Key takeaways
- Mark critical dimensions; do not default everything to ultra-tight tolerances
- Ask what inspection is included
- Surface finish and secondary ops change both cost and lead time
- Quantity bands matter even without traditional “tooling”
Files that help shops quote quickly
STEP models plus a PDF drawing for critical dims is a strong default. Native CAD can help but is not always required.
Say which faces are cosmetic. Say which holes are threads versus clearance.
Tolerances and finishes
Tighter than needed multiplies cost. Use general tolerances where possible and tighten only interfaces that matter.
Deburring, anodising, powder coat, and plating should be listed as line items or clearly included.
Prototype versus repeating production
One-off programming and fixturing dominate prototype cost. Repeat batches can reuse setups. Tell the shop if this is a one-off or a recurring part.
If you expect the design to change after the first five parts, say so — the quoting strategy should stay flexible.
Reading machine-shop quotes
Check material certification needs, lead time start point, scrap policy, and whether assembly/kitting is included.
Use Combinate to collect bids against one RFQ pack. You evaluate capability; Combinate does not verify machine shops.
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Disclaimer: This guide is general information for businesses. It is not legal, regulatory, or financial advice. Combinate does not verify or certify manufacturers.