up Edge: Workpiece material that adheres to a cutting edge during machining, altering tool geometry and potentially degrading dimensional accuracy and surface finish. |
| C | |
| CAD | Computer-Aided Design: Software-based creation and modification of product geometry used as the digital foundation for machining, simulation, inspection, and layer-based production. |
| CAE | Computer-Aided Engineering: The use of simulation and analysis software to evaluate product performance, manufacturing processes, thermal behavior, distortion, and structural integrity. |
| CAM | Computer-Aided Manufacturing: Software that converts product geometry and process plans into toolpaths, build preparation, machine instructions, and production documentation. |
| CAPA | Corrective and Preventive Action: A structured quality process for eliminating the causes of detected nonconformities and preventing potential failures, especially in regulated production environments. |
| CAPP | Computer-Aided Process Planning: The use of software to develop manufacturing sequences, select equipment and tooling, and connect product design with shop-floor execution. |
| CBN | Cubic Boron Nitride: A superhard cutting-tool material suited to hardened steels, superalloys, and other difficult applications where high hot hardness and wear resistance are required. |
| CFF | Continuous Fiber Fabrication: A printing approach that places continuous reinforcing fibers within a polymer matrix to increase stiffness, strength, or directional performance. |
| CFRP | Carbon-Fiber-Reinforced Polymer: A lightweight composite comprising carbon reinforcement in a polymer matrix, used for printed tooling, fixtures, structural parts, and machined components. |
| CIM | Ceramic Injection Molding: A process using ceramic powder and polymer binder that informs feedstock, debinding, and sintering practices for bound-ceramic printing routes. |
| CIP | Cold Isostatic Pressing: A powder-consolidation process that applies fluid pressure uniformly at ambient temperature and may be used to densify or prepare ceramic and metal preforms. |
| CLDATA | Cutter Location Data: Neutral toolpath information generated by manufacturing software before a postprocessor converts it into instructions for a specific numerical-control system. |
| CLI | Common Layer Interface: A file format that describes two-dimensional layer contours and process information for transferring sliced geometry to layer-based manufacturing equipment. |
| CLIP | Continuous Liquid Interface Production: A continuous vat-photopolymerization method that controls oxygen inhibition near the window to cure resin without conventional stop-and-separate layer cycles. |
| CMC | Ceramic Matrix Composite: A composite with ceramic reinforcement embedded in a ceramic matrix, valued for high-temperature capability and low density but demanding specialized processing and machining. |
| CMM | Coordinate-Measuring Machine: A metrology system that measures physical geometry against nominal coordinates for dimensional inspection, process validation, and machine qualification. |
| CNC | Computer Numerical Control: Computerized control of machine motion, spindle functions, tooling, and auxiliary operations from a programmed set of manufacturing instructions. |
| CoA | Certificate of Analysis: A supplier document reporting tested chemical, physical, or mechanical properties for a material lot, such as metal powder, resin, or feedstock. |
| CoC | Certificate of Conformity: A formal declaration that supplied material, equipment, or parts meet specified purchase, regulatory, or technical requirements. |
| CSAM | Cold Spray Additive Manufacturing: A solid-state process that accelerates powder particles onto a substrate at high velocity, producing deposition through impact and plastic deformation rather than melting. |
| CSG | Constructive Solid Geometry: A modeling method that creates complex objects by combining simple solids through Boolean operations such as union, intersection, and subtraction. |
| CSS | Constant Surface Speed: A lathe-control mode that continuously changes spindle speed as cutting diameter varies to maintain a specified speed at the tool–workpiece interface. |
| CT | Computed Tomography: A nondestructive X-ray inspection technique that reconstructs internal three-dimensional geometry to identify porosity, inclusions, cracks, and dimensional deviations. |
| CT | Cycle Time: The elapsed time required to complete a defined production cycle, used to assess throughput, capacity, bottlenecks, and equipment economics. |
| CTE | Coefficient of Thermal Expansion: A material property describing dimensional change with temperature and an important input to distortion analysis, tolerance planning, and multi-material design. |
| CTS | Coolant Through Spindle: A machine capability that delivers cutting fluid through the spindle and tool to the cutting zone for improved cooling, lubrication, and chip evacuation. |
| CVD | Chemical Vapor Deposition: A coating process that forms a solid layer through chemical reactions of gaseous precursors and is widely used to improve cutting-tool wear resistance. |
| D | |
| DED | Directed Energy Deposition: A process category in which focused thermal energy melts material as it is deposited, enabling large-part production, feature addition, coating, and repair. |
| DED-Arc/M | Directed Energy Deposition of Metal Using an Electric Arc: A standardized process designation encompassing arc-based metal deposition, commonly with wire feedstock, for large structures and repairs. |
| DED-EB/M | Directed Energy Deposition of Metal Using an Electron Beam: A standardized designation for vacuum-based metal deposition in which an electron beam melts incoming feedstock. |
| DED-LB/M | Directed Energy Deposition of Metal Using a Laser Beam: A standardized designation for laser-based metal deposition using powder or wire feedstock for building, cladding, and repair. |
| DfAM | Design for Additive Manufacturing: The design discipline that aligns geometry, materials, orientation, supports, process constraints, and post-processing with layer-based production capabilities. |
| DHA | Dust Hazard Analysis: A systematic assessment of combustible-dust hazards and safeguards, particularly important where reactive metal powders are received, sieved, processed, or recovered. |
| DIN | Deutsches Institut für Normung: Germany’s national standards organization, whose specifications are frequently encountered in machine-tool interfaces, dimensions, testing, and manufacturing documentation. |
