Technical Reference
CNC Machining Glossary for Engineers and Buyers
This glossary defines common quotation, machining, tolerance, finishing and quality terms in the context of custom CNC parts. Definitions support communication but do not replace the governing drawing, standard or contract.
A–D
- As machined
- Part condition after machining, cleaning and agreed deburring without added coating.
- CAD
- Computer-aided design data used to define geometry.
- CAM
- Software/process used to create machining toolpaths from geometry.
- CMM
- Coordinate measuring machine used for selected geometry and datum-related inspection.
- Datum
- Theoretical reference derived from a feature and used to establish measurement or manufacturing coordinates.
- DFM
- Design for manufacturability review of geometry, material, tolerance, process and cost risk.
F–M
- FAI
- First article inspection used to verify an initial setup or production result.
- GD&T
- Geometric dimensioning and tolerancing system for controlling feature form, orientation and location.
- Heat/lot traceability
- Link between parts and an identified material batch or production lot.
- Incoterms
- International trade terms allocating delivery, cost and risk responsibilities.
- MMC
- Maximum material condition for a feature of size, sometimes used with GD&T bonus tolerance.
- MTC
- Mill Test Certificate containing material batch information and reported properties.
N–R
- NCR
- Nonconformance report documenting a requirement that was not met.
- PPAP
- Production Part Approval Process, a project-specific automotive/customer submission system.
- PMI
- Positive material identification used to help verify alloy composition.
- Ra
- Arithmetic average roughness; one parameter that does not fully describe surface function or appearance.
- RFQ
- Request for quotation containing geometry, specifications, quantity, quality and delivery requirements.
- Runout
- Variation of a rotating surface relative to a datum axis.
S–Z
- Sampling inspection
- Inspection of a defined subset according to an agreed plan.
- Setup
- Machine, fixture, tool and datum arrangement used to manufacture features.
- Traceability
- Ability to link material, process, inspection and shipment records to the part or batch.
- Workholding
- Fixture, chuck, jaw or other method used to locate and secure the part.
- XRF
- X-ray fluorescence method for elemental composition screening, with material-identification limitations.
Use the Governing Standard
Terms such as “precision,” “full inspection,” “medical grade” or “aerospace quality” are too vague unless tied to measurable requirements and verified certifications.
From CNC Machining Glossary for Engineers and Buyers Requirements to a Controlled Manufacturing Plan
The purchasing issue behind CNC Machining Glossary for Engineers and Buyers is that buyers can overpay or lose datum consistency when a process is chosen from a machine label instead of the part geometry; as a result, unnecessary setups or an unjustified high-end route can add cost without improving the functional result. Our response is to compares rotational versus prismatic geometry, feature access, datum relationships, workholding, batch size and measurement access before selecting milling, turning or a combined route. The objective is to protect assembly and validation schedules while reducing preventable scrap, rework and supplier-change risk.
For the CNC Machining Glossary for Engineers and Buyers buying decision, before we confirm price or delivery, the buyer should send the 2D drawing and 3D model, overall size, material state, critical datums and tolerances, quantity, finish and inspection documents. If a requirement cannot yet be verified, we keep it as an open condition instead of presenting it as a guaranteed result.
Confirm the Process for CNC Machining Glossary for Engineers and Buyers
For CNC Machining Glossary for Engineers and Buyers, submit the 2D drawing and 3D model with matching revision, exact material and condition, quantity and repeat demand. Identify relevant datums, critical tolerances, GD&T, threads, difficult-access geometry, thin walls, roughness, heat treatment and finish requirements.
The route for CNC Machining Glossary for Engineers and Buyers may require multiple setups, dedicated workholding, intermediate inspection or a justified secondary process. Select grinding, EDM, stress relief or post-finish verification only when the geometry and function require it; machine axis count alone does not establish final capability.
Need a Term Applied to Your Drawing?
Send the drawing and standard so the project team can confirm its manufacturing meaning.