Gary,
Would attempt to use thread gauges and look at the air gap between the
threads and each gauge. Could also try a BSC nut, but with the short
threaded length on the speedo drive and the tolerance of the nut - may
not be conclusive.
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar
On 8/9/21 11:13 AM, warthodson--- via Healeys wrote:
>
> Bob,
> If you had one available, how would you go about checking the thread
> angle?
> Gary Hodson
>
> -----Original Message-----
> From: Bob Haskell via Healeys <healeys@autox.team.net>
> To: Harold Manifold <manifold@telus.net>; john harper
> <ah100tech@gmail.com>; Hank Leach <gradea1@charter.net>
> Cc: healeys@autox.team.net <healeys@autox.team.net>
> Sent: Sun, Aug 8, 2021 7:14 pm
> Subject: Re: [Healeys] Speedo Drive Thread Size?
>
> Harold,
>
> As has been pointed out in separate emails, there are two standards that
> include 3/4" dia with 26 TPI. British Standard Cycle with thread angle
> of 60 degrees and British Standard Brass with a thread angle of 55
> degrees. Since the speedo drive is brass I would suspect the latter,
> but I don't have one handy to check.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
>
>
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