Thread: CNC3040 Z Probe problem.
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22-03-2018 #1
Hi,
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.
Iain
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23-03-2018 #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
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23-03-2018 #3
Sorry here’s the link
http://the-cnc.blogspot.co.uk/p/z-probe-code.html?m=1
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23-03-2018 #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 :(
Cheers
Iain
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