In article ,
"Dennis" wrote:

I've got a problem I cant seem to sort on my little DIY CNC router, my limit
switches don't work!


1) I've installed limit / end of travel switches on the x,y & z axes.
2) The switches are wired in series and wired to input 10 and enabled.
3) The switches are all normally closed, the input goes hi when switches
operate.
4) In diagnostics I can operate any of the switches manually & the program
senses it ok.

But.... when I jog any axis or run some code to move an axis, operating any
of the switches does nothing. I expected the motors to be disabled when I
operated a switch.

I've tried inverting the active level of the switches (ie hi/low active) and
have tried changing just about every other setting.

I've watched a couple of the mach3 videos (which have taught me a lot) but
cannot find out what the problem is.

Any clues guys?

Yeah. Limit switches should cut the electrical power to the motors by
means of relays, not computers, precisely so confused CNC cannot break
the machine.

Joe Gwinn