"Lloyd E. Sponenburgh" wrote:

Jon Elson fired this volley in
:

If you want to link 3 axes to move, as "electronic gearing" to
something else, with specified ratios and offsets, this can be done in
HAL.


Yes, that would be it, Jon.

I have to find some hollow encoders... the work must pass through the
spindles.

Hollow encoders are extremely common, your issue will be if you need a
large bore, in which case your best bet will be a large timing belt
pulley around the spindle and belt drive to your encoder.