As I'm running i loose position. Running simple toolpath +60" back to 0 on my Y axis, it's only loosing position going back to 0. About .125" every 2-5 minutes. What is going on?

Please someone help!!!

Hi surf,
  Check all mechanical linkages,loose wiring, then if you still have the same problem, it is probably that you have steppers tuned to fast.
 Retest by cutting air, and start 1/2 the speed that you are set at now, and gradually increase the max speed until
the motors miss a step, then back the max down 20% and you should be about where the motors can run safely without fear of missing any steps.
   Every one wants the fastest speed they can get from a stepper, but that speed isn't really the most reliable speed.
 I would like to hear how things turn out for you.
Glenn

It loses position at any speed 200ipm and 20ipm

more info

two things
1. 5v power supply to drive
I have the ground attached to the chassis and power to drive pul+ and dir+
If I disconnect the - from the 5v the stepper starts moving slow

2. Power ground to the chassis

Question, if the neg- on 5v the same as chassis ground??

amazingly off

 off position .125" every 5 minutes

doesn't miss

every time

Every 5 mins regardless of distance moved or speed moved in that 5 min period?
Hood

No need to to post the same problem twice.  The info below is from your other post which will be deleted.

I'm trying to cut a part and my Y axis is constantly losing position. This is driving me nuts!!

What is causing this???

under the hood:

Keling Nema 34 1200oz, Drive KL-9082, Apollo I Breakout Board V1.0 (MachMotion)

Am I missing some setting?

RICH

Sorry, I don't understand what your saying.
Are you saying that you have the machine axis  constantly moving back and forth 60" and after 2-5 minutes the axis on returning to zero
is off?

RICH

Fixed the problem

Thanks everyone

Hi Surf,
  Glad you fixed the problem- I'm curious as to what you found?
Thanks,
Glenn