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Home Forum Configuring LinuxCNC StepConf Wizard Backlash??

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TOPIC: Backlash??

Backlash?? 05 Jun 2012 08:50 #20663

  • conicio
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After updating from emc2 to linuxcnc I have an issue on my Z axis. It travels i.e. 10 mm in one direction and 7 in the other. I know this is due to a backlash inherent to the trapezoidal thread. Where can I find to fix a backlash problem that I've got with the z axis?
I'm getting stuck :blink: looking around int the stepconf wizard, the .ini and I can't find it.
Help please
Thanks
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Re:Backlash?? 05 Jun 2012 09:06 #20665

  • cncbasher
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add BACKLASH = x to the axis[2] section of the ini
x = amount of backlash required
Last Edit: 05 Jun 2012 09:06 by cncbasher.
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Re:Backlash?? 05 Jun 2012 09:14 #20666

  • BigJohnT
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There is a bit more to adding backlash compensation.

Please read the backlash section of the Integrators manual.

John
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Re:Backlash?? 05 Jun 2012 10:39 #20667

  • conicio
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Thanks I'll try it.
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Re:Backlash?? 06 Jun 2012 05:37 #20675

  • andypugh
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conicio wrote:
After updating from emc2 to linuxcnc I have an issue on my Z axis. It travels i.e. 10 mm in one direction and 7 in the other. I know this is due to a backlash inherent to the trapezoidal thread.

3mm backlash seems very unlikely. Do you actually have 3mm of thread pitch? I would imagine that 3mm of wear in the nut would convert it onto a tube...

Normally the weight of the knee or head takes up the Z backlash anyway.
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