2 steppers on one axis 5i25 - 7i76

If you don't have the home/limit switches installed yet, I believe you'll need to have it configured more like this:

3.13. Immediate Homing
If a joint does not have home switches or does not have a logical home position like a rotary joint and you want that joint to home at the current position when the "Home All" button is pressed in the Axis gui, then the following ini entries for that joint are needed.

HOME_SEARCH_VEL = 0

HOME_LATCH_VEL = 0

HOME_USE_INDEX = NO

HOME_SEQUENCE = 0

HOME equals to HOME_OFFSET


From the 2.8 doc: linuxcnc.org/docs/devel/html/config/ini-homing.html


Added -- I'm not sure but you might need the Y joints to have HOME_SEQUENCE at -1 to synchronize the joints. I haven't been in your current config before, so it's not a combination of settings I've experimented with.

For the two gantry joints you definitely need
otherwise LCNC won't know they are joined together.

I found it was prudent to home the Z (HOME_SEQUENCE = 0) before X (HOME_SEQUENCE = 1) to lift the Z up away from anything fixed to the table before homing the X

Yup, that was it. I have attached my .hal and .ini files.

I made the HOME_SEQUENCE for the X and Z equal to 0. The Ys got -1.

Time to come up with some cool proximity sensor brackets. I will probably mess around with my spindle too.

Thanks guys for all your help.

Just be aware that the home switches need to stay closed until the axis slows to a stop. I allowed 100mm for this and came up with a combined home/limit switch accuator


The home prox sensor senses the lower flat plate and the limit prox sensor is mounted higher so it is triggered by the 10mm block welded on.

Congrats on the milestone!

Just a big Thanks for the same problem I was dealing with. I'm about a Month behind you, but this sure helped me get past a complex part of LinuxCNC