[modeleng] Re: BA/ME Thread Query

  • From: "TEL" <tel@xxxxxxxxxxx>
  • To: <modeleng@xxxxxxxxxxxxx>
  • Date: Tue, 19 Dec 2006 20:45:45 +1100

3/32W is also a standard thread and could well be wot it is

> 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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