Does the thin-walled part of the motor housing deform when clamped? Shenzhen Huiwen Intelligent Manufacturing Disassembles 2026 Motor Parts Processing Technology

Shenzhen Huiwen Zhizao has been deeply engaged in precision machining of robot components for many years, has received more more motor drawings in recent years. We have been working in the CNC machining of motor parts for many years, the most common questions customers are "can it be machined", but these three sentences: "What should we do if the motor casing is so thin deforms with just one clamping?" "How can we ensure the coaxiality of the motor shaft?" "How can the heat dissipation ribs always vibrate the knife break

The answer is actually complicated: motor components are different ordinary structural components. They do eat length, width, height, but shape position tolerances - coaxiality, roundness, end face runout. The air gap between the stator rotor is uniform uneven, which directly determines whether the motor shakes, produces loud noise, has a long lifespan. In 2026, the use of robot servo motors frameless torque motors will increase, the precision requirements for core components such as motor housings, motor end caps, motor shafts will also rise. There are many factories in Shenzhen that process robot motor parts, but what can balance accuracy delivery time is just slogans, but the entire chain of materials, equipment, processes, testing. This article will explain the process of CNC machining of motor parts provide you with a practical list of pitfalls to avoid.

1、 What are the difficulties of motor components: three repeatedly asked precision pain points

Motor parts are divided several categories: shell (including heat dissipation ribs), end cover/flange, motor shaft (rotor shaft), bearing seat, stator support. They have different levels of difficulty:

The conventional standards for machining motor parts in the industry are roughly as follows: bearing position tolerance ± 0.005-0.01mm, coaxiality around 0.01mm, surface roughness Ra0.2-0.8 μ m (depending on the location), minimum wall thickness of thin-walled parts of about 1mm. Once the size exceeds the tolerance the coaxiality runs out, the vibration, noise, abnormal noise of the motor will appear together after assembly, the overall failure rate of the machine will increase - this is the machining of motor parts really takes effort.

2、 Choosing the right materials first: how to choose the four mainstream materials

The selection of motor component materials directly determines the process route cost. This step was wrong, the rest will be in vain:

3、 Equipment clamping: why "one-time clamping" is the lifeline of motor parts

Half of the precision of motor components lies in the equipment, the other half lies in the clamping. In 2026, for motor parts processing, Shenzhen's five axis linkage processing is basically standard - sloping surfaces, heat dissipation ribs, porous systems on the shell. The five axes can be clamped in one go to avoid the accumulation of coaxiality positional errors caused by secondary clamping. The slender motor shaft requires more attention, the combination of turning milling equipment with the center frame for segmented processing reduces cutting bending.

One clamping is only about saving processes, but also about ensuring accuracy: the shell stopper, bearing chamber, end face runout should ideally come out in the same clamping process, with a unified reference tolerance to avoid conflicts. That's also why many motor component drawings look simple but have long lead times - factories with unreasonable processes rely solely on multiple clamping hard fitting, resulting in unstable accuracy. CNC machining plants like Shenzhen Huiwen Zhizao, which specialize in robot components, do exactly this.

4、 Tools cutting parameters: How to break thin-walled, deep cavity, heat dissipation ribs

·Thin walled shell: Aluminum alloy shell with a wall thickness of around 1mm, most afraid of cutting deformation. The countermeasures include rough fine machining, reducing cutting depth, high-speed small chip cutting with PCD diamond coated knives to reduce cutting force; If necessary, use fixtures to support prevent vibration.

·Cooling ribs: High narrow ribs that vibrate when cutting. The countermeasure is to control the cutting width, prioritize sequential milling, avoid excessive tool overhang, separate cutting between ribs for processing.

·Deep cavity components: elongated tool holder, prone to interference. The countermeasure is to simulate the tool path using CAD/CAM, predict interference, if necessary, change the angle head segment clear the angle.

·Stainless steel/titanium alloy motor shaft: generates high heat sticks to the blade. The countermeasure is TiAlN coated cutting tools+sufficient cooling+reasonable cutting depth to stabilize surface quality avoid burning sticking of the tool.

5、 The final say to check: how to match CMM, roundness meter dynamic balance

It is enough to simply measure the size of motor components, but also to measure their shape position:

·CMM three coordinates: full inspection of key dimensions, positional accuracy, coaxiality.

·Roundness meter: specialized for checking roundness cylindricity, it is used for motor shafts bearing chambers.

·Dynamic balancing machine: Parts such as motor shafts shafts that have excessive unbalance shake at high speeds must undergo dynamic balancing verification.

·Roughness meter: bearing position, optical axis section, mating surface, Ra value directly determines assembly sealing.

