Machsupport Forum

Mach Discussion => Mach4 General Discussion => Topic started by: walkman on July 12, 2023, 10:38:07 PM

Title: ATC Y-axis won't go to negative value
Post by: walkman on July 12, 2023, 10:38:07 PM

Greetings!

I have an AvidCNC with auto tool changer. My tool rack is attached to the very front of the machine. To make room for the tool rack I moved the spoilboard forward to Y=434. I wanted the machine coordinates for the X and Y axis to be 0,0 at the spoilboard instead of at the front of the machine frame where the rack is attached so I offset Y-axis homing value to -434 such that when I home the machine Y=-434 instead of zero.

After doing so, when a tool change starts the Y-axis moves to +108.00 instead of moving to the assigned negative Y value to the rack that I assigned. No matter what negative Y value I assign to the tool it still goes to Y: +108.00 every time but the X and Z axis move to their intended positions.

I'd appreciate any assistance to make this work. Thanks!

Title: Re: ATC Y-axis won't go to negative value
Post by: Graham Waterworth on July 13, 2023, 05:52:41 PM

Have you got soft limits turned on?

Title: Re: ATC Y-axis won't go to negative value
Post by: walkman on July 13, 2023, 07:18:42 PM

Yes, but the spindle does travel to all areas and works normally unless it is instructed to change tools. The problem exists only during an automatic tool change operation.

Title: Re: ATC Y-axis won't go to negative value
Post by: Steve Stallings on July 14, 2023, 11:22:09 AM

Could it be a case of "work coordinates" vs. "machine coordinates"?