This checklist helps a buyer prepare a CNC design for a useful supplier review. It is intentionally different from a general cost guide: the purpose is to identify missing decisions, conflicting requirements and questions that should be resolved before quotation or production.
1. What must the part do?
Write down the interfaces, loads, motion, sealing, appearance and service environment that the design must protect. Mark which features are safety-, fit- or performance-critical. Without this context, a supplier cannot distinguish a required feature from a cost-saving opportunity.
2. Is the current revision unambiguous?
Confirm that the 2D drawing, 3D model and specification refer to the same revision. Resolve conflicting dimensions, units, notes and material callouts. State which document governs if a conflict remains.
3. Can tools reach the features?
Review deep pockets, small internal radii, cross holes, undercuts, internal threads and long narrow passages. Ask whether a standard tool can reach the feature with a stable setup. If special tooling or EDM is expected, identify it rather than assuming a conventional milling operation.
4. How many orientations are required?
Highlight features on different faces and their datum relationships. A supplier can then assess whether the part needs several fixtures, multi-axis access or a revised sequence. Fewer setups may help, but only if equipment, workholding and inspection remain suitable.
5. Are tolerances tied to function?
Separate critical interfaces from general dimensions. Define datums, measurement condition and any geometric controls. Avoid copying the tightest value across unrelated features. The detailed design guide explains why selective tolerancing matters.
6. Is the material fully specified?
Include grade, temper or condition, standard and heat treatment. State whether alternatives are allowed and who can approve them. Check stock availability and whether the selected form creates avoidable waste.
7. What happens after machining?
List deburring, heat treatment, blasting, anodizing, plating, passivation, painting or assembly requirements. Show masked areas, cosmetic zones and final dimensions affected by the process.
8. What inspection evidence is required?
Name critical characteristics, sampling, report format, material records and any first-article package. Do not use a general quality certificate as a substitute for part-specific results; see the quality documents guide.
9. What is the real order pattern?
State prototype quantity, expected batch size, repeat frequency, packaging and delivery window. This helps the supplier choose between simple workholding, dedicated fixtures and a more developed production route.
Attach the completed inputs to the RFQ form. The resulting quotation should list assumptions, exclusions and open engineering questions.