How to Send Drawings for Custom CNC Machined Parts

For custom CNC machined parts, clear drawings and complete project information help the supplier understand the required material, dimensions, tolerance, surface finish, quantity and application. Better information usually leads to faster quotation and fewer production mistakes.

1. Recommended Drawing Files

For quotation, buyers can send PDF drawings, DWG, DXF, STEP, STP, IGS, IGES or STL files. PDF drawings are useful for checking dimensions and tolerance, while 3D files are helpful for reviewing structure, machining difficulty and assembly details.

2. What to Mark on the Drawing

The drawing should show material, key dimensions, tolerance, thread requirements, surface treatment, quantity and any important functional areas. If a dimension is important for assembly or sealing, it should be marked clearly.

3. What to Do If No Drawing Is Available

If the buyer only has a sample part, clear photos can be sent first. Photos should show the front, back, side, holes, threads and important details. It is also helpful to include rough dimensions with a ruler or caliper.

4. Application Information Helps Quotation

The supplier can give better suggestions when the application is clear. For example, a shaft used in machinery, a stainless steel fitting used in plumbing, or an aluminum bracket used in a vehicle may need different material, tolerance and finishing choices.

5. Before Production Starts

Before production, the buyer should confirm the final drawing version, material, quantity, surface treatment, inspection requirements, packaging and delivery address. Written confirmation is important for custom parts.

Useful Links for Buyers

You can browse CNC machined parts, CNC turned parts, CNC milled parts, or submit files through the RFQ page.