Mk2 board lathe threading cycle problem

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Thread: Mk2 board lathe threading cycle problem

  1. #1
    Member topgraver's Avatar
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    Question Mk2 board lathe threading cycle problem

    I encountered a problem while using the G76 Threading Cycle. My test gcode is as follows:
    G0 Z0.0 X 0.0
    G76 P1.5 Z-10 I-0.5 J0.1 K0.3
    M30
    When I ran the program, the software interface did show both X and Z axis movement. But on the actual machine, the Z axis is not moving.
    I can confirm the Z axis is not moving only during the G76 cycle. I can jog and input Z axis movement code into MDI and the Z axis move just as fine.
    I also tried the G33, the Z axis also moved as intended.
    Could anyone help me with this issue? Thanks in advance.

    Regards,
    Pengjin

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  2. #2
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    Default Re: Mk2 board lathe threading cycle problem

    Your G76 line expands to:

    G21 G90 G91.1 G94
    G00 X0.200000 Z0.000000 (back)
    G00 X-0.600000 Z0.000000 (in)
    M50P0
    G33 Z-10.000000 K1.500000 (over)
    G00 X0.200000 (out)
    M50P1
    G00 X0.100000 Z0.000000 (back)
    G00 X-0.700000 Z0.000000 (in)
    M50P0
    G33 Z-10.000000 K1.500000 (over)
    G00 X0.100000 (out)
    M50P1
    G00 X0.000000 Z0.000000 (back)
    G00 X-0.800000 Z0.000000 (in)
    M50P0
    G33 Z-10.000000 K1.500000 (over)
    G00 X0.000000 (out)
    M50P1
    G00 X0.000000 Y0.000000 (EndPos)



  3. #3
    Member topgraver's Avatar
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    Default Re: Mk2 board lathe threading cycle problem

    I found the problem, it seems the wiring only works for common cathode. If it is wired as common anode, the axis will sometimes glitch. Not sure if it is a bug of the old board, found on two of my Mk2 board with TB6600 motor driver.



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    Default Re: Mk2 board lathe threading cycle problem

    You probably forget to invert axis output. When wiring is changed so is polarity. And most drivers don't like this.



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Mk2 board lathe threading cycle problem

Mk2 board lathe threading cycle problem