How to compare CNC machining quotations beyond unit price
A practical quotation comparison covering scope, assumptions, delivery and quality documentation.
Use one revision and one requirement list
Before comparing prices, check that every supplier received the same drawing revision, model, quantity and finish specification. Record unanswered questions. A quote that excludes an unresolved feature should not be treated as equivalent to a quote that includes it.
Separate one-time costs from recurring costs
Ask suppliers to distinguish setup or dedicated fixtures from the price of each part. Confirm whether these charges return on a repeat order, who retains any dedicated tooling, and what changes would trigger another setup charge. Compare the total for the quantity you actually plan to buy.
Make assumptions visible
List proposed material substitutions, excluded surface treatments, subcontracted operations and inspection deliverables. Ask for confirmation of any assumption affecting function. An alternative can be useful, but it needs a clearly defined approval step rather than being silently substituted.
Check delivery and inspection together
A promised completion date may refer to machining only. Confirm whether finishing, final inspection and packing are included in the schedule, and distinguish dispatch from arrival. Specify which dimensions require results in an inspection report and how nonconforming parts will be discussed.
Build a simple comparison sheet
Use columns for supplier, revision, quantity, unit price, one-time charges, included finishing, inspection scope, lead-time basis, freight and open questions. Mark unknown items as unresolved. Henry CNC can help clarify these items with prospective suppliers; manufacturing and project commitments are confirmed separately for each order.