[Steam-engine] pipe threads Huber

[Andy glines]

Wow! I really didn't expect to get any response on
this one.  I just threw it out there hoping that at
least one person had a little insight to give.  There
have been several great replies to this thread.  I
think that Steve and Mark probably have the best idea
which is single point threading on a lathe.  My very
old lathe does have a taper attachment but between a
well worn machine and an inexperienced operator I
probably better put this one in more capable hands. 
We have three CNC turning machines at work maybe I can
finagle a little "government" work.    

--- steve hall <livesteam at hotmail.com> wrote:

> I had several end caps cast for my old 12HP Huber. A
> local machine shop 
> mounted them in a lathe, bored them and threaded
> them using the lathe. They 
> worked great. Steve
> 
> >From: "Andre' Blanchard" <andre at usermail.com>
> >Reply-To: Steam-engine mailing list 
> ><steam-engine at lists.stationary-engine.com>
> >To: Steam-engine mailing list
> <steam-engine at lists.stationary-engine.com>
> >Subject: Re: [Steam-engine] pipe threads
> >Date: Fri, 05 Aug 2005 16:15:59 -0500
> >
> >At 02:48 PM 8/5/2005, you wrote:
> >>I'm a novice when it comes to pipe threads so i
> need a
> >>little help.  The Huber has a "shock absorber"
> >>aparatus connecting the bull gear to the rear
> wheel.
> >>see it here
> http://groups.msn.com/Racerpics/huber.msnw
> >>  The engine uses 10 shocks and I was missing a
> couple.
> >>  I have had castings made of the caps on the ends
> of
> >>the pipe nipple.  I need to bore them to size and
> put
> >>2" pipe threads in them.  I think that I can
> handle
> >>the boring but I'm unsure about the threads.
> >>Threading these caps should be similar to
> threading a
> >>standard pipe cap.  Will a standard pipe tap work?
> >>I'm afraid that the tap will bottom out before it
> cuts
> >>enough threads.  Is there such a thing as a
> bottoming
> >>tap for pipe threads?
> >>
> >>Andy Glines
> >>Evansville, IN
> >>Steam-engine mailing list
>
>>http://www.stationary-engine.com/mailman/listinfo/steam-engine
> >
> >I have ground the end off pipe taps to do such
> things but I have never 
> >needed to do it on a tap bigger then 1/2.  Cheapest
> 2" pipe tap I could 
> >find was about $95.00 for an import and $121.00 for
> a USA brand.
> >http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=299
> >
> >They do make what they call short projection taps
> for things like what you 
> >are talking about, they are, of course more money.
> >http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=301
> >
> >Are you sure the threads are tapered?  I guess if
> you have had some cast 
> >you have looked them over fairly close.
> >
> >Any female tapered pipe threads we do at work
> larger then 3/4" we usually 
> >end up single point milling in a CNC, but then they
> are usually in some 
> >nasty block of stainless.


Andy Glines
Evansville, IN

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