Find a high-quality precision parts CNC machining factory. Three coordinate inspection is not a bonus, but a mandatory option!

When looking for a reliable precision parts CNC machining factory, many people's first reaction is to look at equipment, cases, and prices. But there is a key ability that is often overlooked - coordinate detection. Many purchases only consider it as a bonus, but practical experience tells us that in order to do precision machining well, coordinate measuring is often a necessary support item. This article focuses on the necessity of three-dimensional detection, differences in equipment selection, applicability, and supplier evaluation methods to help you understand why this ability cannot be saved.

1、 Why is three coordinate detection a "must-have" for precision CNC machining of parts

1. Traditional measuring tools cannot cover complex geometric features

Calipers only measure length and width, while micrometers only measure outer diameter - but traditional measuring tools cannot measure the positional tolerances such as coaxiality, perpendicularity, position, and contour on precision parts.

For example, a robot joint housing requires the coaxiality and positional accuracy of the bearing holes to be within a few wires. This spatial relationship cannot be measured with calipers, only CMM can collect spatial point cloud data through probes, compare it with 3D models, and output qualified inspection reports.

2. Customers are increasingly valuing their testing capabilities during factory inspections

Nowadays, more and more party A directly lists "whether there is coordinate measuring equipment" as the entry threshold during supplier audits. A processing factory without CMM cannot even get the opportunity to quote.

The reason is simple: Party A needs to see the measured data, not just verbal promises like 'we have high processing accuracy'. The inspection report issued by CMM is a traceable certificate of machining quality.

3. Batch consistency must rely on data to speak for itself

During the sampling stage, the quality can be controlled by the experience of the master, but once mass production begins, factors such as tool wear, temperature fluctuations in the workshop, and thermal deformation of the machine tool after long-term operation can cause the accuracy to quietly shift. Three coordinate inspection can cover key dimensions piece by piece or randomly inspect them in batches to ensure consistency of each batch of parts.

Batch delivery without data support is essentially a gamble on probability.

2、 What is the difference between Zeiss coordinate system and regular coordinate system?

There are many brands of three coordinate equipment, but ZEISS's position in the industry is equivalent to that of an imported five axis in the CNC field - it is a leading brand.

For precision machining plants, choosing high-end CMM such as Zeiss is not only to meet the testing needs of high-precision parts, but also to establish quality trust in customer audits. Different brands of equipment have their own positioning, and the key is whether the detection capability matches the accuracy requirements of the parts.

3、 Which precision parts are preferred for three coordinate testing?

Not all CNC machined parts require a three coordinate system - that would increase unnecessary costs. However, CMM inspection is the preferred solution for the following types of parts:

1. Parts with strict hole position relationships

Taking the robot joint shell as an example, there are multiple bearing holes and mounting holes distributed on it, and the coaxiality and perpendicularity between them are extremely strict - once they exceed the tolerance, there will be abnormal noise, jamming, and even affect the motion accuracy of the entire robotic arm after assembly. The same goes for the reducer housing. If the flange surface and hole system are not aligned, the transmission accuracy will be directly compromised.

Traditional measuring tools have no way to start with these spatial positional relationships. They must rely on a coordinate measuring machine to establish a spatial coordinate system, collect data point by point, and compare it with theoretical models in order to provide accurate deviation values.

2. Complex geometric features brought by multi axis machining

Robot structural components produced by five axis machining often have complex features such as inclined holes, free-form surfaces, and multi-directional mounting surfaces - for example, the torso skeleton and thigh/calf structural components of humanoid robots may have more than ten different angle holes and surfaces on a single part.

Traditional measuring tools can only measure dimensions in orthogonal directions, and are completely powerless against angular deviations of inclined holes and contour deviations of curved surfaces. CMM can establish a spatial coordinate system to uniformly evaluate all features.

3. Accuracy verification of thin-walled or easily deformable parts

There are many aluminum alloy thin-walled shells and frame structural components in robot parts, which have weak rigidity and are prone to deformation due to excessive clamping force or high cutting temperature during processing. Sometimes when the fixture is loosened and the measurement is qualified, it exceeds the tolerance again after reinstalling the fixture - this kind of elastic deformation is difficult to capture with traditional measuring tools.

Three coordinate measurement can track key dimensions throughout the entire process: once after rough machining, once after precision machining, and once again after releasing the clamping, to determine whether the deformation is within a controllable range.

The situation where three coordinates are not required

Simple gaskets, brackets, shells, etc. with a tolerance of 0.05mm or more can be inspected using calipers, height gauges, and stop and go gauges.

4、 Suggestions for selecting precision machining plants

Whether you are looking for a long-term cooperation with a precision parts CNC machining supplier or taking on a small batch order temporarily, as long as you clarify the following three issues in terms of testing capabilities, you can quickly screen out most unreliable manufacturers:

What three coordinate detection equipment do you have? Can you provide a testing report?

A reliable supplier will directly report the equipment brand and model, and be able to provide the first piece full inspection report and batch sampling records. Some small workshops only vaguely say 'we have testing', but when asked about the equipment used, the testing process followed, and whether the report can be traced, they hesitate.

How do you control the key dimensions of complex parts?

This question directly reflects the manufacturer's quality control experience. A professional manufacturer specializing in precision machining will have a mature inspection process - key dimensions are inspected piece by piece, form and position tolerances are measured using CMM, and sampling statistics are performed during mass production. And inexperienced manufacturers may not be able to come up with a complete testing plan.

How to ensure batch consistency and delivery time when delivering in bulk?

Many customers only focus on the processing quality of individual parts, neglecting the ability to control mass production. Batch orders must confirm the manufacturer's equipment quantity and scheduling mechanism in advance - sufficient equipment redundancy is necessary to ensure scheduling flexibility and delivery stability. If the manufacturer has too few equipment, once the schedule is tight, it can only be postponed.

We summarize with a table:

Taking Huiwen Zhizao as an example, the company is equipped with Zeiss three coordinate measuring machines in the field of precision parts CNC machining. The first piece of all high-precision parts must undergo three coordinate full-size inspection, and key dimensions are sampled during mass production. A complete quality inspection report is attached with the goods.

Huiwen Zhizao has a 20000 square meter factory equipped with 370+processing equipment, including multiple five axis machining centers, which can meet the full stage needs of parts such as humanoid robots, mechanical dogs, flexible robotic arms, bionic robots, medical robots, etc. from single piece sampling to batch delivery.

As a service provider that has long been deeply involved in the hardware field of robot bodies, Huiwen Zhizao provides customers with a full process service covering design, manufacturing, and assembly. In terms of humanoid robots, the innovation adopts a combination process of "new materials+new molds+precision machining" to help robots achieve rapid mass production and landing.

At present, the company has provided robot parts processing services to many technology innovation enterprises and research institutions such as Huawei, Xinsong, Xiaomi Ecological Chain Enterprises, Beijing Institute of Technology, and Chinese Academy of Sciences, and the accuracy and stability have been unanimously recognized by customers.

If you have CNC machining needs for precision parts, please feel free to provide drawing consultation.