| DIW | Direct Ink Writing: An extrusion-based process that deposits viscoelastic inks or pastes to produce polymer, ceramic, composite, biological, or functional-material structures. |
| DLC | Diamond-Like Carbon: A hard, low-friction carbon coating used on cutting tools, dies, molds, and wear components to reduce adhesion and improve service life. |
| DLP | Digital Light Processing: A vat-photopolymerization technique that projects an entire image onto photosensitive resin, curing many points in a layer simultaneously. |
| DLS | Digital Light Synthesis: A commercial continuous photopolymerization process that uses projected light, oxygen control, and programmed thermal curing to produce polymer components. |
| DMA | Dynamic Mechanical Analysis: A materials test that measures mechanical response under oscillating load as temperature, time, or frequency changes, helping characterize polymer behavior. |
| DMD | Direct Metal Deposition: A laser-based deposition process that feeds metal powder into a melt pool to build features, apply coatings, or repair components. |
| DMLS | Direct Metal Laser Sintering: A commercial term for laser powder-bed processing of metals that is widely used in equipment, material, and application discussions. |
| DNC | Direct Numerical Control: A legacy architecture in which a central computer directly supplies program instructions to one or more machine tools. |
| DNC | Distributed Numerical Control: A networked approach for storing, managing, transmitting, and revising programs across multiple computer-controlled machines. |
| DOC | Depth of Cut: The distance a cutting edge penetrates into the workpiece, a primary parameter affecting cutting force, power, heat, tool life, and removal rate. |
| DoD | Department of Defense: The U.S. government department that funds, procures, qualifies, and regulates advanced manufacturing technologies and defense-production supply chains. |
| DoD | Drop-on-Demand: A material-jetting mode in which discrete droplets are generated only when required, supporting controlled deposition of binders, photopolymers, waxes, or functional inks. |
| DPI | Dots Per Inch: A measure of addressable deposition or imaging resolution used for jetting systems, printheads, masks, and layer exposure equipment. |
| DQ | Design Qualification: Documented verification that proposed equipment and system designs satisfy user, quality, safety, and regulatory requirements before installation. |
| DRO | Digital Readout: A display system that reports machine-axis position from encoders or scales, commonly used on manual and conventional machine tools. |
| DSC | Differential Scanning Calorimetry: A thermal-analysis technique used to determine transitions such as melting, crystallization, curing, and glass transition in polymers and feedstocks. |
| DSEAR | Dangerous Substances and Explosive Atmospheres Regulations: United Kingdom rules requiring employers to control fire and explosion risks from dangerous substances, including combustible powders, gases, and solvents. |
| E | |
| EAR | Export Administration Regulations: U.S. rules controlling exports, reexports, and transfers of specified equipment, software, technology, materials, and technical data. |
| EASA | European Union Aviation Safety Agency: The European authority responsible for civil aviation safety regulation and certification, including approval frameworks affecting flight-critical manufactured parts. |
| EBAM | Electron Beam Additive Manufacturing: A wire-fed, vacuum-based deposition approach that uses an electron beam to produce or repair large metal structures. |
| EBM | Electron Beam Machining: A thermal machining process that removes material through a focused beam of high-velocity electrons, typically in a vacuum. |
| EBM | Electron Beam Melting: An established term for powder-bed fusion in which an electron beam selectively melts metal powder under vacuum. |
| EB-PBF | Electron Beam Powder Bed Fusion: A metal printing process that selectively fuses powder using an electron beam, with vacuum processing and elevated bed temperatures. |
| ECG | Electrochemical Grinding: A hybrid process combining electrochemical material removal with abrasive action for low-force machining of conductive, difficult-to-cut materials. |
| ECM | Electrochemical Machining: A noncontact process that removes conductive material through controlled anodic dissolution, producing complex forms without conventional cutting forces. |
| ECP | Electrochemical Polishing: A finishing process that removes a thin surface layer through anodic dissolution to reduce roughness, burrs, and contamination. |
| EDM | Electrical Discharge Machining: A noncontact process that removes conductive material through controlled electrical sparks, enabling precise machining of hard metals and intricate geometries. |
| EDS | Energy-Dispersive X-Ray Spectroscopy: An electron-microscopy technique used to identify elemental composition in powders, inclusions, contamination, coatings, and fracture surfaces. |
| EDX | Energy-Dispersive X-Ray Spectroscopy: An alternative abbreviation for elemental microanalysis performed with an electron microscope or related X-ray detector. |
| EMA | Experimental Modal Analysis: A vibration-testing method that identifies natural frequencies, damping, and mode shapes to evaluate machine, spindle, tool, or workpiece dynamics. |
| F | |
| FAA | Federal Aviation Administration: The U.S. authority responsible for civil aviation regulation and certification, including approval expectations for production and repair of aircraft components. |
| FAI | First Article Inspection: A documented verification that an initial production item conforms to engineering, dimensional, material, and process requirements before routine manufacture. |
| FAT | Factory Acceptance Test: A pre-delivery test demonstrating that equipment satisfies agreed specifications, functions, safety provisions, and performance criteria at the supplier’s facility. |
| FDA | Food and Drug Administration: The U.S. regulator overseeing medical devices and other health products, including validation and production controls for patient-specific or printed devices. |
| FDM | Fused Deposition Modeling: A trademarked material-extrusion process that heats and deposits thermoplastic filament in successive roads and layers. |
