Lathe Z axis/joint not homing after updating to 2.8

I have JOINTS=2 and COORDINATES= X Z in my lathe and that works fine. There was a change when moving to 2.8, don't remember exactly but it was along the lines that a Y axis needed to be defined but not used. In 2.8 that isn't needed anymore. Two joints refered to as JOINT_0 and JOINT_1, and AXIS_X and AXIS_Z.

try this:

Chris M

Did you make this config with pncconf in 2.8 or did you convert it from 2.7?

Thanks

I converted from 2.7, it was working fine there.

Ok that makes sense - things have changed a bit in 2.8.
Changing things as above should fix it.
We probably should add an error if [JOINT] sections are missing.

Chris M

cmorley wrote:

try this:

[TRAJ]

COORDINATES = X Z
LINEAR_UNITS = mm
ANGULAR_UNITS = degree
DEFAULT_LINEAR_VELOCITY = 2.50
MAX_LINEAR_VELOCITY = 25.00

[KINS]

KINEMATICS = trivkins coordinates=xz
JOINTS = 2

Chris M

CHris, I can't see that will work out of the box becasue he will have wired his lathe in 2.7 to the Z (joint2) axis so your solution puts the Z axis on a different stepgen. SO he would need to rewire.

I think lathes have been overlooked with the joint axis and if its not properly resolved this will be very wasteful of resources once more and more people move to V2.8

Oh yes you are quite right - he will also need to change the ini and HAL file to change all [JOINT_2] to [JOINT_1]

Yes I anticipate the masses converting from 2.7 to 2.8 will have some problems.
Andy's script for conversion probably covers 90% - maybe we can catch this with that.

I have also started to consider whether an INI validation would be useful/possible.
I have used a basic version of that with my panelui project.

But I good error message would have brought this in light more quickly.
But good eyes you have there Rod!

Chris M

Chris, I think what this shows is that the so called independent (joint) axes is not independent as you can't skip a nonexistent joint (as you need to on a lathe, unless its like my manual one where the DRO is marked for X & Y! )

I don't know how hard it would be but perhaps the trivkins coordinates string needs another NULL item so you could do something like thisWhich would be an instruction to skip joint1

Changing joint_2 to joint_1, got the job done.
Thanks guys!