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No need, since 2.8 the joint/axis is implemented in LinuxCNC, so just choose "tandem joint/axis" in the wizard.

?? It is a usual setup, each X-ballscrew having its own stepper and home. For small corrections I could of course use HAL and change the HOME location a bit. The whole X bridge is very solid though (has 20 mm linear rail and two linear bearings on each side, and a profile of 160 x 95 mm aluminium), and pushing manually I cannot rack it more than about 2 mm. I have not measured yet if it is out of line more than that, so I'll do that first, might work. I found the matrixkins source, no mention of dual axis there. Looks modifiable though.
Robert

Hello,
i have a b - axis and i want to home the axis at the same time as the rotorhoming seqence is running (bldc component) 

I run a etel ddm with a 8i20 and a siko encoder with index

Any ideas?

Thanks