Why the Quote Is Higher Than You Expected
Every week we get RFQs where the buyer has a number in their head, and every week the gap between that number and the quote comes down to the same five things: material, machine time, setup, tolerance, and quantity. None of them is a mystery. Once you see how a quote is built, you can design and spec parts that quote lower — and you will know exactly what to ask a supplier to justify a number.
Material: The Floor of the Quote
Material is usually 15-40% of the part price. Aluminum 6061 is cheap; 7075, stainless 316, titanium and copper alloys climb fast. Small quantities pay for material from the minimum bar or plate purchase, so an exotic alloy on a 10-piece run hits hard. If the drawing over-specifies material (7075 where 6061 works), the quote carries the penalty all the way through.
Machine Time: Where the Money Lives
Machine time is the biggest line on most quotes. It splits into two kinds: cutting time, which depends on part complexity, and setup time, which depends on how many operations and fixtures the part needs. A part that needs one operation in a 5-axis machine prices very differently from the same part needing three setups on three machines. Every feature that forces a new setup — a back-side feature, a fifth-axis angle, a second chucking — adds real money.
Tolerance and Surface Finish: Paying for Precision
Tight tolerances cost in three places: slower machining, more inspection, and more scrap risk. A general tolerance part (0.1 mm) machines fast and gets a spot check. A ±0.005 mm critical dimension means careful finishing passes, CMM inspection, and a higher risk of losing parts — all priced in. Surface finish works the same way: Ra 1.6 is free, Ra 0.4 needs grinding or fine finishing. Spec precision where the assembly uses it, and the quote drops.
| Cost Driver | Cheap Version | Expensive Version | Impact |
|---|---|---|---|
| Material | 6061 / 1045 / 12L14 | Titanium / 316L / 7075 | 15-40% of price |
| Complexity | 2.5-axis, one setup | 5-axis, multiple ops | Machine time |
| Tolerance | ±0.1 mm general | ±0.005 mm critical | Inspection + scrap risk |
| Finish | Ra 1.6 machined | Ra 0.4 ground | Extra process |
| Quantity | 500+ pcs | 1-20 pcs | Setup amortization |
Quantity Changes Everything
Setup and programming cost the same for 1 piece or 1,000. Spread across 10 pieces they dominate the price; spread across 500 they nearly vanish. This is why the per-piece number on small batches shocks buyers — it is not a penalty, it is division. If your real volume is 200 parts a year, say so. We quote against the annual picture, and the price per piece for a combined prototype-plus-production agreement is often far better than one-off pricing.
How to Get the Best Quote
A complete RFQ gets the best number: full drawing with GD&T, material grade and condition, quantity and expected annual volume, surface finish requirements, and any special processes. What kills pricing speed: missing material spec, unmarked critical tolerances, and drawings that leave the shop guessing. And ask the supplier what drives the price on your part — a good shop will tell you exactly where the money is, and usually where to cut it.
Send us your drawing and we will return a quote with the cost breakdown and DFM notes — you will see exactly what drives your price, and how to lower it.
The Quote Is a Conversation, Not a Verdict
A good machining quote is the start of a dialogue, not a take-it-or-leave-it number. If the price is higher than your target, ask where the money goes — the answer is usually one line you can act on: loosen this tolerance, change this material, combine these variants into one program. Shops that explain their numbers are shops that can work with you to hit a target. Shops that only defend them are quoting by formula. You want the first kind.
Frequently Asked Questions
What is the biggest factor in CNC machining cost?
Machine time — cutting time plus the number of setups. Complexity that forces extra setups or five-axis work drives cost more than almost anything else.
Why are prototype quantities so expensive per piece?
Setup, programming and first-article inspection cost the same for 1 or 1,000 pieces. On small batches those fixed costs are divided by few parts.
Do tighter tolerances really increase price?
Yes — slower machining, more inspection and higher scrap risk. Spec ±0.005 mm only where the assembly needs it; general tolerances quote significantly lower.
How much does material choice affect the quote?
Material is typically 15-40% of part price. Exotic alloys on small runs are especially expensive because you pay for the minimum stock purchase.
What information makes quotes faster and cheaper?
A complete drawing with GD&T, material grade, quantity and annual volume, surface finish specs, and special process requirements. Missing info forces conservative padding.