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I have a Chinese 6040 with Mach 3 to control it. generally, I have had little trouble with it, but lately, it has been giving me trouble by not starting the spindle. last time it broke a bit when I was not watching as I started the cut. I fiddled with it and got the spindle running (I actually have no idea what fixed the problem) but the next time I started the computer the spindle would not spin up even when pushing the spindle switch on the Mach 3 screen. I have changed nothing in the Mach 3 setup and have no idea why it is misbehaving. I checked the wiring and the electrical output from the controller and there is no problem with electrical connections. No electricity is present at the controller when a manually start the spindle in Mach 3. so I believe that Mach 3 is where the problem is. This is a USB connection from the computer to the controller.

I am baffled and having trouble understanding what should be a simple problem. What is necessary to ensure that the spindle turns on when you click the switch in Mach 3?
 

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Ross
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Welcome to the forum.
 

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G'day Lev, welcome to the forum..
 

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Mike
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Sounds like you have a loose wire, bad connection, or a dirty/sticking/bad switch. Could also be in the control board but I'd look for loose wires and bad connections first.
 

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I had a CNC 6040 with power supply problem to the spindle. I stripped back the wire insulation and found a broken wire.

 
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