[modeleng] Re: coarse threads

Let's see if I have this straight in my mind: 26 tpi
BSB threads are for Gas and 27 tpi are for Water
Pipes?  Right?

Al Messer
--- Jeff Dayman <jeffdayman@xxxxxxxxxxxx> wrote:

> They did it so folks couldn't easily connect gas to
> water etc.
> 
> Cheers Jeff Dayman
> ----- Original Message ----- 
> From: "Jesse Livingston" <fernj1@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, January 27, 2007 6:23 AM
> Subject: [modeleng] Re: coarse threads
> 
> 
> > Here, 27tpi is used for, or used to be used for
> brass pipe gas threads.
> >  Our pipe threads are 28 , 19, 14, 11 tpi
> according to size.
> >  Alan Stepney
> >
> >
> > Alan et al,
> >
> > Wonder why they went from 27 tpi to 28 and why did
> some idiot come up with
> > the 27 thread idea in the first place?  I have cut
> 27 tpi on my Atlas
> lathe
> > once upon a time, but I had to do it the same
> sneaky way I do when I cut
> > metric threads on Imperial geared lathes.  I have
> no idea why I needed 27
> > tpi since my lathe has no taper attachment and it
> would have been a
> tapered
> > thread or so I would think.  I have a taper
> attachment on the 14" Rockwell
> > lathe out in the back shop and have used it to
> make oversized pipe plugs
> for
> > a friend's steam traction engine.  One or two of
> the 2-1/2" pipe cleanout
> > plugs in his firebox had been in and out so much
> that the threads had
> > stretched/worn enough the regular pipe plug was in
> danger of screwing all
> > the way into the water leg.  An extra long plug
> took care of that and
> boiler
> > passed the Kentucky boiler inspector hydro test
> OK.
> >
> > Red Neck Jesse in Tennessee
> >
> >
> > MODEL ENGINEERING DISCUSSION LIST.
> >
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> >
> 
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