Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Surf6to8 on June 14, 2012, 01:35:32 PM

Title: Losing position PLEASE HELP!!!!!
Post by: Surf6to8 on June 14, 2012, 01:35:32 PM

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!!!

Title: Re: Losing position PLEASE HELP!!!!!
Post by: Glenn on June 14, 2012, 02:56:33 PM

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

Title: Re: Losing position PLEASE HELP!!!!!
Post by: Surf6to8 on June 14, 2012, 03:19:39 PM

It loses position at any speed 200ipm and 20ipm

Title: Re: Losing position PLEASE HELP!!!!!
Post by: Surf6to8 on June 14, 2012, 03:36:30 PM

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??

Title: Re: Losing position PLEASE HELP!!!!!
Post by: Surf6to8 on June 14, 2012, 03:53:35 PM

amazingly off

 off position .125" every 5 minutes

doesn't miss

every time

Title: Re: Losing position PLEASE HELP!!!!!
Post by: Hood on June 15, 2012, 02:05:56 PM

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

Title: Re: Losing position PLEASE HELP!!!!!
Post by: RICH on June 15, 2012, 06:21:34 PM

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

Title: Re: Losing position PLEASE HELP!!!!!
Post by: RICH on June 15, 2012, 06:41:02 PM

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

Title: Fixed
Post by: Surf6to8 on June 18, 2012, 05:51:03 PM

Fixed the problem

Thanks everyone

Title: Re: Losing position PLEASE HELP!!!!!
Post by: Glenn on June 19, 2012, 10:35:18 AM

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