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How to implement servo in place of Z motor

caelfcaelf
in Motor Control
I'm working on a pen plotter that runs on repetier firmware. The idea is that gcode would be generated with inkscape. The plotter uses the standard x/y axis and a servo for the Z axis. The servo lifts the pen off the paper when moving to a new starting point. My question is, how do I implement this into the firmware?

Comments

  • RepetierRepetier
    Don't think of it as z. Think more like on/off.

    For on add
    M400 ; Wait moves to finish
    M340 .... ; servo position
    G4 P50 ; // wait for servo to position

    And for off
    M400 ; Wait moves to finish
    M340 .... ; servo position off
    G4 P50 ; // wait for servo to position

    So just add these extra commands in the inkskape output at start/end of a stroke. Since moves are buffered it is important to sync moves with M400 and M340 needs a wait to give servo enough time to position pen.
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