[modeleng] Re: BA/ME Thread Query
- From: "Alan Stepney" <alan@xxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 19 Dec 2006 04:46:34 -0000
There arent many threads in that size range.
7BA is 98 thou x 52.9tpi, and 8BA is 87 thou x 59.2 tpi. (Those all look
more sensible in metric!)
There was a pair of Whitworth instrument threads, of 90 thou and either 50
or 60 TPI, the Thyry upon which BA was based (but they are so close to BA
that they can be ignored), plus a Loewenhertz thread and possibly another,
but both the latter are used solely in watchmaking.
Alan Stepney
http://www.alanstepney.info
Model Engineering & steam engine information pages
----- Original Message -----
From: <bede@xxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, December 19, 2006 1:53 AM
Subject: [modeleng] BA/ME Thread Query
Hi All,
I'm fitting point rodding on my gauge 0 (live steam) layout and have
some old but unused brass "forks" to connect the rodding to the bell
cranks. The forked end connects to the bell crank with a split pin, and
the other end is tapped to thread onto the end of the rodding.
But I need to thread the ends of the rodding and can't figure out what
the threads are on the forks- they seem to be somewhere between 7BA and
8BA. Both threads work after a fashion, the 7BA a tight fit and the 8BA
on the loose side, but neither seems really right. And the smallest ME
thread I know of is 1/8" x 40tpi, which is too big. Am I missing
something here? These forks were mass produced by Bassett-Lowke,
MilBro, etc, so must have been to a standard thread.
Any thoughts?
Thanks as always.
Bede in balmy Brooklyn, NY
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