[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
>
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