Re: g320 or g340 for mill setup?

I picked up some motors off ebay that came off a bridgeport, rpm is
2500 no load, 5" dia . I have new ballscrews .200 lead

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> sparkness2001 wrote:
>
> >Heres my deal: cnc for a 10 x 40 american knee mill.
> >Im at the point of selecting timing pulleys, encoders and gecko
> >drives. I have .200 lead X & Y.My thought on setup is as follows:
A
> >2:1 pulley ratio, 250 cpr quadrature encoder,gecko g320 and
mach1/2
> >nc software. my calculations tell me 1 pulse = .0001" so at 25khz
I
> >should get a rapid of 150. is this resolution too high? should I
use
> >step multiplying or diferent encoder combo ? Any input would be
> >appreciated.
> >
> >
> What about motors? The motors you have determine everything else.
if
> you haven't
> gotten the motors yet, hold off until then, as it may affect
everything,
> but most especially
> the sprocket sizes. If you have high-torque, low-speed motors, you
will
> only want a
> small belt reduction ratio. If you have lower-torque, high-speed
> motors, you will
> need a greater reduction ratio.
>
> Do you have ballscrews? If not, the inefficiency of the Acme
screws
> needs to be taken
> into account. What linear force do you plan to develop with this
> machine? What
> spindle taper, speed range and spindle HP do you have?
>
> Jon