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21439Re: [turbocnc] coordinates drift !

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  • Art Eckstein
    Nov 25, 2013
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      Try turning off backlash compensation. I found this to be a problem
      using home switches before I had zero backlash nuts on the axis.

      Art
      Country Bubba


      At 08:49 PM 11/25/2013, you wrote:
      >Thank you all for the very good suggestions.
      >
      >---
      >
      >Verified mechanical tightness of the step-motor shafts and it is ok
      >btw, the table moves quite light so the step motors make very little
      >effort...
      >even so it is solid tight.
      >
      >long cycle of G1's make no errors
      >same part but using large doses of G2 G3 to round corners is a disaster !
      >
      >To be done:
      > - testing another PC. (I see what you mean... I may have
      > noises on this
      >PC LPT )
      > - testing CNCpro
      > - testing Mach3 ?! (but I rather prefer to stay without mouse etc...)
      >
      >---
      >
      >I see the movements of the G2 and G3 quite odd !!!
      >It slows down immensely despite having the same feedrate as a G1 move.
      >I would say an arc at F200 goes at 1/10 of the speed of a linear move
      >even if the arc is shallow like a straight line.
      >
      >Is this normal ??? Or am I having an issue here ?
      >
      >Also apparently if the arc makes one axis move positive and then negative
      >I don't see it applying the backlash compensation when it inverts motion
      >inside the arc... but this could be my eyes ;-)
      >
      >Luis Cupido
      >ct1dmk.
      >
      >btw, machine is a 486DX2 66MHz... maybe it is a too slow PC !!!
      >but it has been excellent so far ! :-(
      >
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