Leon82 wrote: There was talk of the axis coasting to a stop after the switch is toggled
That was me!!!
I found on my plasma table that on homing the axis coasted past the home switch and needed to remain triggered yet if it hit a limit switch, the machine stopped dead in its track!
So after some experimentation, Here is how I configured my home and limit switches on the travelling part of the axis.
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The left prox sensor is the limit, the middle (lower) prox sensor is the home switch and the sensor on the right is the limit switch for the other end of the axis.
So on homing the axis moves to the left until the home switch is triggered by the right edge of the sensor plate. It then coasts to a stop along the flat section of the sensor plate. Then LCNC move the axis off the home switch and approaches much more slowly to accurately locate the right edge of the plate.
Finally, I have set a homing offset that then moves the axis as close to the limit switch trigger (the 10mm square higher section) as I could get it to maximise axis travel.
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You can reduce the distance it coasts by slowing the homing velocity down and if you have a heavier axis like a milling machine, it might not coast much at all!
Hakan wrote: You can set up soft limits. Set HOME, MIN_LIMIT and MAX_LIMIT so after homing using the switch, linuxcnc knows where the end limits are and will not run into the switch.
This comment is not really addressing the issue. But yes, you need to set your soft limits so you stay inside the limit switches (eg per the first photo where the axis is right on the soft limit).
Anyway, I thought this was pretty cool original design and it works a treat.Feel free to copy it.
