Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: multiplex on May 20, 2009, 08:08:00 AM
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hello everyone,
i've started to map my screws, taking data every 2 inches.
i would move to my target, input the actual position and add the point.
When i turn on screw correction, it actually doubled the error at each point.. for example.
i move to 12" on x. True position is 12.008. With screw mapping turned on, i get 12.016 as position when i remap the screw.
anything i did wrong?
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FYI - It is my understanding that screw mapping works only when running G-code, not when jogging. Basically, it's not particulalrly useful in its current state....
Per Art:
"Screw mapping only works in Gcode. Since Mach3 is a pulse buffering program, its not possible to map for Jog modes and such, so the mapping was written only for program runs in the interpolator. Its rarley used, and I havent looked at the code for a couple years on it. So much work has been done on the interpreter over the past year or so I cant guarentee that its still functional, but you can only expect a result in Gocde run's. Last I looked it was still working fine."
Regards,
Ray L.
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Thanks for your reply - that is interesting info
I would assume that since I was executing my movements in MDI that the mapping was taking effect
as soon as I turned mapping off the error went back to my previous numbers
I'll have to play around some more