Re: mini-mill converson data kit ?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, ccq@x wrote:

> On Mon Jun 30 04:03:49 2003 kdntool wrote:
> >
> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> ><davemucha@j...> wrote:
> >> Hi,
> >>
> >> I am looking for data on converting a mini-mill to steppers.
> >>
> >> can anyone offer some links ? or recomendations on stepper

sizes ?

> >>
> >> I was thinking of starting with some NEM34's 150 in-oz because I
> >have
> >> them and could always swap out for larger units.
> >>
> >> Also, what is the best way to automate the Z axis ?
> >>
> >> Dave
> >
> >Dave,
> >I just finished the conversion on a "Grizzly" type with the R-8
> >spindle. A ball screw for the Z-axis is the only way to go. I am
> >running a 180oz NEMA 23 with a 2:1 pulley ratio. Direct drive on

the

> >X&Y axis'. Rapid rates are 24 IPM--Z and @13 IPM X&Y.(until I ball
> >screw them as well)(would also improve with higher voltage drives)
> >Not finished fine tuning EMC yet so they might get even better! I

did

> >a jig for work with it: 1st piece:50 holes .035 DIA, 5/16" THK

6061,

> >w/ 2 .187 dowel holes 2nd piece: 50 holes .024 DIA, 1/8" THK O-1
> >flat ground, w/ 2 .187 dowel holes. I used solid carbide "circuit
> >board" drills with the spindle running flat out, no broken drills
> >even with the "slow" spindle speed. Had to "peck" .015" deltas
> >through the O-1. Both pieces line up perfect. I will be going to
> >market with the retro kit soon if you are interested? Just waiting
> >for another saddle to arrive so I can finish the ball screws for

the

> >X&Y.
> >Good Luck with your upgrade it yields a nice little cnc for small
> >parts.
> >Ken
>
> Yo Ken;
>
> Are you talking about a conversion kit for the mini-mill? If so,

what are the

> details?
>
> Bill
>

Yes let me know when it is available.

I hope you have a site up soon too.


Dave