Dynomotion Forum

I had a weird issue today. I recently upgraded to 4.35f, this was my first time running it. Every time I would set Z zero for G54 with a previously measured tool, then switch to another tool my Z zero would be off by a considerable amount (> .2).

I went through the entire process multiple times to make sure it wasn't me:

Set t19 length using my dial indicator tool setter
Set t23 length
Use t23 to set Z zero on my part
Switch to t19, Z zero is now off significantly
Switch back and check with t23, Z zero is off the same amount.
verified without physically changing the tool out or moving the Z axis at all that the same thing happened. (set t19 length, set Z zero using t19, switch to another tool via the menu while leaving t19 in the spindle and the Z axis in the same spot, switch back to t19 via the menu, Z zero is now off)

The tool lengths were correct after re-measuring them.

Eventually I rebooted the PC and cycled power to kflop/kanalog. The problem vanished.

Any idea where to look for potential issues? This kind of a scary one to have randomly pop up; I am running the program now and verifying zero is still correct after every tool change.

I'll respond when it is finished and attach my toolchange program and tool height set program

Strange. I can't think of what might cause such behavior. I think the way I would approach it is to break it down to see what changed before/after the shift. There is the machine coordinate and 3 offsets: (G52/G92), Fixture, and Tool. They should have this relationship (with Tool length Compensation on):

Machine = DRO + G52 + Fixture + Tool

or

DRO = Machine - G52 - Fixture - Tool

ToolChange1.c (m6)
ToolTableSetRev1.c (user button to set tool height as distance from home)

Tools are jogged down to a dial gauge type tool setter with a 4" gauge height.
Z zero is set with the same setter and then 4" is subtracted.