So I was minding my business and all of the sudden the Z decides to go nuts and overshoot it’s target.
Well as a reader you probably go yea, I would proceed to change my shorts , after cursing at the sky for 5 minutes and to be honest you wouldn’t be wrong .
My reaction however was different, I was quite staring at my part wondering what in the world I just witnessed. Needless to say it was on the chamfer tool operation where I first witnessed this and my chamfer tool turned into a drill bit…yea go ahead and laugh thinking back at the stunned look on my face I’m sure I looked pretty funny.
I will spare you all the non-issues and jump right to it the Servo drives are so AWESOME that the older design of coupling couldn’t handle the torque of the new drive. In my experiments I found that the Z only had an issue when traveling in the negative Z not when returning to a G30 and only when going full rapid. My hypothesis which was later confirmed by the support guru’s at Tormach HQ is that the coupling would slip just a little and the motor would try to catch up before finally erroring out. If the velocity was at 50% the issue would go away so basically if the machine was running at stepper speeds no issue.
So after trying to tighten the screws on the coupling and then a second time with LocTite I found that the issue came down to a worn coupling. I proceeded to replace the coupling and while I was at it coated the inside of the mating surfaces with a light coat of BLUE Loctite which is considered removable and should you need to replace the coupling in the future you will thank me.
To document it I decided to record all the experience via video and upload to Rumble.
Please note the purpose of the video wasn’t to make a massive presentation but rather simply to document the process so it is a little crude but shows all the steps taken to troubleshoot and resolve the issue.
#Mill #770M #770MX