Version 2.8 Dual Motors XYZX

I have been running 2.7.12 for a while and installed another motor, Pseudo Servo for the Xaxis. I have struggled to understand how to add this into the system, and via articles by kunema, had opted to go to version 2.8. It took a few configs, but I think I have 2.8 running. It jogs Joint 0,1 and 2. However, if you notice, my KINEMATICS is set to XYZX. I had set up Joint 3 to be my X2, and it looks right. However, Joint 3 won't move. ( Pressing the +,- button moves the DRO value, but no motor movements. )

So, Is XYZX valid? Can the program detect that these axis are moveable? Any suggestions?

I think the following changes in your ini file.

[KINS]
JOINTS = 4
KINEMATICS = trivkins coordinates=xyzx
#kinstype=BOTH
#you don't want kinstype both, unless you want to be able to go into joint mode and jog the two X motors separately

[AXIS_X]
MIN_LIMIT = -39.0
MAX_LIMIT = 39.0
MAX_VELOCITY = 5.70006931284
MAX_ACCELERATION = 5.0

[JOINT_0]

TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 5.70006931284
MAX_ACCELERATION = 5.0
STEPGEN_MAXACCEL = 6.25
SCALE = 4064.0
FERROR = 0.05
MIN_FERROR = 0.01
MIN_LIMIT = -39.0
MAX_LIMIT = 39.0
HOME_OFFSET = 0.000000
HOME_SEARCH_VEL = 0.050000
HOME_LATCH_VEL = 0.050000
HOME_SEQUENCE = -1

[JOINT_3]

TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 5.70006931284
MAX_ACCELERATION = 5.0
STEPGEN_MAXACCEL = 6.25
SCALE = 4064.0
FERROR = 0.05
MIN_FERROR = 0.01
MIN_LIMIT = -39.0
MAX_LIMIT = 39.0
HOME_OFFSET = 0.000000
HOME_SEARCH_VEL = 0.050000
HOME_LATCH_VEL = 0.050000
HOME_SEQUENCE = -1

Still working the home issues out, but thanks for the clarification. Found that I had an "intermittent" connection on the X2 STEP signal in my controller, once I put an oscilloscope lead on it, I got movement. Rectified that quickly. Now dealing with the home issues, but your hints may take care of that. Thanks.

#you don't want kinstype both, unless you want to be able to go into
joint mode and jog the two X motors separately

Incorrect for the master branch when using appropriate *negative* HOME_SEQUENCEs:


Ref:
linuxcnc.org/docs/master/html/config/ini....html#_home_sequence

Ref (Aug 2017):
github.com/LinuxCNC/linuxcnc/commit/a46e735538

Note: For some configurations that use negative HOME_SEQUENCEs but
require joint jogging for special situations, see:

linuxcnc.org/docs/master/html/config/ini...l#_inhibiting_homing