@Ryan, I have limit switches for the Z Axis, but not for X or Y. In my previous build I had a lot of trouble with the limit switches and “mechanical” failures, it was one of the reasons I moved to sensor-less homing.
I did spend some time adjusting the bump sensitivity, and homing speed, and I have not noticed any issues with accuracy.
To be fair, I have only used my CNC to cutout individual wood shapes, where accuracy / repeatability is not required. Think 40 little Christmas tree ornaments…where they do not have to be perfectly the same.
Part of the reason for the spindle upgrade was to attempt more difficult projects where this might be a factor.
The vacuum mount definitely interferes with the endstop. I will see if I can rework the mid vacuum mount to possibly integrate the endstop, Using that extra hole to help support everything can’t hurt, and I think it would be better even for the sensorless homing to bump a more solid part rather than the flimsy vacuum clip.
I have the spindle mounting hardware installed now, and I hope to be able to spin up on the weekend. So far I am happy with the solution, but I may have to resort to leveraging the upper bearing bolts as studs to lock the top mount down.
