1. #1

    I wonder if anyone can help with a z probe issue I have.

    I have a Chinese CNC3040 cnc machine, with a arduino to db25 adapter - basically converting grbl to mach3.

    I have the A5 and GND pins wired for a z probe in GRBL.

    I am using BCNC software and when i short the 2 z probe wires - I get confirmation that the zero point has been reached.

    When I carry out a z probe routine on the actual cnc (gnd to chassis and z probe to milling bit) - the probe stops short of the zero point and I have to run the routine 2 or 3 times before it actually get to the correct zero point.

    I have checked all the wiring on my 3040 - as they are known for bad GND`s. I have also checked the continuity from the chassis to the milling bit to make sure its open circuit.

    Does anyone have any ideas how to solve this problem?

    Do I need a resistor or capacitor to smooth the z probe line?

    Many thanks in advance.


  2. #2
    Hi Iain have a look at my blog. Copy and paste the code and forget to put the height of your code in. All is explained in the text

  3. #3

  4. #4
    Hi Kev,

    Many thanks for the info. I literally just found the solution to my problem :)

    I put a 100nf cap between the probe pin and ground and now it all works great :)

    Itching to do some milling, but got work at 6am :(



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