How to. 2 or more motors on one axis. Gantry

This looks new

as I said before remove or adding kinstype=b or BOTH won't do much - XZ, with parameter I see 4 joints, and without i see 3 axis. Homes in both modes same. One of the Y axis trying to go way way after limit. Log is slightly different without kinstype=b (attached log of run both options with kinstype and without).

This sounds like the home switch is not connected to the right pin or the homing direction is wrong. I've been caught with similar issues heaps of times...

rodw wrote:
This sounds like the home switch is not connected to the right pin or the homing direction is wrong. I've been caught with similar issues heaps of times...

+1
And yes, when using tandem axis ( two motors for the same axis ) LinuxCNC is always in joint mode until homed, then it switches to world mode.

rodw wrote: This sounds like the home switch is not connected to the right pin or the homing direction is wrong. I've been caught with similar issues heaps of times...

It is impossible that connection is wrong. I've checked many times that both Y joints connected in right pins. Checked signals and joints status - all match (home-y1 -> joint1, home-y2 -> joint2 and etc).
I had even switched Y home switches (home from Y2 connected to Y1 pin and vice versa) behaviour is same destroying-full (already smashed two sensors).

Home direction - while homing both axis comes in right direction to home switches. All of my axis have sensor connected at same side of motors. And it's works in XYZ mode just perfectly.
Frankly I don't understand one thing: all my sensors is at same side of motors, Z axis configured as -205 to 0 and search vel is positive, X axis 0 to 610 and search vel is NEGATIVE, Y axis is 0 to 1005 but search vel is POSITIVE. Where is a logic?

tommylight wrote:

rodw wrote:
This sounds like the home switch is not connected to the right pin or the homing direction is wrong. I've been caught with similar issues heaps of times...

+1
And yes, when using tandem axis ( two motors for the same axis ) LinuxCNC is always in joint mode until homed, then it switches to world mode.

Tommy, I don't think that is always the case. what happens with your beloved axis if you delete kinstype=both? Joint mode is banned from my Gmocappy config and I never see joints. And why would you bother with joint mode?

Have you tried with a negative latch velocity on JOINT_1 and JOINT_2

Actually, when I think back, I had similar issues and reduced all of the various homing velocities to be super slow (say 10%-20% of whatever you are using now. That lets you see whats going on...