What to Include in a CNC Drawing

A good drawing tells the supplier what matters. CAD files describe shape, but drawings define tolerances, finish, material, threads, inspection, and acceptance requirements.

Essential items

• Part name, revision, and units
• Material and material condition
• Critical dimensions and tolerances
• Thread specifications and hole depths
• Surface finish and post-processing
• Deburr, edge break, and cleanliness notes
• Inspection or certificate requirements

Avoid ambiguity

Unclear drawings lead suppliers to ask questions or add risk to the quote. Clear notes usually speed up quoting and reduce surprises.