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. > > > > To UNSUBSCRIBE from this list, send a blank email > to, > > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the > > subject line. > > > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject > line. > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.15.25/593 - > Release Date: 19/12/2006 > 13:17 > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject line. > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.