Control the technical definition
Share a revision-controlled drawing and, where useful, a matching 3D model. State which file governs if there is a conflict. Dimensions should be complete enough to manufacture and inspect without guessing design intent.
- Drawing number and revision
- Units and projection
- General tolerances
- Critical-to-function dimensions
Specify material and condition
Name the exact grade, form and condition where they affect machining or performance. If alternates are acceptable, define the approval path rather than leaving substitution open-ended.
Use tolerances deliberately
Apply tight tolerances to functional features, not every dimension. Unnecessary precision can change machine choice, cycle time, inspection effort and cost without improving the product.
- Datum structure
- Fits and interfaces
- Geometric tolerances
- Surface finish
Define quantity, finish and inspection
Separate prototype quantity from expected repeat demand, state any surface treatment and explain what inspection evidence should accompany delivery. Include packaging needs for delicate finishes or sharp features.