Quality control should be integrated throughout the entire process: prior inspection of incoming materials (aluminum alloy impurities, non matching grades should be returned directly), SOP traceability should be retained in the process, a combination of full inspection of key components routine sampling of finished products. The yield rate is stable, it's about the last one, it's about every previous one.

6、 Sample production to mass production: how to coordinate small batch fast iteration

Many robot motors are still in the prototype iteration stage, with drawings being revised every three days. This type of order may be accepted by major manufacturers may have a long lead time. The vertical route for small batch CNC machining in Shenzhen is more suitable for: accepting single piece sampling, fast sample production, responsive to changes in drawings, processes, tolerances, DFM front-end - when the drawings are sent over, engineers first conduct a manufacturability review, whether the thin-walled can be guaranteed, whether the deep cavity should be disassembled, whether the tolerance is reasonable. They explain clearly before quoting, saving back forth.

5 confirmation items before sending pictures

1. Does it include a motor shaft/slender component? What is the length to diameter ratio, does it require milling center frame support.

2. Minimum wall thickness: Is there any thin-walled component with a thickness of ≤ 1mm, should anti deformation technology be applied.

3. Material grade: Aluminum alloy, stainless steel, titanium alloy, electrical pure iron, with significant differences in material, process, quotation.

4. Tolerance requirements: The key tolerances for bearing position, coaxiality, positional accuracy determine the testing method cost.

5. Surface treatment: Should anodizing, coating, polishing be applied, are there any size changes required after treatment.

About Shenzhen Huiwen Intelligent Manufacturing Technology Co., Ltd

Shenzhen Huiwen Intelligent Manufacturing Technology Co., Ltd. is rooted in Shenzhen specializes in precision machining of robots. With years of experience in precision machining of robot components, we are a hardware processing service provider dedicated to CNC machining. Our business is to assist robot manufacturers integrators in the manufacturing of precision components. Capable of Shenzhen five axis linkage machining, covering commonly used materials for robot motor housings, end caps, motor shafts, joint structural components such as aluminum alloy, stainless steel, titanium alloy, engineering plastics. Prior to DFM process evaluation, 2D drawings 3D models are sent over, engineers conduct manufacturability reviews before providing itemized quotations. Support for single piece sampling small batch sampling of motor parts, adapting to robot prototype trial production early mass production stages.

3 common misconceptions

·Misconception 1: Thinking that motor parts only need to have accurate dimensions. In fact, the geometric tolerances such as coaxiality, roundness, end face runout are the key to success. Even if the dimensions are accurate, if the coaxiality is compromised, the motor will shake like a shaking machine.

·Misconception 2: Thin walled parts can be easily clamped processed. When the clamping force is high, the workpiece directly deforms. After loosening the clamp, it rebounds is measured to be out of tolerance. The work is in vain.

·Misconception 3: The shorter the delivery time, the better. The motor parts have multiple processes (processing+stress relief+testing+possible dynamic balancing), compression to the limit often sacrifices accuracy, resulting in a decrease in sample qualification rate.

Frequently Asked Questions Q&A

Q1: Can the motor housing be machined with a thin wall of 1mm?

Can. The key lies in the process: rough fine machining, controlling cutting force, adding support pads if necessary, cooperating with PCD cutting tools. It is recommended to conduct a DFM evaluation before processing to confirm the minimum wall thickness anti deformation plan.

Q2: The coaxiality requirement for the motor shaft is 0.01mm. Can it be achieved?

Okay. Use a one-time clamping/milling combination to ensure uniform reference, coordinate with CMM roundness tester for full inspection. The premise is that the drawing tolerances are given reasonably, do stack overly strict tolerances in unnecessary places, as it will only increase costs.

Q3: What should I do if stainless steel motor parts are prone to sticking to the knife during processing?

Use TiAlN coated cutting tools+sufficient cooling+reasonable cutting depth to avoid tool burning. Stick the knife to scratch the surface, if it's severe, it can be a waste part. The process cutting tools must be properly matched.

Q4: Can I take a single sample?

Take it. Support single piece sampling, in conjunction with DFM front-end, evaluate the process first before quoting, keep up with the prototype iteration stage for drawing changes.

Q5: How to quote, is the price transparent?

Evaluate according to the drawings, list the sub items of materials, processing, surface treatment, provide a quotation for each sub item after DFM review, without making a vague quotation based on a fixed price.

Summary

The difficulty of machining robot motor parts lies in "whether they can be machined", but in "whether they can be machined stably with high precision" - material selection, one-time clamping, tool process matching, accurate detection. When these four things are linked together, the shell does deform, the shaft does shake, the delivery time is delayed. If you are worried about the processing of motor housing, motor shaft, motor end cover, want to know the quotation for motor housing processing do DFM process evaluation for motor parts, please feel free to provide drawing consultation. We can provide 2D drawings, 3D models, technical requirements to obtain DFM process evaluation itemized quotations.