Re: Driving a Bridgeport Knee

Well for what it is worth, the people i talked to about driving with
bevel gears said to shim them and take out the backlash.

Wally


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@o...> wrote:

>
> --- 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
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> > --- 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