Hi all! I have a problem with a CNC I've recently built. I use UCCNC software, the drivers are CW5045, and some breakout board from cnc4you (5-axis). The motors are Nema23 4Nm, the system frame is about 2m by 1.2m. There is a problem with proper calibration of the CNC. Sometimes the system does not return to the starting position along the axes (even in calibration mode). From what I understand it is related to motors missing steps (for reasong unknown to me). Also, when cutting in the wood the dimensions are always smaller than what they should be. I have already tried different speeds (I have slowed down the linear speed to 2m/min. it barely helped). The most annoying thing is that sometimes the CNC works fine, making few perfect moves and then it loses 1mm along 5cm line. I would greately appreciate any help.
seems to me you are having electrical interference rather than physical issues (but do check for rough spots in the motion!). so, read these things http://openbuilds.com/threads/electronics-101.693/ http://openbuilds.com/threads/wiring-loom-question-on-how-to-avoid-interference.1084/ http://openbuilds.com/threads/i-cannot-get-my-axis-move-right-in-mach3.833/ slowing down top speed is one thing, but you also need to try slowing down the acceleration rates.