| FEA | Finite Element Analysis: A numerical simulation approach used to predict stresses, temperatures, deformation, residual stress, vibration, and structural performance. |
| FEM | Finite Element Method: The mathematical method that divides a complex domain into discrete elements for engineering simulation and process modeling. |
| FFF | Fused Filament Fabrication: A nonproprietary term for material extrusion using heated thermoplastic filament deposited through a nozzle. |
| FFT | Fast Fourier Transform: A computational method that converts time-domain sensor data into frequency spectra for vibration, chatter, spindle, and process diagnostics. |
| FGF | Fused Granulate Fabrication: A material-extrusion approach that processes polymer pellets or granules directly, enabling larger deposition rates and broader feedstock choices. |
| FOV | Field of View: The area or volume captured by an optical system, scanner, camera, microscope, or process-monitoring sensor in one acquisition. |
| FPT | Feed Per Tooth: The distance a cutting tool advances for each engaged tooth, used to set chip load and balance productivity against tool life. |
| FPY | First-Pass Yield: The percentage of units that meet requirements without rework, repair, rerun, or additional processing. |
| FRF | Frequency Response Function: A mathematical relationship between input excitation and measured vibration response used to characterize machine and tool dynamics and predict chatter. |
| FRP | Fiber-Reinforced Polymer: A composite material combining polymer with short, long, or continuous fibers to improve stiffness, strength, dimensional stability, or thermal performance. |
| FTIR | Fourier-Transform Infrared Spectroscopy: An analytical technique used to identify polymers, binders, contaminants, chemical changes, and curing behavior through infrared absorption spectra. |
| G | |
| GD&T | Geometric Dimensioning and Tolerancing: A symbolic engineering language that defines allowable variation in part form, orientation, location, profile, and runout. |
| GHS | Globally Harmonized System of Classification and Labelling of Chemicals: The international framework for hazard classification, labels, pictograms, and safety documentation covering powders, resins, solvents, and metalworking fluids. |
| GR&R | Gauge Repeatability and Reproducibility: A measurement-system study that separates variation attributable to the instrument from variation associated with different operators. |
| H | |
| HAM | Hybrid Additive Manufacturing: Production that combines material deposition with machining or another process in one machine platform or coordinated workflow. |
| HAZ | Heat-Affected Zone: The portion of material whose microstructure or properties change because of adjacent thermal processing without necessarily melting. |
| HCF | High-Cycle Fatigue: Fatigue behavior under many relatively low-stress cycles, often critical when qualifying structural printed parts for aerospace and rotating applications. |
| HDT | Heat Deflection Temperature: The temperature at which a polymer specimen deforms by a specified amount under load, indicating suitability for thermally demanding service or tooling. |
| HEPA | High-Efficiency Particulate Air: A filtration classification used in extraction and containment systems to capture fine airborne particles generated by powders and machining operations. |
| HIP | Hot Isostatic Pressing: A post-processing treatment that applies high temperature and isostatic gas pressure to reduce internal porosity and improve material properties. |
| HIPS | High-Impact Polystyrene: A toughened thermoplastic used for printed parts and, in some material-extrusion systems, as a dissolvable or removable support material. |
| HMC | Horizontal Machining Center: A machining center with a horizontal spindle orientation, often paired with pallets for productive multi-face machining and chip evacuation. |
| HPC | High-Performance Cutting: Machining strategies that combine optimized tools, parameters, engagement, and machine capability to achieve high removal rates and reliable tool life. |
| HPC | High-Pressure Coolant: Cutting fluid supplied at elevated pressure to control heat, break chips, and evacuate material from the cutting zone. |
| HR | Hausner Ratio: The ratio of tap density to apparent bulk density, used as an indicator of powder flowability and cohesiveness. |
| HSC | High-Speed Cutting: Cutting at elevated surface speeds using suitable machines, tools, paths, and process controls to improve productivity or surface quality. |
| HSK | Hohlschaftkegel — Hollow-Shank Taper: A dual-contact, hollow toolholder interface designed for high stiffness, repeatability, and reliable operation at high spindle speeds. |
| HSM | High-Speed Machining: A machining approach using high spindle speeds, feed rates, and optimized engagement to reduce cycle time and manage cutting forces. |
| HSS | High-Speed Sintering: A powder-bed polymer process that deposits an infrared-absorbing agent and uses radiant energy to fuse selected regions. |
| HSS | High-Speed Steel: A family of alloy tool steels retaining hardness at elevated cutting temperatures and used for drills, taps, end mills, and other tools. |
| HVOF | High-Velocity Oxy-Fuel: A thermal-spray process that propels heated coating particles at high velocity to produce dense, wear-resistant surfaces on tools and components. |
| I | |
| IATF 16949 | International Automotive Task Force Quality Management System Standard: The automotive-sector standard emphasizing defect prevention, traceability, process control, and reduction of variation and waste throughout the supply chain. |
| ICI | Inline Coherent Imaging: An optical sensing technique that measures melt-pool or deposition geometry during laser processing to support real-time process monitoring. |
| ICP-MS | Inductively Coupled Plasma Mass Spectrometry: A highly sensitive analytical method used to quantify trace elements and contaminants in metals, powders, and process materials. |
| ICP-OES | Inductively Coupled Plasma Optical Emission Spectrometry: A chemical-analysis method that measures emitted light to determine elemental composition in metals, powders, and solutions. |
| IGES | Initial Graphics Exchange Specification: A legacy neutral format for transferring curves, surfaces, drawings, and models between engineering software systems. |
| IPM | Inches Per Minute: An imperial unit commonly used to specify linear feed rate for machining and machine-axis motion. |
