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General Mach Discussion / "go to zero" doesn't go to zero and other issues.

« on: July 06, 2012, 07:30:25 PM »

Hello all,
   I'm using mach 3 version 3.043.022, and am getting some abnormal results.  I just ran a program, then hit the "go to zero" button, y and x went to zero, but z went from 0.125" to .0017".  This is what mach 3 displayed on it's DRO.  This is a constantly recuring problem on the machine, sometimes if the axis is within .015" of zero, it won't move at all when i hit the "go to zero" buttom.  This happens for all the axis on the machine.

Another issue i've noticed which may be related:
load & run "vice home",zero all axis, then .001 incremental jog 10 times(all axis do this):
    1) .0000
    2) .0000
    3) .0024
    4) .0024
    5) .0049
    6) .0049
    7) .0049
    .0073
    9) .0073
   10) .0097

load & run "cribbage board drill 1",zero z (all axis do this), then .001 incremental jog 10 times:
    1) .0010
    2) .0020
    3) .0030
    4) .0040
    5) .0049
    6) .0060
    7) .0070
    .0080
    9) .0090
   10) .0099
this is repeatable, i can load either program, run it, and then incremental jog with the same results
the numbers above are the numbers shown in mach.  Actual table movement is ~ the same as measured with a dial indicator.

The theoretical motor/table resolution is .0000492".

Any ideas on what might be the issue?

Any and all suggestions are much appreciated.

Brian