How to Write a CNC RFQ That Gets Fast, Accurate Quotes

Many CNC quotes are delayed because the RFQ is incomplete. The buyer sends a CAD file and asks for pricing. The shop opens the file and immediately needs more information. What material is required? How many pieces are needed? Does the part need a finish? Are the tight tolerances real or just copied from a template? When does the buyer need the parts?

That back-and-forth slows everything down. The buyer feels the shop is taking too long. The shop feels the request is not ready to quote. Both sides lose time before the real conversation begins.

A good RFQ does not need to be complicated. It needs to tell the machine shop what the part is, how it should be made, and what matters most. The clearer the request, the faster the quote.

Start with the 3D file. For most machined parts, a proper CAD file is essential. A STEP file is usually useful because it gives the shop the part geometry in a clean format. A screenshot is not enough. A PDF alone is usually not enough either if the part has real shape or complexity.

Add a drawing when the details matter. The model shows the shape, but the drawing shows the requirements. This is where you should show threads, tolerances, surface finish, critical dimensions, and inspection notes. If the part does not need tight tolerances everywhere, do not ask for them everywhere.

Material should be clear. If you know the material, say it. If you are open to advice, say that too. A shop may be able to suggest a material that machines faster, costs less, or arrives sooner. That can be useful for early prototypes where the goal is to test the design rather than finalize production.

Quantity should be stated honestly. One part, five parts, and fifty parts are different jobs. Setup time and programming do not disappear just because the quantity is small. If you want to understand how price changes with quantity, ask for more than one quantity. That gives you better information for planning the next step.

Tolerances are often where RFQs go wrong. A founder may ask for very tight tolerances because accuracy feels safer. In reality, unnecessary tolerance can make the part more expensive and harder to quote. Tell the shop which features are critical. If a hole locates a bearing, explain that. If a surface aligns a sensor, mention it. If a cutout is only for clearance, it probably does not need the same level of control.

Finish should be included early. A raw machined part may be fine for testing. A part used outdoors, handled by customers, or shown in a demo may need a better finish. Finishing can affect price and lead time, especially if the shop uses an outside vendor for that step.

The deadline should be a real date. “ASAP” is not very helpful. If the part is needed for a test, demo, or assembly, give the date. Also say whether the date is flexible. A shop can make better scheduling decisions when the timeline is clear.

Inspection needs should match the part. Not every prototype needs a formal report. Some parts only need normal shop checks. Others need specific dimensions verified because they affect fit or function. If you need inspection documents, ask for them in the RFQ instead of adding the request after the quote.

Use-case context is one of the most useful things you can provide. A machine shop does not need the whole story of the product. It does need to know what the part does. A motor mount, a sensor bracket, a gripper finger, and a test fixture may all look like small machined parts, but they fail in different ways. A short explanation helps the shop understand the risk.

If the part is a revision, say what changed. Do not make the shop guess by comparing files. A simple note can save time. For example, you might say that the new version moves two mounting holes and increases wall thickness around one feature. That tells the shop where to look first.

A good CNC RFQ makes you look serious. It also helps the shop give a faster and more accurate quote. You do not need perfect manufacturing knowledge to send a good request. You need clear files, clear requirements, and enough context for the shop to understand the job.

The best RFQs reduce guessing. They tell the shop what to make, what material to use, how many parts are needed, when they are needed, and which details actually matter. That is usually the difference between a slow quote and a useful one.