JA14 not homing...

It looks like PNCconf has put the homing details in the [AXIS_] stanzas rather than the [JOINT_] stanzas.

If you move the HOME_...... lines into the corresponding JOINT sections it should home.

Is this your gantry, or something else?

I'd say you can't use Pncconf to configure a JA configuration 100%. Check the hal connections for your home switches.

JT

PCW wrote:

Doesn't JA14 use negative home sequence numbers for synchronized homing?

Yes, that's a new feature. You need to look in the scratch docs to find it.
buildbot.linuxcnc.org/doc/scratch/v2.8.0....html#_home_sequence

mjohnsonsa wrote:

So if I understand correctly the whole purpose of the JA14 branch is if you have multiple steppers on a single Axis correct?

That is part of it. It is really intended to do away with the assumption that is implicit in so many parts of the system that there is one motor per cartesian axis, and motor 0 drives axis X. The real drive is to make non-cartesin machines such as robots and delta-type printers a lot less trouble to work with.

Where is the sample code that explains how to configure the dual steppers on an axis to home independently?.

There is a snapshot of the Joints_Axes documentation here:
www.linuxcnc.org/docs/ja/html/
However this was taken just before tandem homing was introduced, so that isn't described there.

However those docs do describe how to configure for a gantry:
www.linuxcnc.org/docs/ja/html/getting-st...#_kinematics_modules

And you need to crawl through the buildbot scratch docs to find the tandem homing:
buildbot.linuxcnc.org/doc/scratch/v2.8.0....html#_home_sequence

But, briefly:
If you start with a normal XYZ configuration you would:
1) ChangetoThat couples X to joint 0, Y to joints 1 and 2, Z to joint 3. Just change the XYYZ sequence to alter that.
2) Make sure that the INI file has Three [AXIS_] sections, [AXIS_X], [AXIS_Y], [AXIS_Z]
3) Make sure that you have Four [JOINTS_] sections. For the XYYZ config the [JOINT_1] and [JOINT_2] sections will normally be identical, except for very frequently having different signs for the step scale.
4) Set up the homing sequence so that the tandem axis joints share the same _negative_ home sequence number. Note that sequence -2 will still run after sequence 1.

Tandem homing will only work if both joints of the tandem axis have home switches and they are connected to the correct HAL pins.