[modeleng] Re: Mystery Thread & New Loco
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 15 Aug 2006 06:20:27 -0700 (PDT)
Hubert, I have been cutting threads on a lathe for
around 35 years, but it is still a "hair raising"
event when it happens.
For the past several years, especially when threading
to a shoulder or doing an internal thread, I grind the
tool "backwards, mount it where it is in the "back
side" of the hole and thread in Reverse with the
spindle turning in reverse, with the threading tool
backing out of the hole towards the headstock. Since
my lathe has a threaded spindle, I do this very
carefully, very carefully indeed!
Al Messer
--- Shep <shep.28@xxxxxxxxxxxx> wrote:
> Al
>
> The 1000 rpm top speed was the suggesion of the
> lathe manufacturers - not
> the speed used by me! On cutting very short
> screws in times past, I used
> to turn the lathe by hand, to avoid 'sweating
> marbles'! Because the
> Hardinge has a positive stop, I now do these under
> power, but still at a
> modest speed - this is easier on the nerves!!
>
> Cheers! Hubert
>
> ----- Original Message -----
> From: "Allen Messer" <al_messer@xxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Tuesday, August 15, 2006 1:27 AM
> Subject: [modeleng] Re: Mystery Thread & New Loco
>
>
> > Screwcut at 1,000 rpms? No way for me! I'm not
> that
> > experienced! I always use bottom back gear and
> then I
> > sweat marbles until the job is finished.
> >
> > Al Messer
> >
> > --- Shep <shep.28@xxxxxxxxxxxx> wrote:
> >
> > > Barrie
> > >
> > > I find the easiet way to screw-cut is to stop
> the
> > > lathe at the end of the
> > > cut, withdraw the tool, and reverse the lathe -
> in
> > > this way whatever the
> > > thread, it is always on track.
> > >
> > > I bought an ancient Hardinge last year, and with
> > > this lathe, screwcutting at
> > > speed is a doddle! You can thread up to a
> > > shoulder, and the lathe will
> > > stop.
> > > The topslide has a device for withdrawing, and
> the
> > > reverse on the
> > > screwcutting does not lose the track Hardinge
> > > suggest that you do not
> > > screwcut above 1000 rpm!
> > >
> > > Cheers! Hubert
> > >
> >
>
>
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