Re: Driving a Bridgeport Knee

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...> wrote:

>
> I was wondering if this was feasable also, if my machine wasn't
> buried under a ton of stuff i would investigate further. While i do
> not have any answers i do like hearing your ideas or anyone elses on
> the subject. One thing i am affraid of with usaual methode of
> driving the knee, is breaking the bevel gear with to much
> horsepower...
>
> Wally
>

I really am resistant to driving through the bevel gears as they
are very sloppy. I also like to be able to move all axis by hand
should the need arise or for the "quickie" machine job. My machine
is currently completely apart for a rebuild, and I can see no reason
why this won't work. Just can't bring myself to drive through
the damn bevel gears....

Scott

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
> <polaraligned@o...> wrote:
> >
> > I am thinking about driving the knee with a pulley just below the
> > bearing on the Z-axis leadscrew. I would machine the leadscrew down
> > to accept the pulley. The motor would be mounted on the side of the
> > knee, and to get the timing belt out I would cut a rectangular slot
> in
> > the side of the knee.
> >
> > Advantages:
> > Motor is out of the way.
> > I can still use the handle to move the knee via the bevel gears.
> > (can't leave the handle permanantly attached!)
> >
> > Disadvantages:
> > Lose about 2 inches off the bottom of the knee travel
> > Changing belts would be a real pain in the you know what.
> > Permanantly alter the knee with hole (which does not bother me)
> >
> >
> > I think the motor will have no problem with clearances.
> > Does this sound good? or am I missing something.
> >
> > Scott