The Mrs aint gonna be happy about this little project!

[JAZZCNC]

Ok am I getting this correct your trying to jog 2 motors on same axis at same time independently and keep them in sync.? . . . To be honest If connected to gantry your just asking for trouble and bent ballscrews.!!!. . . . Anyway are you sure your not just stalling the B motor by racking the gantry or axis.?

If the B axis just moves in one direction intermittently then I'd check you Dir connection at the drive it could be loose.!!

You could have dodgy keyboard. To test if things are ok try using MDI commands for each axis if they move ok with G-code commands and they move with pendent then chances are key board is playing up.? The pendent will use the same Axis commands the keyboard does so to mach it's no different, they are just key press's.

Have you tried removing pendant and see what happens.? They could be clashing.??