[modeleng] Re: BA/ME Thread Query

People who use such tiny taps must have nerves of
Steel, and a eye-to-hand co-ordination that is almost
beyond belief.  Break them?  I can barely see them!

Al Messer

--- Alan Stepney <alan@xxxxxxxxxxxxxxxx> wrote:

> They were mainly for watches as were other miniture
> threads. Other uses were 
> instrumentation.
> Whitworth goes down to 10 thou OD.
> Waltham and Thury also have threads in that range.
> 
> Heck, I bet the taps break when you look at them!
> lol
> Alan Stepney
> 
> http://www.alanstepney.info
> Model Engineering & steam engine information pages
> ----- Original Message ----- 
> From: "Bede McCormack" <bede@xxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Friday, December 22, 2006 7:29 AM
> Subject: [modeleng] Re: BA/ME Thread Query
> 
> 
> Recent searches for thread types turned up a list of
> BA threads that
> went all the way to 25BA with a tpi count of several
> hundred if I
> remember correctly (can't find the list again of
> course!).  Surely this
> must be a theoretical fastener, unless
> nanotechnology has found a use
> for it?  I imagine even the most cross-eyed
> watchmaker would be hard
> put to thread that one...
> 
> But just out of curiosity, is anyone aware of a use
> for such a
> miniscule screw?
> 
> Bede McCormack
> Brooklyn
> 
> 
> On Dec 20, 2006, at 2:41 PM,
> peter.chadwick@xxxxxxxxxxx wrote:
> 
> > It seems to be the season for finding strange
> threads. I went to use an
> > Italian made  variable capacitor this afternoon.
> No nut for the
> > mounting
> > thread. Investigate, and the damn thing is 11mm
> diameter, 1mm pitch!!!
> > That's not in any table I've
> found.................
> >
> > Gave up. Spent 2 hours in turning etc to make a
> new bush, threaded
> > 3/8-32tpi and suitably bored to make a seating for
> the ball bearings. A
> > very moot point whether or not making a small
> enough boring tool to
> > cut an
> > inside thread to fit would have been quicker. With
> my standard of
> > workmanship - most unlikely!
> >
> > Peter Chadwick
> > Swindon
> >
> > MODEL ENGINEERING DISCUSSION LIST.
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