Originally shared by Marcus Wolschon
Presenting DIY desktop CNC Milling during #Easterhegg.
What happens the first day?
It ran too far, spindle blocked and (not having a display) spindle controller signaled an overcurrent via smoke signals.
With a new fuse I can now still run it but no longer control the speed or stop the spindle.
limit-switches and e-stop buttons are for wimps?!
It ran into the mount.
No limit switch would prevent that.
I hit the e-stop but the blocked spindle already tripped it’s fuse and gave smoke signals.
I wonder if we could use a arduino board and a few strain gages (or maybe just current sensing) to do a auto E stop… hmmm
It’s not the steppers, it’s the spindle.
It was a very big 2 flute cutter. One of the flutes hit the mounting and stopped the spindle. The motion could have continued for another 3mm while the spindle driver was already smoking.
What WAS missing was an overcurrent protection in the spindle driver.
My large CNC uses a VFD. The #TravelCNC uses a 230V DC spindle with a very trivial controller.