Re: Hexapod question

Ball joints will work, but only if you spline the strut pieces to each
other so they can extend but not rotate relative to one another.

If you're using a motor, screw and nut in the strut, you have to keep
the top from spinning relative to the bottom. You can use U-joints and
a simple threaded strut, or ball joints and a more complicated strut.
I assume that the machine posted here uses simple threaded struts.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...> wrote:
snip...
>
> Several commented that ball ends would rotate, making extension
> impossible, or impractical. Just ain't so. Any more than an actuator
> has wildly spinning ends because of the ball or acme screw turning
> within...
>