Stepper Motor or Servo Motor Requirements for my Van Norman #12 mill?

Can anyone tell me what size minimum motor I will need to add CNC to my full
size Van Norman Model 12 milling machine? Can I use a 150 oz-in stepper and
gear it
down or will this be too slow or just too small? (Can you tell I have these
already in stock?) I suspect I will need a much larger servo motor? Thanks
for any input....

R. William Kichman, P.E.
Kichman Engineering Associates
103 Old Furnace Road
Cornwall, PA 17016-0643
tel/fax 717/270-0714

----- Original Message -----
From: "Bill Kichman" <billkichman@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, April 30, 2003 2:23 PM
Subject: Stepper Motor Requirements?


> > Thanks for any input.Can anyone tell me what size minimum motor I will
need to add CNC to my full
> size Van Norman Model 12 milling machine? Can I use a 150 oz-in and gear
it
> down?
...
> Bill K
>
> ----- Original Message -----
> From: "turbulatordude" <davemucha@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, April 30, 2003 12:48 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Rotary table for CNC mill
>
>
> > I am not sure I understnad the gap question.
> >
> >
> > If you put a hole in the center and cut your way to the ID of the
> > ring, it would meet and ID in a slope. You should be spinning the
> > table all the time so there is no pause. then at the end of the cut,
> > the table moves so the cutter is free from the edge.
> >
> >
> > If you start/stop or pause with the cutter in contact with the finish
> > surface, it is likely that you will leave a tooling mark.
> >
> > Dave
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "los_pachecos2002"
> > <pacheco_americo@h...> wrote:
> > > I recently purchased a rotary table with the intention of
> > > prototyping rings. I have made several unsuccessful attempts at
> > > cutting a ring.
> > >
> > > The table will cut the ring the full 360 degrees. There is a slight
> > > gap on the bottom portion. Is there anyone who can offer some
> > > information in using the rotary table successfully?
> > >
> > > I have made several adjustments as far as increasing the
> > > circumference of the design in the 2D drawing. The problem is if I
> > > increase the cir. the ring size will be altered.
> > >
> > >
> > > Americo
> >
> >
> > Addresses:
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