Re: [CAD_CAM_EDM_DRO] Ballscrew Sizing

C.S. Mo wrote:

>I'm trying to figure out what size ballscrew to use for converting the
>quill feed on a Comet (Taiwanese Bridgeport clone) milling machine. The
>stroke is 5", 3hp spindle. I'd like to use 5/8" diameter for cost and
>space reasons, but I'm thinking that I might need to go to 3/4". Anyone
>have any comment on that?
>
>

On the Bridgeport power feed, the overload clutch is set for 200 Lbs
linear force. So, I think a 5/8" ballscrew should be fine. That is roughly
the size I'm using, and it seems quite solid. It seems Bridgeport's own
ez-trak machines use a screw this size.

>Also, any recommendation for size of servo? I'm figuring that I can use a
>smaller servo than for the x/y, but how much smaller?
>
>

it depends a bit on the work, speeds you need, etc. With appropriate belt
ratios, a 100 Oz-In motor should be plenty.

Jon