Define the service you need
A custom machining prototype service can mean different things to different buyers. State whether the request is for machining parts to released files, a manufacturability review, inspection records, or secondary finishing. Jucheng provides machining services for customer parts and does not sell equipment.
Provide the controlled design package
Include the drawing and model, part number, revision, material, quantity, units, and finish. Identify functional features and the question the prototype should help evaluate. If the design is still changing, state which features are approved and which remain under review.
Agree what the service includes
Confirm the machining operations, secondary work, inspection, documentation, packaging, and delivery included in the quote. Ask the supplier to list assumptions and exclusions. A design change or substitute material requires approval and a revised scope.
Set expectations for schedule and feedback
Provide a target date and obtain confirmation for the actual part, quantity, material, and current workload. Define who will review the prototype, how results will be recorded, and how a revised build will be requested.
Keep the next stage separate
Prototype terms do not automatically define repeat production. If a follow-up order is planned, request a separate scope for quantity, acceptance criteria, records, packaging, and schedule.