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

Don't have my catalog in front of me, but I Grainger sells them in many
sizes and there is probably one in your city. They may not be in local stock
though, takes a couple of days to get them. I have bought from them before.
They do have 3/8 bore sizes, but the size and type you need may require
boring. Search for XL pulley
http://www.grainger.com/Grainger/wwg/start.shtml

Bill

----- Original Message -----
From: <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, January 29, 2003 9:47 PM
Subject: [CAD_CAM_EDM_DRO] Re: boring a timing gear (update)


> 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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