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What you are actually paying for in a machined part price

July 10, 2026

Two shops quote the same drawing at 6.80 and 11.20 per piece. Neither is cheating. They are making different assumptions about five things, and once you know what those are, you can ask questions that close most of the gap.

1. Machine time

The dominant line on most parts. It is cycle time multiplied by an hourly rate, and cycle time is driven by:

• Material removed. Volume of chips, not size of part
• Material type. Aluminium cuts several times faster than stainless, which cuts faster than titanium
• The smallest tool in the job. A 2 mm corner radius forces a small cutter and the whole pocket slows down
• Finishing passes. Tolerance and surface finish decide how many
• Tool changes. Each one is seconds that multiply across a batch

The design lever here is geometry. The DFM checklist covers the specific features that cost the most time.

2. Setup and programming

One-off costs that get divided by your quantity. Programming, fixture design and build, first article, machine set. On a quantity of 10, setup can be half the price of every part. On 1,000 it disappears into the noise.

This is why quantity is the most important number in a request, and why the price at twice your quantity is the most useful second number to ask for.

3. Material

Two components that behave differently:

The metal itself. Priced per kilogram of stock bought, not of part delivered. A part machined from a solid block where 80 percent becomes chips is paying for all of it.

The form. Bar stock is cheaper to buy and to hold than plate. A part that can be made from standard bar is cheaper than one that needs a large block, even at the same finished weight.

Availability affects price indirectly through lead time. A grade that has to be imported ties up working capital and adds risk, and shops price that in.

4. Secondary operations

Everything that happens after the machine: deburring, heat treatment, grinding, finishing, assembly, marking. Most are subcontracted, which adds handling, freight between suppliers and a minimum batch charge from the finisher.

Small orders are hit hardest here. A finisher with a minimum lot charge will price your 30 pieces the same as 300.

5. Inspection and risk

The invisible line. A shop quoting a tight tolerance part includes:

• The measurement time per piece or per sample
• The cost of the pieces it expects to scrap
• The cost of a possible full batch failure, weighted by how likely that feels

This is why tolerance is such a powerful lever and why a blanket tight tolerance is the most expensive thing on a drawing. It does not just add inspection. It adds fear, and fear is priced.

Where each lever actually lives

Lever	Who controls it	Typical effect
Corner radii and pocket depth	You	Large on complex parts
Tolerance scheme	You	Large
Quantity and repeat commitment	You	Very large
Material grade and form	Shared	Moderate
Finishing spec	You	Moderate
Machine choice and process	The shop	Moderate
Hourly rate	The shop	Less than buyers assume

Four of the top five are yours. Negotiating the hourly rate is the least effective thing you can do, which is why experienced buyers spend their time on the drawing instead.

Three questions that move the number

1. “What would you change on this drawing to make it cheaper?” The answer is free DFM and a test of how carefully the shop read your part.
2. “What is the price at twice the quantity?” It tells you how much of the price is setup, which tells you whether to order more now.
3. “Which single feature costs the most time?” Most parts have one. Often it is a corner radius or a tolerance that nobody has questioned since the part was designed.

A worked example

Take a 6061 bracket, 180 x 90 x 40 mm, features on two faces, four toleranced bores, bead blasted, at 250 pieces. A plausible build-up looks like this:

Line	Share of the unit price
Material, including the part that becomes chips	15 to 25 percent
Machine time, both operations	40 to 50 percent
Setup, programming and fixture, spread over 250	8 to 15 percent
Deburr and bead blast	5 to 10 percent
Inspection	3 to 8 percent
Margin and risk	the rest

Change one thing and watch which line moves. Drop the quantity to 25 and the setup share can triple. Switch to stainless and the machine time line grows while everything else stays put. Tighten the bores from ±0.05 to ±0.01 mm and inspection plus risk can double.

That is the whole point of the breakdown. It tells you which change is worth arguing for.

Where buyers waste their leverage

Three common moves that do not work:

• Pushing on the hourly rate. It is the least flexible number in the quote and the one the shop defends hardest.
• Asking every shop for their best price without changing anything. You get a small discount and a shop that starts looking for something to cut.
• Splitting a small order across two suppliers to create competition. You now pay two setups for the same part.

The moves that do work are all upstream: quantity, tolerance, geometry and giving the shop enough information to stop pricing uncertainty.

Once the quotes come back, the guide on comparing three quotes covers how to normalise them. When you are ready for prices on your own part, send the drawing.

Questions we get on this

Keep reading

• What machining in Vietnam actually costs, and where the saving goes
• Minimum order quantity in machining, and why it is really a value