Why CNC Quotes Vary So Much Between Shops
Why CNC quotes vary between shops for one part: tooling on hand, setups, how busy the shop is, and who wrote the quote. How to compare them line by line.
Send one drawing to three shops and you can get three numbers that don't look like they came from the same part. Knowing why CNC quotes vary makes it a lot easier to tell a fair quote from a lucky one.
Why Do Three Machine Shops Quote the Same Part So Differently?
Because each shop is pricing its own machines, tools, schedule and appetite for the job, not some fixed market price for your part.
An r/engineering poster asked this after years of sending one-off parts to three local shops. All three did good work, but one quote was regularly double another, and any of them could be the high one that time. Same material, same local labor pool. Take a deep hole as the classic example: a 1.5" wide, 6" deep hole in 4140. A shop with a through-spindle coolant drill makes it in minutes. A shop without one is pecking and babysitting it, and the quote shows that.
The usual reasons will sound familiar to anyone who has quoted work:
- Tooling and machines on hand. Shops with the right holder, drill or machine already in the building don't price in buying it.
- Who wrote the quote. Two estimators in the same shop can guess cycle time differently.
- Workload. A full shop prices high because it doesn't need the job. Some quotes are a polite no.
This isn't new or small. Modern Machine Shop's 10 Reasons Why Machine Shops Vary So Much in Quoted Pricing cites MakeTime research finding "a factor-of-10 discrepancy in quoted prices for identical machining work," and lists capacity among the causes: busy shops bid higher.
If That's Why CNC Quotes Vary, How Do You Compare Them?
Compare the parts of the price, not just the total. Ask each shop to split out setup and programming, material, machining time and anything the drawing triggered, like tight tolerances or special tooling.
That's how we build ours. Our CNC quote is built from the part's real geometry: stock and material rate, setup and programming, machining time, then each detected feature. "Hard-to-machine features carry a surcharge that reflects the extra cycle time they actually cause, not a penalty. The quote itemises all of it." Tighter tolerances show up as their own uplift, and an engineer reviews every quote before it goes into production.
When one quote is way off from the others, look for the line that's different. It's usually one feature: a deep hole, a tight tolerance callout, or an undercut that one shop can reach easily and another can't.
For what moves the total once the shop is chosen, see what actually drives the cost of a CNC quote besides material.
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