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Confused about Hard limit and pull-off

Discussion in 'CNC Mills/Routers' started by DaveStewart, Aug 26, 2017.

  1. DaveStewart

    DaveStewart Well-Known
    Builder

    Joined:
    Jul 20, 2017
    Messages:
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    Hey folks.
    First off, sorry for posting this in the wrong area, should have been in Electronics, but I can't change this.

    I have Homing and limit switches installed and Home sequence works, including 5mm pull-off.
    Now, when I test the Limits (jog until I hit one), it does as expected:
    ALARM:1 (Hard limit)
    [MSG:Reset to continue]

    The issue I have is no pull-off happening on Limit and thus cannot reset because switch is still tripped.
    Even when I back off manually to reset switch, I cannot unlock.
    Is this normal, why does pull-off not initiate for Limit?

    Thanks in advance.
    grbl-Mega 1.1 running on Arduino Mega and cnc.js running on raspberry pi.

    Here are my relevant grbl settings:
    $20=0 (Soft limits enable, boolean)
    $21=1 (Hard limits enable, boolean)
    $22=1 (Homing cycle enable, boolean)
    $26=250 (Homing switch debounce delay, milliseconds)
    $27=5.000 (Homing switch pull-off distance, millimeters)
     

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