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OK, that's probably to be expected since there does not seem to be any B axis home switch
and you have setup a homing scheme that requires that switch.

If you don't have a home switch on B, and you want to home to index, you need to setup
Index-only homing:

linuxcnc.org/docs/html/config/ini-homing.html#_configuration


 

my configuration works very well on the x,y,z axes with on/off switches. homming is all done at the same time without any problem. the problem is only on this rotary axis where i have an encoder with which i want to use the Z phase to do my homing.