What to Send a CNC Machine Shop for a Faster, More Accurate Quote

A CNC quote does not have to be a 20-email conversation.

The more useful information you send up front, the less guessing the manufacturer has to do.

For most custom CNC parts, start with these six items.

A STEP or STP file is usually the easiest starting point for reviewing geometry.

It shows the actual part shape and helps the machine shop understand:

• pockets
• holes
• slots
• wall thickness
• curved surfaces
• mounting features

A drawing should cover the details that the 3D model does not clearly define.

Especially:

• critical dimensions
• tolerances
• threads
• datums
• surface finish
• special inspection requirements

Don't just write:

Aluminum

Give the actual grade when it is important.

For example:

6061-T6

or another grade required by your design.

Material grade and temper can affect machinability, mechanical properties, finish, and cost.

One prototype and 500 production parts are two very different jobs.

Tell the supplier whether you need:

1 pc
5 pcs
50 pcs
500 pcs

Also mention expected repeat orders when relevant.

Tell the supplier what you actually need:

• as machined
• anodizing
• polishing
• sandblasting
• other specified finish

Also identify cosmetic surfaces when appearance matters.

If a 6 mm hole must locate a bearing precisely, say so.

If a mounting surface needs controlled flatness, say so.

If a thread must remain clean after anodizing, say so.

Don't make the supplier play detective.

A complete RFQ lets the supplier focus on making the part instead of chasing missing information.

Ready to get a quote? Click here on the right to contact me.