Re: boring a timing gear (update)

Mike,

Gt is a modification/variation of HTD. IMO, like Coke and Pepsi (one
IS slightly better, but MY preference will go un-named as to cola<G>)

It's been awhile since I needed 5mm Gt/HTD , but I've always been
able to get them from an industrial distributor; i.e., Bearing house.

I think even Boston Gear has 'em...

Hope this helps,

Ballendo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Mike Gann <mikegann@p...>
wrote:

> 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
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
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