Re: [CAD_CAM_EDM_DRO] Re: boring a timing gear (update)

What about the GT pitch?

It is supposed to be better than the HTD.

Anyone have any sources for GT pitch timing pulleys in sizes
reasonable for a full size mill retrofit?

I have two 5mm GT pitch 28 groove pulleys. I have been trying to save
some money by locating two 5mm GT pitch 56 groove pulleys to use with
the two I have for a 2:1 belt reduction.

I have contacted any mfg I could find on the net. All say they can make
it, but don't stock it. Stock Drive products lists it as stock, but they
don't have it in "stock" - 5 week lead time.

Mike


"ballendo " wrote:

>
> Dave,
>
> Friends don't let friends use xl pulleys<G>
>
> Ballendo
>
> htd,htD,hTD,HTD.
>
> P.S. have you thought about making a new hub which could include a
> thin larger diameter disk which could be pinned, riveted, or glued
> (single shear-like)to the existing nylon web? simple lathe (or CNC
> mill) job...
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude
> <davemucha@j...>" <davemucha@j...> wrote:
> > UPDATE,
> >
> > I bought a 24 tooth nylon gear (XL) with aluminum hub that was 1/4
> > inch bore.
> >
> > I drilled it out to 3/8 and while trying to push it on the shaft,
> it
> > was a tight fit, not a press fit, the nylon seperated from the
> > aluminum hub.
> >
> > I would expect that my first load on the unit would have been that
> > much force so that don't work.
> >
> > I think I'll get a solid pulley and just use that.
> >
> > McMaster only lists 1/4" ID's, anybody know who offers a good price
> > on 3/8 bore XL pulleys ?
> >
> > Dave
> >
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>
> wrote:
> > >
> > >
> > > turbulatordude wrote:
> > >
> > > >I have a 24 tooth nylon timing gear that has a 1/2 dia aluminum
> > hub
> > > >thru the center and a 1/4 inch bore.
> > > >
> > > >I'd like to open it up to a 3/8 bore to fit my NEMA34 single
> stack
> > > >stepper to drive a 72 tooth pulley on my drill press.
> > > >
> > > >The setscrew is in a hub that is 0.875 inch dia so the screw
> will
> > > >have enought grab.
> > > >
> > > >I am not sure if the 0.062" wall is too thin.
> > > >
> > > >
> > > It depends on how much of a load you are going to put on it. If
> it
> > will
> > > be lightly loaded
> > > (by the setscrew, belt torque, and belt tension) it should work.
> > If you
> > > will be running it hard,
> > > it may swell the remaining hub and eventually cause the Nylon to
> > crack.
> > >
> > > Jon
>
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