Zero-Position Offset Cannot Be Restored
Posted: Wed Nov 11, 2026
Hello everyone, I’ve run into an issue following some disassembly and reassembly. The shaft of the manual pulse generator (MPG) encoder (https://www.oyostepper.com/category-228 ... rator.html) is secured to the handwheel shaft using a set screw. After taking it apart for maintenance and putting it back together, I discovered that the zero position has shifted by about two pulses; no matter how I adjust the set screw, I cannot return it to the original position.
Upon removing the encoder, I noticed a shallow indentation on the shaft surface caused by the set screw. The screw now consistently slips into this depression, but the position of the indentation no longer aligns with the original assembly phase. The shaft has been damaged, and replacing it would be costly.
I’d like to ask for your advice: how should I address a zero-position offset caused by a set-screw indentation? Should I grind the indentation smooth, or should I switch to a clamping mechanism that doesn't rely on a set screw?
Thanks in advance for your help.
Upon removing the encoder, I noticed a shallow indentation on the shaft surface caused by the set screw. The screw now consistently slips into this depression, but the position of the indentation no longer aligns with the original assembly phase. The shaft has been damaged, and replacing it would be costly.
I’d like to ask for your advice: how should I address a zero-position offset caused by a set-screw indentation? Should I grind the indentation smooth, or should I switch to a clamping mechanism that doesn't rely on a set screw?
Thanks in advance for your help.