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MagIO2 wrote: Is the housing of the switch broken? Was it broken before? What kind of material do you mill? Do you use a vacuum cleaner for immediate sawdust removal?
In the german part of the forum we discussed about statical charges and putting earth connections to all parts of the machine to avoid this. Enough charge can produce little sparks. These are under suspect to destroy the alloy running surface and leading to errors in USB communication so far.
I could also imagine that the discharge can also destroy the input of any electronic circuit connected.
Do you use WinPC? USB board?
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Rory wrote: Not quite that simple as the circuit is also in series with the X axis switch - so the circuit could already be broken here.
you need to test for continuity change.
multimeter across the XZ lmit pins - press switch - should go from "yes continuity" to ... "no continuity". Switching the switch breaks the signal.
it could be that when you disconnect the wire - the other switch is also breaking the circuit so your breaking an already broken circuit?
however with UCCNC if the switch circuit is broken the machine will not reset - no sure about winPC?
The only sure way to know if its the board - is to see the beep from the multimeter as you press the switch at the terminals.
or get a piece of wire and short / open the switch circuit at the switch terminals.
process of elimination.
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