Re: [CAD_CAM_EDM_DRO] What size ball screws

skunkphallus wrote:

>I am currently modeling my mill drill up in I-Deas V11.0, this is a
>legal takehome version. Anyway, I want to convert to ball screws,
>but don't really know what size. The original screw, which I think
>is an ACME screw, is about 1" diameter. Does anyone have any good
>ideas or reasons that I should use a certain diameter ball screw?
>My mill/drill is the typical R31 complex machine style.
>
>

I would think a 3/4" screw sould work, and a 7/8" screw should be fine,
on a machine this size. If the far end of the X axis screw is unsupported,
then the 1" might be a better idea, though.

The three things determining this is maximum unsupported length,
maximum speed and maximum axial load. You want to avoid bowing
of the screw under compressive load and whip at high speed.

Jon