I have purchased a 4 axis CNC grinder by the company Kaindl in Germany. It uses a Linux CNC program. My problem is that I am unable to home the machine in all 4 axis, it homes fine in X Y & Z axis but not A axis.
Did you try manually homing the A-axis? Often rotary axis don't have home switches, and are homed arbitrarily. This might mean that it does not home with the home all button and may need to be homed by it's self. (Just a guess, I've never played with such a configuration.)
If that is not the case, does the A have a home switch? a limit? are they working correctly? Can you jog the A-axis?
Looking at the instruction manual on their web page:
kaindl.de/en/fsm.html
They seem to be using a very old version of LinuxCNC and one of the less-developed GUI interfaces.
There might be advantages in updating both. But also risks and difficulties.
