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CNC Small Part Machining Process: Precision for Miniature Components

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Update time : 2026-05-16

What Makes CNC Small Part Machining Different

I tell clients all the time — small parts are not just big parts scaled down. They come with their own set of headaches. At AOOM Technology, we've been running small part jobs for over a decade, and we know exactly where things go wrong.

CNC machining small precision parts on a 5-axis machine tool at AOOM Technology

The Real Challenge With Tiny Parts

Heat builds up fast when you're cutting small features. The tool-to-part ratio is completely different. A .5mm end mill heats up in seconds if your feeds are wrong. We see this in our shop every week — engineers send us designs that look great on screen but require impossible tool access.

Fixturing is another beast. You can't just clamp a 10mm part the same way you clamp a 200mm block. We use custom vacuum fixtures and specialized soft jaws for every micro-component run. It adds setup time, but it's the only way to hold ±.005mm.

Our Process From CAD to Shipment

First, we run a DFM check on every incoming file. We look for thin walls, deep cavities, and sharp internal corners. If something won't work, we tell you before we cut metal — not after.

Next comes toolpath strategy. For small parts, we use trochoidal milling to spread thermal load. High-speed machining at 40,000+ RPM with small stepovers keeps the tool cool and the surface finish tight.

Inspection happens on every part — not every batch. Our CMM and optical comparators catch deviations before they become scrap.

Automated CMM inspection of micro-machined small components for dimensional verification

Materials We Machine for Small Parts

We run aluminum 6061 and 7075 daily for small enclosures and brackets. For medical work, it's titanium grade 5 and stainless 316L. Engineering plastics like PEEK and Ultem show up often too. Each material demands different speeds, feeds, and coolant strategies.

A client recently sent us a titanium bracket that weighed 8 grams. They were getting 60% scrap rates from their previous supplier. We dialed in the feeds and dropped scrap below 3% on the first run.

Why Real Experience Matters

Anyone can buy a 5-axis machine. Running it profitably on micro-parts takes years of trial and error. Our machinists average 12 years on the floor. When they say a feature needs redesigning, listen.

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

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