What Does Small-Batch CNC Machining Actually Cost?

I get this question every week. A client needs fifty custom brackets or a hundred connector housings. They send me a quick sketch and ask for a number. I can't give them one — not without seeing the full drawing.

Here's the honest range: for most small-batch custom hardware parts, expect $50 to $500 per part. Sometimes more for complex items. That wide spread isn't a trick. It's because the final cost depends on four specific things. Let me walk you through them.

Factor One: The Material You Pick

This is your starting point. Aluminum 6061 machines fast and easy. Titanium? Completely different story. It's not just the raw material price per kilo. Harder materials eat tools, run slower, and take more machine time.

I tell clients: check the machinability rating before you decide. A 20% cheaper material that's harder to cut can cost you 35% more in production time. We see this in our shop regularly.

Factor Two: Part Complexity

A flat bracket with four holes is quick. A part with deep pockets, tight corners, and threaded holes on five faces? That takes multiple setups and careful toolpath planning.

The geometry directly drives machine time, and machine time is what you're really paying for. I've quoted simple parts at $80 each and complex ones at $400 for the same material and quantity.

Factor Three: Batch Size

This is where small-batch gets interesting. The setup cost — programming, fixturing, tool selection — is fixed. Spread that over 10 parts and each one carries a heavy share. Spread it over 100 and the per-part price drops noticeably.

I always recommend clients order as close to their full run as their budget allows. The price break between 50 and 100 units is often bigger than people expect.

Factor Four: Surface Finish and Post-Processing

Basic milled finish is usually included. But anodizing, sandblasting, plating? Those add real cost. I had a client once who needed electropolishing on every part. Added almost 30% to the total bill.

Ask your supplier what's included in the base price. Some shops quote a bare part and add every finish as an extra. Others bundle it. Know the difference.

A Real-World Example

Let me make this practical. Say you need an aluminum mounting plate, fifty pieces.

Simple design, two to three hours machine time per part: roughly $80 to $150 each.

Complex design with tight tolerances, five to eight hours per part: $250 to $400 each.

Same material. Same quantity. Triple the price. That's what complexity does.

How to Get a Real Quote, Not a Guesstimate

You can't get an accurate number by asking "how much." You need to send a proper CAD file with dimensions, tolerances, material spec, surface finish requirements, and exact quantity.

With that information, a real machine shop can calculate actual machine time and material. Without it, we're guessing. And guesses are always wrong.

Send your CAD files to chen@aoomtech.com for a quote within 24 hours.