re:re:Cnc router help

Smoke,

Yes. The mount for the ballnut is fitted with bearings (2 sets, in a
fixed or rigid mount style. The bearing IDs allow the ballscrew to
pass thru. An incorporated timing belt drive then spins the NUT,
while the shaft (which can now be smaller/cheaper) is stationary. You
are correct that in this case, the motor moves with the nut. Using a
shaft to drive the nut would eliminate much of the reason for doing
it this way to begin with,IMO...

Hope this helps.

Ballendo

>Ballendo, I presume your idea is to fix the ends of the ball screw
>(or at least one end anyway) when spinning the ball nut. How are
>you spinning the ball nut? (I'm enquiring about the mechanical
>connection here as it would appear the drive motor will either need
>to travel along with the nut<snip>
>Smoke