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Author Topic: New...And very odd issue  (Read 1926 times)

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New...And very odd issue
« on: May 02, 2012, 04:11:10 PM »
In 10+ years of working with Mach on numerous machines, I've never seen this one.  When you zero the X axis, then G0X50, it moves 50".  If you G0X0 it moves back 48.75".  The error accumulates consistently as the length of travel increases.  50" will always produce an error of 1.25".  96" of travel will always produce the same error of about 2".  The closer to zero the travel gets, the smaller the error.  We know it's not a mechanical issue and to make it even more perplexing, if we zero on the other end of the table and G0X-50 followed by G0X0, it returns properly to zero.

Has anyone heard of such a thing?  We're re-installing Mach3 since everything else has been checked OK.   It's almost as if Mach is using different steps per settings for X- vs X+ motion.  If it were something loose or random missed steps, I wouldn't expect a consistent error.

Thanks

Offline BR549

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Re: New...And very odd issue
« Reply #1 on: May 02, 2012, 04:24:51 PM »
I would reloading a KNOWN good XML file, NOT the mach3 backup. I have seen corrupted xml do some strange things.

(;-) TP
Re: New...And very odd issue
« Reply #2 on: May 02, 2012, 04:50:16 PM »
Tried that first thing.  It didn't help.

Offline Hal

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Re: New...And very odd issue
« Reply #3 on: May 03, 2012, 08:48:04 PM »
half the max speed and accel ans deccel. Refigure the steps per unit also. Maybe recal the x axis

Hal