Re: 3D router Rack and Pinion or Ballscrew

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

>
>
> dakota8833 wrote:
>
> >
> >I had built a router that is using a 6 ft by 3/4 inch acme screw

from

> >Nook. It has a pitch of .2 and I can run at 2 inch a second with no
> >trouble. But I did notice a vibration, which turned out to be side
> >play in the nut. Greasing it only helped for a few minutes. I

ended up

> >making a coller to remove this play. All is well now. Anyone else

have

> >this happen ?
> >
> >
> Using a 6 foot 3/4" screw is really on the edge of disaster,

especially

> with the
> velocities a router requires! That is way above critical speed in

most

> cases.
> The screw tends to whip around.
>
> Jon

I did a 10 foot long 1/2 screw, but put the nut on the table and spun
the nut.

the problem is that with more than about 17 pounds of force, the
screw starts to bend. not bad for postioning, but there is no
strength for work.

Bigger is better.

Dave