Plan a Custom Machining Project from the Part Definition
Custom machining services are used when a part must follow a specific drawing, interface, or design requirement rather than a standard catalog specification. For a China custom machining services RFQ, the most useful starting point is a clear definition of what must be made, what can vary, and how the finished part will be accepted.
Describe the Part and Its Use
Provide the part number, current drawing revision, material, finish, quantity, and destination. Explain which surfaces mate with other components and which dimensions affect function. Add a 3D model when it clarifies geometry, and use the drawing to define dimensions, datums, tolerances, threads, and finish requirements.
Identify Open Design Questions
- Mark features that may affect tool access, workholding, or setup.
- Identify details that are provisional, such as material or finish choices.
- Ask for drawing questions before finalizing the quote.
- Record approved changes in a new revision and retire outdated files.
- Define the inspection records needed for acceptance.
The route should be selected for the actual part. Review the siteâs объёмом услуг ЧПУ-обработки and request clarification on how the requested geometry and material will be handled.
Keep a Custom Quote Comparable
Ask the supplier to separate setup charges from unit price and list included machining, finishing, inspection, packaging, and shipping. If several design options are under consideration, request them as separate quote lines so the effect of each choice can be reviewed. State the quantity and drawing revision for each option.
For a part-specific procurement checklist, see custom machined parts sourcing.
Часто задаваемые вопросы
What should a custom machining RFQ include?
Include a current drawing, CAD model when useful, material, finish, quantities, critical dimensions, destination, inspection requirements, and revision.
Can I ask a supplier to review a design before quoting?
Yes. Identify the questions you want reviewed and ask the supplier to document any assumptions or proposed changes. Approve design changes through a controlled revision.
How should multiple design options be quoted?
List each option separately with its drawing revision, material, finish, and quantity so the differences are clear.
What if material or finish is undecided?
Label it as open and ask for separate options if needed. Do not compare quotes until each supplier uses the same assumption.
How can I control custom part revisions?
Use a part number and revision on each drawing, quote, and purchase document. Replace obsolete files explicitly when requirements change.