| IPR | Inches Per Revolution: An imperial measure of tool advance for each spindle revolution, commonly used for turning and drilling feed rates. |
| IPT | Inches Per Tooth: An imperial measure of feed per cutting edge used to establish chip load in milling and other multi-tooth operations. |
| IQ | Installation Qualification: Documented verification that equipment and supporting utilities have been installed correctly in accordance with approved specifications. |
| IR | Infrared: Electromagnetic radiation used in polymer sintering, preheating, temperature sensing, thermal imaging, and process monitoring. |
| IRT | Infrared Thermography: A noncontact method for mapping surface temperature and thermal behavior during building, machining, inspection, or equipment diagnostics. |
| ISO | International Organization for Standardization: The global standards organization responsible for widely adopted requirements covering quality systems, machine safety, metrology, data exchange, and industrial printing. |
| ISO 10791 | Test Conditions for Machining Centres: A multipart standards series covering geometric accuracy, positioning, spindle performance, contouring, cutting tests, and other evaluations of machining centers. |
| ISO 12100 | Safety of Machinery — General Principles for Design — Risk Assessment and Risk Reduction: A foundational standard for identifying machinery hazards and applying a structured hierarchy of protective measures. |
| ISO 13485 | Medical Devices — Quality Management Systems — Requirements for Regulatory Purposes: The principal quality-system standard for organizations producing medical devices and associated components. |
| ISO 13849 | Safety of Machinery — Safety-Related Parts of Control Systems: A standards series for designing and validating control functions that reduce machinery risk. |
| ISO 16090 | Machine Tools Safety: A standards series defining safety requirements for machining centers, milling machines, transfer machines, and associated equipment. |
| ISO 230 | Test Code for Machine Tools: A multipart standards series addressing geometric accuracy, positioning, thermal effects, noise, contouring, and measurement uncertainty. |
| ISO 6983 | Automation Systems and Integration — Numerical Control of Machines — Program Format and Definitions of Address Words: The foundational standard underlying conventional letter-address machine programming. |
| ISO 9001 | Quality Management Systems — Requirements: The general international standard for establishing controlled processes, customer focus, corrective action, and continual improvement. |
| ISO/ASTM 52900 | Additive Manufacturing — General Principles — Fundamentals and Vocabulary: The foundational terminology standard defining process categories and core concepts used across industrial printing. |
| ISO/ASTM 52901 | Additive Manufacturing — General Principles — Requirements for Purchased Parts: A standard for specifying and documenting requirements when procuring printed components from internal or external producers. |
| ISO/ASTM 52910 | Additive Manufacturing — Design — Requirements, Guidelines and Recommendations: A standard providing general design guidance across process categories, including manufacturing constraints and communication of requirements. |
| ISO/ASTM 52920 | Additive Manufacturing — Qualification Principles — Requirements for Industrial Processes and Production Sites: A standard addressing quality-relevant controls for production facilities, workflows, personnel, equipment, materials, and records. |
| ISO/ASTM 52930 | Additive Manufacturing — Qualification Principles — Installation, Operation and Performance of Laser-Beam Powder-Bed-Fusion Equipment: A standard defining qualification activities used to demonstrate that metal production equipment is installed and performs as intended. |
| ISO/IEC 17025 | General Requirements for the Competence of Testing and Calibration Laboratories: The international standard for laboratory competence, impartiality, validated methods, traceability, and reliable test or calibration results. |
| ITAR | International Traffic in Arms Regulations: U.S. controls governing defense articles, services, and technical data, including certain digital manufacturing files, machines, and production activities. |
| J | |
| JIS | Japanese Industrial Standards: National standards used for materials, dimensions, tooling, machine components, testing, and manufacturing practices in Japanese and global supply chains. |
| L | |
| LBM | Laser Beam Machining: A thermal process that uses focused laser energy for cutting, drilling, marking, texturing, or removing material without mechanical contact. |
| LCA | Life Cycle Assessment: A method for quantifying environmental impacts across raw-material extraction, manufacturing, use, transport, and end-of-life stages. |
| LCD | Liquid Crystal Display: A pixel-addressable mask used in many vat-photopolymerization machines to expose and cure an entire resin layer. |
| LCF | Low-Cycle Fatigue: Fatigue involving relatively few cycles at higher strain levels, important for components subjected to severe thermal or mechanical loading. |
| L-DED | Laser Directed Energy Deposition: A process in which laser energy creates a melt pool while powder or wire is delivered to build, coat, or repair metal features. |
| LED | Linear Energy Density: A process metric commonly calculated from beam power divided by travel speed to compare energy input along a scan or deposition path. |
| LEL | Lower Explosive Limit: The minimum concentration of a flammable gas or vapor in air that can propagate combustion under specified conditions. |
| LENS | Laser Engineered Net Shaping: A commercial laser deposition process that injects metal powder into a focused melt pool to build or repair components. |
| LEV | Local Exhaust Ventilation: Source-capture ventilation used to control airborne powder, mist, dust, fumes, and vapors near manufacturing equipment or workstations. |
| LMD | Laser Metal Deposition: A directed-energy process that melts delivered metal powder or wire to form coatings, features, repairs, or complete components. |
| LOC | Limiting Oxygen Concentration: The highest oxygen concentration below which a specified fuel mixture cannot propagate combustion under defined test conditions. |
| LOF | Lack of Fusion: A defect caused by incomplete bonding between adjacent tracks or layers, often associated with inadequate energy input, poor overlap, or contamination. |
