[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
> 
> ----- Original Message -----
> From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Monday, August 14, 2006 11:57 AM
> Subject: [modeleng] Re: Mystery Thread & New Loco
> 
> 
> > Al,
> >
> > The thread had stripped about 1/2" into the end of
> the tube but the
> original
> > thread was about 3/4" long so I set up the thread
> cutting operation to
> > extend the remaining thread using a tpi of 26. I
> suspect the thread is
> > actually 1mm pitch as the new thread does go
> slightly tight when a collet
> is
> > screwed in more than 1/2". I avoided the metric
> pitch because, although my
> > lathe will cut them, it is not possible to release
> the clasp nut from the
> > leadscrew between passes! I felt sure this would
> result in a catastrophe!
> >
> > Regards,
> >
> >
> > Barrie
> >
> > >
> 
> 
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