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Correction...
*Cycle engineers Institute (CEI)* - Older cycle thread superseded by BSC.
The angle of the threads is 60=C2=B0. Not used on Austin Healeys.
On Mon, Aug 9, 2021 at 9:35 AM Curtis Arndt <cnaarndt@gmail.com> wrote:
> Listers,
>
> The most common BSC tread used on AHs was the steering wheel shaft thread
> and nut.
>
> Also BSC is the early version of, and was superseded by CEI - Cycle
> Engineers Institute.
>
> Both BSC and CEI are NOT Whitworth thread forms since they have a 60
> degree thread pitch versus the 55 degree pitch of a Whitworth thread form=
.
> The confusion arises in that fact that the hex heads on either BSC or CEI=
(
> I can't recall off the top of my head) can be BS/W requiring the
> appropriate spanner.
>
> See the attached pdf draft of my article on the subject. Any suggestions
> for this article would be greatly appreciated.
>
> Cheers,
>
> Curt Arndt
>
> On Sun, Aug 8, 2021 at 9:27 AM Harold Manifold via Healeys <
> healeys@autox.team.net> wrote:
>
>> Just when I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, etc.
>> along comes BSC (British Standard Cycle). The threads on the transmissio=
n
>> speedo drive and the angle drive are not the best and could use a
>> refreshed. The pitch is 26 TPI and the diameter is =C2=BE=E2=80=9D as be=
st I can
>> measure. After searching Google the closest match I could find is 3/4" X=
26
>> TPI BSC.
>>
>>
>>
>> I have never heard of British Standard Cycle before. Can anyone confirm
>> if this is the tread size?
>>
>>
>>
>> Harold
>>
>
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<div dir=3D"ltr">Correction...<div><br></div><div><b><span style=3D"font-si=
ze:11pt;font-family:"Liberation Serif",serif">Cycle engineers
Institute (CEI)</span></b><span style=3D"font-size:11pt;font-family:"L=
iberation Serif",serif"> - Older cycle thread
superseded by BSC.=C2=A0 The angle of the threads is 60=C2=B0</span><span s=
tyle=3D"font-size:11pt;font-family:Verdana,sans-serif">.=C2=A0</span><span =
style=3D"font-size:11pt;font-family:"Liberation Serif",serif">Not=
used on Austin Healeys.</span><br></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 9, 2021 at 9:35 AM Cur=
tis Arndt <<a href=3D"mailto:cnaarndt@gmail.com";>cnaarndt@gmail.com</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div =
dir=3D"ltr"><div dir=3D"ltr">Listers,</div><div dir=3D"ltr"><br></div><div =
dir=3D"ltr">The most common BSC tread used on AHs was the steering wheel sh=
aft thread and nut.=C2=A0<div><br></div><div>Also BSC is the early=C2=A0ver=
sion of, and was superseded by CEI - Cycle Engineers Institute.=C2=A0</div>=
<div><br></div><div>Both BSC and CEI are NOT Whitworth thread forms since t=
hey have a 60 degree thread pitch versus the 55 degree pitch of a Whitworth=
thread form. The confusion arises in that fact that the hex heads on eithe=
r BSC or CEI ( I can't recall off the top of my head) can be BS/W requi=
ring the appropriate spanner.</div><div><br></div><div>See the attached pdf=
draft of my article on the subject. Any suggestions for this article would=
be greatly appreciated.</div><div><br></div><div>Cheers,</div><div><br></d=
iv><div>Curt Arndt</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Sun, Aug 8, 2021 at 9:27 AM Harold Manifold via =
Healeys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">hea=
leys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><div lang=3D"EN-US"><div><p class=3D"MsoNormal">Just whe=
n I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, etc. along come=
s BSC (British Standard Cycle). The threads on the transmission speedo driv=
e and the angle drive are not the best and could use a refreshed. The pitch=
is 26 TPI and the diameter is =C2=BE=E2=80=9D as best I can measure. After=
searching Google the closest match I could find is 3/4" X 26 TPI BSC.=
</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">I=
have never heard of British Standard Cycle before. Can anyone confirm if t=
his is the tread size?</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p=
class=3D"MsoNormal">Harold</p></div></div>
</blockquote></div></div>
</blockquote></div>
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