| LOM | Laminated Object Manufacturing: A sheet-lamination process that bonds successive layers of material and cuts each layer to shape. |
| LOTO | Lockout/Tagout: An energy-isolation procedure intended to prevent unexpected startup or release of hazardous energy during servicing and maintenance. |
| LPBF | Laser Powder Bed Fusion: A process that selectively fuses successive layers of powder with a laser and is widely used for high-value metal components. |
| LVDT | Linear Variable Differential Transformer: A precision displacement sensor used in metrology, machine calibration, gauging, and closed-loop position measurement. |
| M | |
| MAM | Metal Additive Manufacturing: The production of metal components through layer-wise or deposition-based processes using powder, wire, sheet, or bound feedstock. |
| MBD | Model-Based Definition: A product-definition approach in which the authoritative three-dimensional model contains dimensions, tolerances, annotations, and manufacturing information. |
| MCS | Machine Coordinate System: The fixed coordinate reference established by a machine’s home position and used as the basis for work and tool offsets. |
| MDI | Manual Data Input: A numerical-control operating mode that allows an operator to enter and execute individual commands or short instruction blocks directly. |
| MEC | Minimum Explosible Concentration: The lowest airborne concentration of combustible dust capable of propagating an explosion under specified test conditions. |
| MEX | Material Extrusion: A standardized process category in which material is selectively dispensed through a nozzle or orifice. |
| MFI | Melt Flow Index: A measure of how readily a thermoplastic flows under specified temperature and load conditions, supporting feedstock comparison and process control. |
| MFR | Melt Flow Rate: The mass or volume of molten polymer passing through a standardized die over a defined period under specified conditions. |
| MIE | Minimum Ignition Energy: The smallest spark energy capable of igniting a specified dust cloud or flammable mixture under defined test conditions. |
| MIM | Metal Injection Molding: A high-volume process using metal powder and polymer binder whose feedstock, debinding, and sintering principles also inform bound-metal printing. |
| MJF | Multi Jet Fusion: A commercial polymer powder-bed process that jets fusing and detailing agents before applying thermal energy across each layer. |
| MJT | Material Jetting: A standardized process category in which droplets of build material are selectively deposited and then solidified or cured. |
| MMC | Metal Matrix Composite: A material combining a metallic matrix with reinforcing particles, fibers, or structures to tailor stiffness, wear, thermal, or strength properties. |
| MPG | Manual Pulse Generator: A handwheel that generates incremental commands for precise manual movement of machine axes during setup, touching off, or inspection. |
| MPM | Melt Pool Monitoring: In-process sensing of melt-pool radiation, size, shape, temperature, or dynamics to identify abnormal process behavior and support quality assurance. |
| MQL | Minimum Quantity Lubrication: A machining strategy that applies a small, controlled amount of lubricant near the cutting edge instead of flooding the work zone. |
| MRO | Maintenance, Repair, and Overhaul: Activities that restore or sustain equipment and components, including applications for printed spares, repair deposition, and replacement tooling. |
| MRR | Material Removal Rate: The volume of workpiece material removed per unit time, a core measure of machining productivity and process intensity. |
| MSA | Measurement Systems Analysis: A structured evaluation of measurement variation, bias, stability, linearity, repeatability, and reproducibility. |
| MSLA | Masked Stereolithography Apparatus: A vat-photopolymerization system that uses a pixelated mask, commonly an liquid-crystal panel, to expose each layer. |
| MTB | Machine Tool Builder: A manufacturer that designs, assembles, integrates, and supports machining equipment and its principal subsystems. |
| MTBF | Mean Time Between Failures: A reliability measure representing average operating time between repairable equipment failures. |
| MTM | Multitasking Machine: A machine tool combining capabilities such as turning, milling, drilling, and sometimes grinding or deposition within one platform. |
| MTTR | Mean Time to Repair: A maintainability metric representing the average time required to diagnose, repair, test, and return failed equipment to service. |
| MWF | Metalworking Fluid: A liquid used to cool, lubricate, flush, and protect workpieces and tools during cutting, grinding, and forming operations. |
| N | |
| Nadcap | National Aerospace and Defense Contractors Accreditation Program: An industry-managed accreditation program for special processes and quality systems used by aerospace and defense suppliers. |
| NC | Numerical Control: Automated control of machine motion and functions through coded instructions, forming the basis of modern computerized machine operation. |
| NCR | Nonconformance Report: A controlled record documenting a departure from specified requirements and its evaluation, disposition, correction, and follow-up. |
| NDE | Nondestructive Evaluation: The broader engineering assessment of material or component condition without impairing future use, including interpretation of inspection data and fitness implications. |
| NDT | Nondestructive Testing: Inspection methods that identify surface or internal discontinuities without damaging the part, such as radiography, ultrasonics, and penetrant testing. |
| NFPA | National Fire Protection Association: The organization that publishes fire, electrical, and combustible-material standards relevant to machinery and powder-handling facilities. |
| NFPA 660 | Standard for Combustible Dusts and Particulate Solids: A consolidated fire-safety standard addressing combustible-dust hazard analysis, prevention, protection, housekeeping, and management systems. |
| NIR | Near-Infrared: A portion of the infrared spectrum used in temperature sensing, process monitoring, spectroscopy, and some polymer-heating systems. |
| NIST | National Institute of Standards and Technology: The U.S. measurement institute supporting manufacturing standards, reference methods, calibration traceability, process research, and metrology. |
| NPJ | Nanoparticle Jetting: A commercial process that jets suspensions containing metal or ceramic nanoparticles and consolidates the deposited material through thermal treatment. |
