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Z limit switch on a 2.5D machine

Discussion in 'General Talk' started by Willis, Mar 28, 2019.

  1. Willis

    Willis New
    Builder

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    I am making my first foray into CNC machining with an old Amdek plotter and running GRBL on an Arduino Uno. So far everything works great and I can plot perfectly! The last bug is getting the plotter to go through the homing cycle. If I click the "Home Machine" on the Universal GCode sender, the plotter barely blips and just sits there. I suspect it is looking for the Z limit switch which I don't have and don't need. (I do a raise and lower pen with a solenoid). I have run the setup wizard and it does recognize the +/- X and +/- Y switches.

    Should I just put a jumper across the +/-Z pins on the control board (protoneer CNC shield) to fool GRBL? My switches are wired Normally Open.
     
  2. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    What you need to do is read the GRBL wiki which tells you how to do this.
    You have to recompile GRBL to tell it to ignore Z homing, jumpering will just cause trouble and will not work.

    gnea/grbl

    So you need to read the config.h file carefully and make changes to ignore Z homing.
    instructions for 2 axis homing are in this page gnea/grbl
     
  3. Willis

    Willis New
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    Hi David,

    That did the trick! Thank you.
     
    David the swarfer likes this.

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