Yesterday and twice today during the same 3D carve my x axis somehow started cutting too far to right like it lost position. I verified zero on each occasion and it was fine. I verified gcode simulation and it was fine. I checked belt and same tension as always and I checked drive pulley, it wasn’t obviously loose or at least I couldn’t tighten, every time I tried with a 1.5mm Allen wrench it didn’t fill like correct size. Tried 2mm and it was to big and 1mm and 1/16 were too small.
So not sure what is happening, each time it screw up was going from left to right.
Try marking the pulley and shaft and see if it’s shifting?
I would suggest also checking feeds and speeds — depending on the toolpaths it could result in the machine getting pulled in one direction — possible to try rotating the design 90 degrees?
Well that’s weird…theoretically, the endmill slipping in the collet may have caused a similar effect, but in this case it is very unlikely, and I would expect a “3D” profile at the bottom of that extra slot, not something perfectly flat like that. Did you have a chance to see how the bit was moving at the time this happened ? Is there anything suspicious on the left side of that cut ?
