Forum

Full Version: DRO runs away when I turn on motor
You're currently viewing a stripped down version of our content. View the full version with proper formatting.
So, I'm not sure where to start troubleshooting this, aside from swapping out the DRO entirely.

This is on my lathe. Whenever I turn the motor on, the Z axis DRO readout starts rapidly increasing. I'm using the original iGaging linear scales, with shorter and shielded cables. The lathe uses a KB Electronics PWM. 

Here's a video of it in action:
https://youtu.be/Oc5jP8JfYJQ

Any ideas what's going on and what to look at first?
A couple of things to try:
1. Power the scale interface from a different plug, e.g. across the room.
2. Make sure there is no oil etc. on the Z scale.
3. Electrically isolate the Z scale from the frame of the lathe

I have a KC1022 with KBCC-125R. The only problem so far was cutting oil on the Z axis scale giving problems. I sealed the cover better to avoid that in future.
(02-14-2019, 11:30 AM)Zoltan Wrote: [ -> ]So, I'm not sure where to start troubleshooting this, aside from swapping out the DRO entirely.

This is on my lathe. Whenever I turn the motor on, the Z axis DRO readout starts rapidly increasing. I'm using the original iGaging linear scales, with shorter and shielded cables. The lathe uses a KB Electronics PWM. 

Here's a video of it in action:
https://youtu.be/Oc5jP8JfYJQ

Any ideas what's going on and what to look at first?

For me, the best solution to noisy/drifting scales was adding power supply decoupling capacitors in the scale read heads.  Transformer-type wall warts can help some, but the decoupling is really the solution.