| NRTL | Nationally Recognized Testing Laboratory: A U.S. laboratory recognized by the Occupational Safety and Health Administration to test and certify specified workplace equipment against applicable standards. |
| NURBS | Non-Uniform Rational B-Splines: Mathematical representations of curves and surfaces used in product design, toolpath generation, reverse engineering, and geometric data exchange. |
| O | |
| OCT | Optical Coherence Tomography: A noncontact imaging technique that uses low-coherence light to obtain depth-resolved measurements of surfaces or translucent structures. |
| ODH | Oxygen Deficiency Hazard: A risk created when inert process gases displace breathable oxygen in enclosed or poorly ventilated areas. |
| OEE | Overall Equipment Effectiveness: A performance measure combining availability, production rate, and quality to quantify how effectively equipment capacity is used. |
| OEL | Occupational Exposure Limit: A maximum recommended or regulated workplace exposure to an airborne substance over a specified averaging period. |
| OEM | Original Equipment Manufacturer: The company that designs and supplies the primary machine, subsystem, or branded production equipment rather than acting solely as a reseller. |
| OES | Optical Emission Spectroscopy: An analytical technique that determines elemental composition from light emitted by excited atoms, commonly used for metal-alloy verification. |
| OMA | Operational Modal Analysis: A method for estimating structural vibration modes from measured operating responses without applying a separately measured excitation force. |
| OMM | On-Machine Measurement: Dimensional or geometric measurement performed within production equipment to verify setup, monitor processes, or reduce separate inspection steps. |
| OMP | On-Machine Probing: The use of spindle- or table-mounted probes to locate workpieces, establish offsets, inspect features, and detect tool condition. |
| OQ | Operational Qualification: Documented evidence that installed equipment operates throughout its specified ranges and performs required functions under controlled conditions. |
| OSHA | Occupational Safety and Health Administration: The U.S. agency that establishes and enforces workplace safety requirements, including machine guarding, hazardous energy, exposure, and electrical practices. |
| OT | Optical Tomography: A layer-wise monitoring method that records optical process emissions to detect anomalies and assess build consistency. |
| P | |
| PA | Polyamide: A family of engineering thermoplastics, including nylon grades, widely used in powder-bed fusion and material-extrusion systems. |
| PAM | Polymer Additive Manufacturing: The production of polymer components using extrusion, powder-bed fusion, vat photopolymerization, jetting, or related layer-based methods. |
| PBF | Powder Bed Fusion: A standardized process category in which thermal energy selectively fuses regions of a powder bed. |
| PBF-EB/M | Powder Bed Fusion of Metal Using an Electron Beam: The standardized designation for electron-beam fusion of metal powder in a vacuum environment. |
| PBF-LB/M | Powder Bed Fusion of Metal Using a Laser Beam: The standardized designation for laser-based fusion of metal powder, used in specifications and qualification documents. |
| PC | Polycarbonate: A strong, temperature-resistant engineering thermoplastic used for functional printed parts, tooling, fixtures, and housings. |
| PCBN | Polycrystalline Cubic Boron Nitride: A superhard cutting-tool material used for high-speed machining of hardened ferrous materials and selected superalloys. |
| PCD | Polycrystalline Diamond: A highly wear-resistant cutting-tool material used for nonferrous metals, composites, graphite, ceramics, and abrasive polymers. |
| PCS | Part Coordinate System: A geometric reference attached to the component and used to align design, build, machining, and inspection data. |
| PE | Polyethylene: A family of chemically resistant thermoplastics used in selected extrusion, powder, and specialized printing applications. |
| PEEK | Polyether Ether Ketone: A high-performance thermoplastic valued for heat resistance, strength, chemical resistance, and use in aerospace, medical, and industrial components. |
| PEI | Polyetherimide: A high-temperature engineering thermoplastic used for durable printed parts, tooling, fixtures, and transportation applications. |
| PEKK | Polyetherketoneketone: A high-performance thermoplastic offering thermal, chemical, and mechanical properties suited to demanding aerospace and industrial applications. |
| PEL | Permissible Exposure Limit: A legally enforceable U.S. occupational exposure threshold for a substance, generally stated as a time-weighted concentration or ceiling. |
| PETG | Polyethylene Terephthalate Glycol-Modified: A readily processed thermoplastic used for functional prints requiring toughness, chemical resistance, and relatively low warpage. |
| PIM | Powder Injection Molding: The broader process family encompassing metal and ceramic injection molding and sharing debinding and sintering principles with bound-feedstock printing. |
| PLA | Polylactic Acid: A commonly extruded thermoplastic used extensively for prototypes, patterns, models, and lower-temperature applications. |
| PMI | Product and Manufacturing Information: Dimensions, tolerances, annotations, material requirements, and other production data embedded within or associated with a digital product model. |
| PP | Polypropylene: A lightweight, chemically resistant thermoplastic used in selected extrusion and powder-based systems for functional and flexible components. |
| PPAP | Production Part Approval Process: An automotive supply-chain process demonstrating that design records, production methods, tooling, measurements, and controls can consistently meet requirements. |
| PPQ | Process Performance Qualification: Documented evidence that a production process operating within established parameters can repeatedly produce conforming output. |
| PPS | Polyphenylene Sulfide: A high-temperature, chemically resistant engineering thermoplastic used for demanding industrial, electrical, and transportation components. |
| PPSU | Polyphenylsulfone: A tough, heat-resistant thermoplastic used for sterilizable medical components, fluid-handling parts, and demanding functional prototypes. |
