I have been using my K8200 for some time and it has been printing ok.
(I’d like to get it printing better)
I have done various upgrades (improved Z-Axis, end stop screw etc)
I have been working on implementing the z-probe for auto-bed levelling using the capacitance sensor.
thingiverse.com/thing:447719
I have built the circuit off line and the sensor does in fact trigger by pretty much any surface at pretty much 1mm
However when looking at how my CURRENT z-end stop switch works I was surprised by its behaviour
When I move the Z-axis using host software it moves up and down fine
However when the Z-axis is moving down (under motor control) if I manually trigger the z-end stop switch shouldn’t the z-axis stop immediately
That is how the x and Y axis work.
When the z-axis moves down to the zend stop switch it triggers fine and I have no issue printing (is manually triggering that does not work).
In order to debug I have disconnected the z-end stop switch from the controller board and checked the switch operation with a continuity tester and it works fine (normally on and goes open when triggered)
I have checked the board as well and it has 0 and 5v on the relevant pins where the z-end stop switch is connected
I can’t understand why I am seeing the behaviour I am but still being able to print with out an issue as the switch definitely appears to be triggering the z-axis to stop when it gets to the heated bed - if it wasn’t working I would see the nozzle head crash into the bed.
Obviously I am missing something (probably very simple !!!)
Anybody able to throw light on this
tks
Noel