[modeleng] Re: BA/ME Thread Query
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 19 Dec 2006 05:15:04 -0800 (PST)
Perhaps an old Bassett-Lowke catalogue would shed some
light on the thread size?
Al Messer
--- Alan Stepney <alan@xxxxxxxxxxxxxxxx> wrote:
> 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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