| PQ | Performance Qualification: Documented demonstration that equipment and its process consistently meet predetermined performance requirements under routine production conditions. |
| PSD | Particle Size Distribution: The measured proportions of particles across a range of sizes, influencing powder flow, packing, spreading, melting, and finished-part quality. |
| PSU | Polysulfone: A heat-resistant engineering thermoplastic used in specialized printing applications requiring dimensional stability and chemical resistance. |
| PVA | Polyvinyl Alcohol: A water-soluble polymer commonly used as removable support material in compatible extrusion systems. |
| PVD | Physical Vapor Deposition: A vacuum coating process used to apply hard, thin films that improve cutting-tool wear resistance, lubricity, and thermal performance. |
| Q | |
| QMS | Quality Management System: The documented framework of responsibilities, procedures, controls, records, and improvement activities used to ensure consistent conformity. |
| R | |
| REACH | Registration, Evaluation, Authorisation and Restriction of Chemicals: The European Union chemicals regulation governing information, risk controls, and restrictions for substances used in powders, polymers, coatings, and fluids. |
| RH | Relative Humidity: The amount of water vapor in air relative to saturation, affecting moisture-sensitive powders, filaments, resins, dimensional stability, and metrology. |
| RPM | Revolutions Per Minute: A rotational-speed unit used for spindles, rotary tables, tools, workpieces, pumps, and other rotating equipment. |
| RTCP | Rotation Tool Center Point: A multi-axis control function that compensates linear axes during rotary motion so the programmed tool point remains on the intended path. |
| S | |
| SAE | Society of Automotive Engineers: The standards organization publishes material, aerospace, mobility, and manufacturing specifications used in qualification and supply-chain documentation. |
| SAF | Selective Absorption Fusion: A polymer powder-bed process that applies an absorption fluid selectively and then uses infrared energy to fuse the patterned regions. |
| SAT | Site Acceptance Test: Verification performed after equipment installation to confirm functionality, interfaces, safety, utilities, and performance in the customer’s production environment. |
| SDS | Safety Data Sheet: A standardized document describing chemical hazards, exposure controls, storage, handling, emergency measures, and disposal requirements. |
| SEM | Scanning Electron Microscopy: High-resolution imaging used to examine powder morphology, microstructure, fracture surfaces, coatings, contamination, and manufacturing defects. |
| SFM | Surface Feet Per Minute: An imperial measure of cutting speed at the tool–workpiece interface used to select spindle speed and tooling parameters. |
| SHL | Sheet Lamination: A standardized process category in which sheets of material are bonded to form a part and may be cut before or after joining. |
| SLA | Stereolithography: A vat-photopolymerization process that selectively cures liquid photosensitive resin with a light source to form solid layers. |
| SLD | Stability Lobe Diagram: A machining-dynamics chart that maps stable and unstable combinations of spindle speed and cutting depth to help avoid chatter. |
| SLM | Selective Laser Melting: An established commercial term for laser powder-bed fusion that fully melts metal powder to form dense components. |
| SLS | Selective Laser Sintering: A powder-bed process, most commonly associated with polymers, in which a laser selectively fuses each layer. |
| SME | Society of Manufacturing Engineers: A professional organization supporting manufacturing education, certification, technical knowledge, workforce development, and industry events. |
| SPC | Statistical Process Control: The use of statistical methods and control charts to distinguish normal process variation from signals requiring investigation or correction. |
| SPS | Spark Plasma Sintering: A rapid powder-consolidation technique that applies pressure and pulsed electrical current to achieve densification with relatively short thermal cycles. |
| SR | Stress Relief: A controlled thermal treatment used to reduce residual stresses and lower the risk of distortion, cracking, or instability during subsequent machining. |
| SS | Stainless Steel: A corrosion-resistant alloy family widely used as powder, wire, bar, and plate feedstock for industrial parts and tooling. |
| STEL | Short-Term Exposure Limit: The maximum allowable average workplace exposure to a substance over a brief specified period, commonly 15 minutes. |
| STEP | Standard for the Exchange of Product Model Data: The ISO 10303 family of neutral data standards used to transfer precise product geometry and associated engineering information. |
| STEP-NC | Standard for the Exchange of Product Model Data for Numerical Control: A feature- and process-oriented data model intended to support richer communication between design, planning, and machine control than conventional code. |
| STL | Stereolithography File Format: A widely used triangular-mesh format for transferring surface geometry to slicing and build-preparation software, but without native units or rich manufacturing metadata. |
| T | |
| TCM | Tool Condition Monitoring: The use of sensors, process signals, rules, or models to detect cutting-tool wear, damage, breakage, or remaining capability. |
| TCP | Tool Center Point: The programmed reference point at the cutting end of a tool whose position must follow the intended path during machining. |
| TCPC | Tool Center Point Control: A multi-axis control function that automatically coordinates linear and rotary motion to maintain the programmed tool-tip path. |
| TCS | Tool Coordinate System: A coordinate reference attached to the tool and used for offsets, orientation, path calculation, and robotic or multi-axis processing. |
| TD | Tap Density: The bulk density reached after a powder sample undergoes standardized mechanical tapping, supporting assessment of packing and flow behavior. |
| TEEP | Total Effective Equipment Performance: A capacity metric that extends equipment effectiveness to all calendar time, exposing losses from both scheduled and unscheduled nonproduction periods. |
| TGA | Thermogravimetric Analysis: A test that measures mass change as temperature or time varies, helping quantify moisture, binder content, degradation, oxidation, and residual material. |
