How to balance lightweight design with high durability? This was the challenge when a robotics startup approached us to manufacture a custom robot joint housing. The part required Aluminum 7075 for strength but featured complex thin walls that demanded expert CNC machining strategies. In this project, our solution for custom CNC machining robot joint housing focused on controlling internal stress and ensuring concentricity, proving that we can deliver reliable parts even for the most complex humanoid robots.

Part type: Robot Joint Housing/Casing/Shell 

Material: Aluminum 7075

Key Tolerance: 0 / +0.02 mm

Concentricity: ≤ 0.015 mm

Quantity: 20 pcs

Quality Control: CMM Inspection, 100% Full Dimension Check

Lead Time: 15 day

To ensure the highest precision for this thin-walled part, we implemented a strict multi-stage process. We began with rough machining, leaving a 0.5mm allowance, and allowed the parts to settle for 24 hours to fully release the internal stress of the material.

To prevent deformation during finishing, we designed a custom internal expansion fixture (ID Clamp) to hold the part from the inside, distributing the clamping force evenly. Finally, utilizing our 5-axis CNC machining center, we completed the complex curved surfaces and side mounting holes in a single setup without re-fixturing, which significantly improved the positional accuracy relative to the center axis.

 Whether you need a single prototype or low-volume production of complex aluminum parts, we have the expertise to deliver. Click Here to Upload Your CAD Files