soft limits while unhomed

After my recent upgrade to 2.8.0 my machine can no longer be jogged back to the home position upon startup. The controller respects the soft limits even when the axes are unhomed.

My 96x48 gantry router does not have home or limit switches, On startup, I return it to x0y0 by manual jogging (for reasons of material handling, I rarely shut the machine off in the 0,0 position) but my soft limits (x+97,-1) and (x+49,-1) prevent it from moving more than one inch back to the lower left corner of the bed.

Desired behavior: allow manual jog - ignoring soft limits - when axes are unhomed.

Can you please help me with the necessary config change?

Change your limits to +- the axis travel.

JT

It defeats the purpose of soft limits if I specify 192" of acceptable travel on an axis 96" long.

Is there no way to recover the functionality of the previous version? (jogging is subject to soft limits only after homing)

I'll ask the developer that did a lot of work on the joint axes branch into master. In the mean time G53 G0 X0 Y0 before shutting down will keep you going. I did verify that on 2.7 you can jog past the soft limits and I confirmed that the behavior has changed in master.

If you can start an issue at github.com/LinuxCNC/linuxcnc/issues that would help.

JT

Bug report submitted.
Fwiw the user docs describe the expected behavior
www.linuxcnc.org/docs/2.7/html/user/user-concepts.html#_homing

That is the 2.7 docs not the master docs.

After spending some time testing and talking to a developer it is indeed a "feature" of master. I assume you went to master to get some feature that only master has? Are you starting up in "joint mode" then switching to "world mode"? Well it seems like you can't go into world mode without homing so I'm really confused now.

The question I now have are you moving the gantry by hand with the power off? Axis remembers the last position and stores them in postion.txt in your config directory. So on power up you should be able to jog the axis back to the 0 position.

For some reason you can only jog joints in master past the soft limit... I can't understand why you can't jog an axis but the developer gave me a lengthy explanation which I do not fully understand. If you could select more than one joint that would solve the issue.

Please describe in detail what you do after power up and attach your ini file.

JT