| TIR | Total Indicated Runout: The full variation observed by an indicator as a surface rotates, used to assess spindle, holder, tool, or workpiece eccentricity. |
| TLM | Tool Life Management: The tracking and control of accumulated tool use, wear limits, replacement intervals, sister tools, and related production data. |
| TMA | Thermomechanical Analysis: A technique that measures dimensional change under controlled temperature and load to characterize expansion, softening, shrinkage, and transitions. |
| TO | Topology Optimization: A computational design method that distributes material within a defined space to meet performance targets and manufacturing constraints. |
| TPMS | Triply Periodic Minimal Surface: A mathematically defined, continuously curved periodic structure used for lightweight lattices, heat exchangers, energy absorption, and biomedical designs. |
| TPU | Thermoplastic Polyurethane: A flexible, abrasion-resistant thermoplastic used for printed seals, protective components, footwear, ducts, and compliant structures. |
| TSC | Through-Spindle Coolant: A system that routes cutting fluid through the spindle and tool to improve cooling, lubrication, and chip evacuation. |
| TWA | Time-Weighted Average: An average airborne exposure concentration calculated over a defined work period, commonly an eight-hour shift. |
| U | |
| UAM | Ultrasonic Additive Manufacturing: A sheet-lamination process that bonds metal foils through ultrasonic vibration and pressure at temperatures below bulk melting. |
| UEL | Upper Explosive Limit: The highest concentration of a flammable gas or vapor in air that can propagate combustion under specified conditions. |
| UKCA | United Kingdom Conformity Assessed: A product marking used for goods placed on the market in Great Britain where applicable legislation requires conformity assessment. |
| UL | Underwriters Laboratories: A safety-testing and certification name associated with product standards and certification marks used for industrial machinery and electrical equipment. |
| ULPA | Ultra-Low Particulate Air: A high-efficiency filtration classification used where very fine particulate control is required beyond typical general industrial filtration. |
| UPH | Units Per Hour: A throughput measure expressing the number of conforming units or completed cycles produced in one hour. |
| URS | User Requirements Specification: A controlled document defining what equipment or a production system must deliver in terms of functionality, capacity, quality, safety, and compliance. |
| USM | Ultrasonic Machining: A nontraditional process that uses high-frequency tool vibration and abrasive slurry to machine hard, brittle materials with low cutting force. |
| UT | Ultrasonic Testing: A nondestructive inspection method that uses high-frequency sound waves to identify internal discontinuities or measure material thickness. |
| UTS | Ultimate Tensile Strength: The maximum engineering stress sustained during a tensile test and a common qualification metric for printed and wrought materials. |
| UV | Ultraviolet: Electromagnetic radiation used to cure photopolymer resins, inks, adhesives, and coatings and requiring appropriate exposure controls. |
| V | |
| VDI | Verein Deutscher Ingenieure — Association of German Engineers: A German engineering organization whose technical guidelines address manufacturing, machine testing, surface measurement, safety, and production practices. |
| VDW | Verein Deutscher Werkzeugmaschinenfabriken — German Machine Tool Builders’ Association: An industry association representing German machine-tool manufacturers and supporting sector data, technology development, standards, and exhibitions. |
| VED | Volumetric Energy Density: A derived process metric combining beam power, scan speed, hatch spacing, and layer thickness to compare nominal energy input per unit volume. |
| VMC | Vertical Machining Center: A machining center with a vertically oriented spindle, widely used for milling, drilling, tapping, and contouring prismatic parts. |
| VOC | Volatile Organic Compound: An organic chemical that readily vaporizes and may require ventilation, exposure controls, or emissions management when using resins, solvents, coatings, or fluids. |
| VPP | Vat Photopolymerization: A standardized process category in which liquid photopolymer in a vat is selectively cured by light-activated polymerization. |
| VTL | Vertical Turret Lathe: A turning machine with a vertical workpiece axis, particularly suited to large, heavy, or short cylindrical components. |
| W | |
| WAAM | Wire Arc Additive Manufacturing: A directed-energy process that uses an electric arc and metal wire to deposit large structures or repair components at relatively high build rates. |
| WCS | Work Coordinate System: A programmable coordinate reference aligned to the workpiece, fixture, or build so geometry can be located independently of machine home coordinates. |
| WEDM | Wire Electrical Discharge Machining: A spark-erosion process using a continuously moving wire electrode to cut precise profiles in conductive materials and remove printed parts from build plates. |
| WOC | Width of Cut: The radial engagement of a cutting tool with the workpiece, affecting chip thickness, forces, heat generation, and machining stability. |
| WPS | Welding Procedure Specification: A controlled document defining essential variables and instructions for producing repeatable welds or qualified arc-based deposits. |
| WPQR | Welding Procedure Qualification Record: The documented evidence that a welding or arc-deposition procedure has met specified test and acceptance requirements. |
| X | |
| XCT | X-Ray Computed Tomography: A volumetric inspection method used to measure internal geometry and detect pores, inclusions, cracks, blocked channels, and assembly defects. |
| XPS | X-Ray Photoelectron Spectroscopy: A surface-analysis technique that measures elemental composition and chemical states in the outermost material layers. |
| XRD | X-Ray Diffraction: An analytical method used to identify crystalline phases, texture, lattice parameters, and residual stress in powders and finished materials. |
| XRF | X-Ray Fluorescence: A nondestructive technique for elemental analysis and alloy identification based on characteristic secondary X-rays emitted by a material. |
| Y | |
| YS | Yield Strength: The stress at which a material begins significant permanent deformation and a core mechanical-property requirement for structural components. |