Reaching out to the gurus when it comes to GRBL and setting up a new machine. I’m posting this in the inventables forum here, but my concern is actually in building a OX metal machine. I don’t think the concepts would change. GRBL allows you to change the homing position datum point of the machine pretty easily, but what about changing the readout? How does GRBL determine where zero, zero, zero is? I get when you first turn the machine on that’s 0,0,0. but after you run a homing cycle, shouldn’t that become 0,0,0? When I zero my machine out to the bottom left datum point, my readout is just the opposite, like -800,-750, etc. I’d like for it to read 0,0,0. If I simply home the machine, turn it off and on, then okay, I’ve got 0,0,0, but if I enable soft limits, the second I tried to move the gantry, it thinks it’s at the far limits of the machine and won’t move.
Is there a way to change the reference zero of the machine? Where does this information come from? The machine thinks that the top right datum point represents zero for x, and y, but where did that information come from and can it be changed?