Re: greetings

--- In CAD_CAM_EDM_DRO@egroups.com, Ray <rehenry@u...> wrote:

> > Message: 22
> > Date: Sun, 17 Sep 2000 00:24:31 -0500
> > From: Dan Dowell <dandowell@s...>
> >
> > This is my first post on this group. Im really new at

machining. I hope I get something out of this. I have a 7x10 mini
lathe and a grizzly mini mill.

> > I would like to at least put some ball screws and dro's on the

mill.

> > Is there any one on this list who has a Grizzly mini mill or the

equivilent who has made these modifications to their mill???

> > I think that CNC stuff is a little over my head right now. But I

would like to figure out the others.

>
> Dan
>
> Dan Falck and I have been working on a "kit" to run ball screws on

the

> 8689 Grizzly. We should have mounts and screws complete in a

couple of

> weeks.
>
> IMHO - You don't want to run ball screws with manual milling

because the

> table will run away if you take your hands off the cranks. The acme
> threads have enough resistance to cutting forces transfered to the

bed

> that they will not run away but the ball screws do not! You can

tighten

> the brakes some here but that's risky.
>
> If what you want is dro, I'd suggest linear scales, rack and

pinion, or a

> wire driven encoder, and one of the computer dro systems talked

about on

> the list.
>
> Ray

Ray,will that be a zero backlash ballscrews?I just finished the retro
on mine and had the same idea on a "kit" to retrofit the minimill.the
good thing about using ballscrews is that ones can use smaller
motors.I'm using size23 motors rated at 80oz direct drive.