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G-Code, CAD, and CAM discussions / Re: Z axis losing steps.
« on: January 07, 2017, 01:45:06 AM »
Hi,
This issue has been mentioned in other forums and posts by users who found it was one of the following
- loose spindle motor mounting
- loose grubscrews on a flexible coupling which is often found between the Z stepper motor shaft and the Z ballscrew, especially on Chinese CNC routers
- mismatch or looseness on the shank of the cutter in the collet. I found this with what proved to be a 6 mm shank in a 1/4" ER11 collet. Due to the cutting angles, the cutting forces can push or pull a given cutter in or out.
- collapsed thrust bearing on the spindle motor shaft (that would be rare)
Good luck
This issue has been mentioned in other forums and posts by users who found it was one of the following
- loose spindle motor mounting
- loose grubscrews on a flexible coupling which is often found between the Z stepper motor shaft and the Z ballscrew, especially on Chinese CNC routers
- mismatch or looseness on the shank of the cutter in the collet. I found this with what proved to be a 6 mm shank in a 1/4" ER11 collet. Due to the cutting angles, the cutting forces can push or pull a given cutter in or out.
- collapsed thrust bearing on the spindle motor shaft (that would be rare)
Good luck