u/WoodTechEngineer

I’m running a 4th-axis setup on my CNC router for cylindrical wood parts. The toolpath itself looks correct in CAM, but when the rotary axis completes a full rotation, the pattern doesn’t line up perfectly, there’s a slight mismatch at the seam.

I’ve already checked zero setup and post processor settings, and everything seems fine there.

Could this be a mechanical backlash issue on the rotary axis, or is there something else I should look into (like fixture rigidity or steps per rotation calibration)?

Any advice from people who’ve solved similar issues would be really helpful.