- Joined
- Aug 15, 2013
- Messages
- 2,116
Nyala,
You may be having the same problem that I ran into with my mill before I added a quill stop. Mine isn’t a PM, but I think the same principle may apply. There is backlash in the rack and pinion that drives the quill up and down when you use the handwheel or the fine adjust knob. When I plunge milled with the fine adjust engaged and without a quill stop, I would run the the end mill down to my target depth and stop. The end mill would continue going deeper for a few thousandths until it took up the backlash. It drove me crazy until I noticed the Z-axis DRO changing after I stopped plunging. Before I installed a quill stop, I learned to sneak up on my target depth once I got close. Try plunging to a target depth with your fine adjust and then stop and watch the DRO to see if yours does the same as mine.
Tom
You may be having the same problem that I ran into with my mill before I added a quill stop. Mine isn’t a PM, but I think the same principle may apply. There is backlash in the rack and pinion that drives the quill up and down when you use the handwheel or the fine adjust knob. When I plunge milled with the fine adjust engaged and without a quill stop, I would run the the end mill down to my target depth and stop. The end mill would continue going deeper for a few thousandths until it took up the backlash. It drove me crazy until I noticed the Z-axis DRO changing after I stopped plunging. Before I installed a quill stop, I learned to sneak up on my target depth once I got close. Try plunging to a target depth with your fine adjust and then stop and watch the DRO to see if yours does the same as mine.
Tom