On Feb 24, 8:28*am, Karl Townsend
wrote:
...
I did some preliminary layout for initial design of how to do this. it
will work best to rigidly mount the ball screw and spin the ball nut
with the nut located right at the bottom of the knee sitting on a
taper bearing.

Anyway, with this layout it would be all but impossible to change out
a timing belt. You'd have to take the knee apart. (There's always a
design weakness for maintenance)
...
Karl

You can't block up the knee and detach the ball screw?

jsw