Drawing requirements
Define geometry, datums and critical dimensions
Review the right CNC process for the geometry in your drawing.
Explore milling, turning, material decisions, drawings and inspection requirements.
How does CNC machining turn drawings into geometry?
Toolpath and workholding
Review access, fixtures and setups
Acceptance criteria
Check results against drawing revisions
When is milling or turning appropriate?
PROCESS 01 / CNC MILLING
CNC milling / machining center
A rotating tool cuts a secured workpiece. Useful for understanding flat faces, cavities, slots, holes, brackets and housings.
PROCESS 02 / CNC TURNING
CNC turning / lathe
A rotating workpiece meets a cutting tool to form outside and inside diameters, shoulders and grooves in rotational components.
Machinability begins with the part, not the machine label.
Internal fillets
Relate corner radii to tool diameter
Deep pockets
Evaluate tool overhang and cutting stability
Wall thickness
Consider deflection and clamping
Functional datums
Identify geometric and dimensional references
Choose material together with function and finish.
ALUMINUM · EXAMPLE
Aluminum alloys
Consider mass, stiffness and finishing
STAINLESS · EXAMPLE
Stainless steels
Consider corrosion and machinability
STEEL · EXAMPLE
Carbon and alloy steels
Consider strength, heat treatment and finish
OTHER · EXAMPLE
Copper alloys and engineering plastics
Consider conductivity, wear and dimensional response
Machining limits must be stated with operating conditions.
01
Process and machine axes
Milling/turning, configurations and outside operations
02
Part dimensions
Travel, fixtures and stock limits
03
Dimensional tolerances
Feature requirements and measurement method
04
Volumes and prototypes
MOQ and production feasibility
05
Finishing and timing
Ownership, checks and workable schedule
Manufacturability review makes the drawing clearer to produce.
01
Tool access
Identify blind holes, deep features and undercuts
02
Tolerance priority
Differentiate functional from noncritical dimensions
03
Material and finish
Review the effect of heat treatment and coatings
04
Inspection method
Establish datums and measurable acceptance checks
What usually changes machining cost?
Material
Grade, raw stock size and sourcing
Machining
Setup count, toolpaths and cutting time
Inspection
Critical tolerances and verification complexity
Quantity and schedule
Batch volume, finish, timing and shipping
What should a buyer prepare for a feasibility discussion?
01
Current 2D drawing and/or 3D model revision
02
Part name, function and assembly context
03
Material grade or request for advice
04
Quantity, timing and operating environment
05
Critical dimensions, tolerances and surface requirements
06
Finishes and required inspection documents
This site does not accept customer drawing uploads.
From drawing discussion to acceptance criteria.
- 01
Requirements
Drawings, material, quantity and needs
- 02
Feasibility
Process, access, fixtures and production ownership
- 03
Agreement
Commercial terms, limits, inspection and timing
- 04
Quality review
Drawing revisions, checks and issue ownership
Precision needs evidence, measurement and accountability.
Frequently asked CNC machining questions
How do CNC and machining centers differ?
CNC is the broader numerical-control concept; a machining center typically refers to a milling-oriented machine with automated tool selection.
Can a 2D PDF be enough to begin?
A 2D drawing can communicate key dimensions, while a 3D model helps explain complex shapes and assemblies.
What are minimum volumes and lead times?
Compare expected quantity, material sourcing, finishing and target delivery assumptions when requesting a quote.
Are tight tolerances or inspection reports guaranteed?
Review functional tolerances, measurement methods and inspection documentation for each drawing and manufacturing process.