What Makes “Precision Machining” Different from Standard CNC?

Quick answer: Precision machining differs from standard CNC machining mainly in the level of accuracy and dimensional control it provides. With standard CNC machining, your part will be made with tolerances around ±0.125 mm (±0.005 in). Precision CNC machining can achieve around ±0.025 mm (±0.001 in) or tighter, so it lets you achieve parts with critical dimensions and strict fit or performance requirements.

HLH Prototypes produces high-precision CNC-machined parts with fast turnaround times. Our team can also review your design and suggest changes that make the part easier and more practical to machine in China.

It’s easy to think precision machining in China and standard CNC machining mean the same thing. They certainly overlap, but take a closer look and you’ll see how different they are in terms of how much accuracy and control your part requires.

For a general component, standard CNC machining may give you all the accuracy you need. But when you’re making parts for applications such as medical devices or aerospace equipment, even a small dimensional difference can affect fit and performance. In those cases, ‘close enough’ may not be good enough.

What precision CNC machining means

CNC machining makes your part using computer-controlled equipment to remove material according to programmed instructions. This allows the machine to produce highly accurate dimensions and repeat them across multiple parts.

With precision machining in China, the manufacturer follows tighter tolerances so they can produce your part as close to your design.

Here’s how it generally compares with standard CNC machining:

Comparison	Standard CNC machining	Precision CNC machining
Typical tolerance	Around ±0.125 mm (±0.005 in)	Around ±0.025 mm (±0.001 in) or tighter
Very tight tolerances	Usually unnecessary for general parts	Around ±0.005 to 0.013 mm (±0.0002 to 0.0005 in) for certain features and processes
Accuracy requirements	Standard dimensional requirements	Critical dimensions requiring tighter control

Here at HLH Prototypes, we machine parts to very fine tolerances and conform to ISO 2768-1.

Those tighter tolerances can also make assembly easier. When components already fit correctly, your team can spend less time making adjustments or adding shims. This can reduce labor costs and keep your production moving.

Achieves complex geometries

Precision machining in China gives you more freedom when designing complicated parts. 5-axis CNC machining can make complex part geometries that would be hard or impractical to produce manually. Because the machine can reach the part from multiple angles, you may not need to simplify the design just to make it manufacturable.

Precision machining minimizes material waste

Precision CNC equipment follows programmed tool paths and removes material only where necessary. That helps your manufacturer make better use of the original stock and reduce unnecessary waste.

If the machining process stays consistent and the manufacturer checks parts as they are produced, defects are also less likely to spread through the whole batch.

Get quality parts with faster turnaround

Precision machining in China can make it easier to move between jobs without relying on lengthy manual setup procedures. So, you can do smaller production runs and save more money and time without the complicated setup.

This speed can be especially useful when you’re developing prototypes.

HLH is perfectly suited to providing an ultra-quick turnaround for prototypes or low-volume product runs, so your engineering team can test sooner and revise faster when necessary.

More materials available

You’ll also appreciate how precision machining in China gives you access to a wider selection of materials. Depending on your project and the equipment, we can machine your part in any metal or plastic.

This gives you more freedom to choose your material based on how the finished part needs to perform. For example, an aerospace bracket may have very different strength and weight requirements from a medical fitting.

Get precise CNC-machined parts

Leave your precision machining in China to us here at HLH Prototypes, and we’ll work with your specifications to produce the parts you need while keeping turnaround times and costs in mind.

Not sure what your project requires yet? Contact us now with your drawings and other project details to get a free project review, so we can help you determine the next steps.