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Unusual Bolt needed
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jp928



Joined: 07 Jun 2016
Posts: 247
Location: Australia

PostPosted: Sat Sep 03, 2016 5:38 am    Post subject: Unusual Bolt needed Reply with quote

The steering wheel retention bolt on my Rover 9 is missing, and I cant find any trace of a bolt with the same thread....27/32-18tpi. No trace of taps or dies either. Dont have an imperial lead screw on my lathe, so I cant cut one.
If any body knows where one might be found I would appreciate it a lot! Looking locally for somebody who might make one also.
Column is tapped for 1.5", needs enough hex head to tighten down on a washer.
thanks
jp
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Kenham



Joined: 12 Mar 2012
Posts: 182
Location: Kent

PostPosted: Sat Sep 03, 2016 1:28 pm    Post subject: Reply with quote

Where abouts are you , my lathe has imperial and metric so should not be a problem. Ken
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jp928



Joined: 07 Jun 2016
Posts: 247
Location: Australia

PostPosted: Sat Sep 03, 2016 2:08 pm    Post subject: Reply with quote

Ken,
I am in Melbourne, Australia.....I have put out a call for help with this locally, so lets see if I have any luck closer to home first. If not I will come back to you.
Thanks for offering so quickly!

john
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Kenham



Joined: 12 Mar 2012
Posts: 182
Location: Kent

PostPosted: Sat Sep 03, 2016 9:46 pm    Post subject: Reply with quote

Hello John, not just down the road then, might be worth trying your local model engineering society, very often some of the older lads like a different challenge for a few shillings. Ken
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Peter_L



Joined: 10 Apr 2008
Posts: 2349
Location: New Brunswick. Canada.

PostPosted: Sat Sep 03, 2016 11:08 pm    Post subject: Reply with quote

Hello John. I am going to ask a really stupid question.

Does this "missing bolt" pass through the steering wheel and into a threaded hole down the centre of the steering column ?. If so, how did you arrive at the diameter and TPI ? Without photos and not being that familiar with steering system of that era, I cannot visualise the technique you used..

Regards

Peter L
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jp928



Joined: 07 Jun 2016
Posts: 247
Location: Australia

PostPosted: Sun Sep 04, 2016 1:54 am    Post subject: Reply with quote

The column tube has a taper on its top end, and a small key to locate the wheel. The wheel centre slips on the taper, with the top of the tube is maybe 1mm low inside the wheel centre. I measured the inside of the female thread in the tube as best I could and got 25/32 . Separately one other person with a 9 has advised me its 27/32 OD on the bolt, and another that a 13/16 spanner WONT go over the bolt thread, but 7/8 is loose, so 27/32 seems to be correct. Everybody agrees its 18 tpi.

jp
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Peter_L



Joined: 10 Apr 2008
Posts: 2349
Location: New Brunswick. Canada.

PostPosted: Sun Sep 04, 2016 2:24 am    Post subject: Reply with quote

Thanks John. I have the vision now.
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V8 Nutter



Joined: 27 Aug 2012
Posts: 528

PostPosted: Sun Sep 04, 2016 7:00 pm    Post subject: Reply with quote

Are you sure you have the T.P.I. right. I've had a look through some old charts and the only standard thread I can find with a 27/32 O.D. is half inch British Standard Pipe but that is 14 T.P.I. Of course the thread might be Rovers own and not a standard one
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V8 Nutter



Joined: 27 Aug 2012
Posts: 528

PostPosted: Sun Sep 04, 2016 7:04 pm    Post subject: Reply with quote

Are you sure you have the T.P.I. right. I have had a look through some old charts and the only thread I can find with a 27/32 O.D. is 1/2 British Standard Pipe, but that is only 14 T.P.I. Could be a old thread from before standardisation or Rovers own
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jp928



Joined: 07 Jun 2016
Posts: 247
Location: Australia

PostPosted: Sun Sep 04, 2016 10:46 pm    Post subject: Reply with quote

Yes, and Yes, we are sure its 18tpi!

jp
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jp928



Joined: 07 Jun 2016
Posts: 247
Location: Australia

PostPosted: Wed Sep 07, 2016 11:22 am    Post subject: Reply with quote

Problem solved. Local gent on ozclubbies turned up a threaded section within 24hrs of my post, and it arrived today - perfect fit! Verifies that it is 27/32x18tpi, so shame on all the sceptics.

jp
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1279
Location: Barnsley S. Yorks

PostPosted: Wed Sep 07, 2016 12:47 pm    Post subject: Reply with quote

Which leaves, I guess, only the opportunity to speculate why such an odd-ball was used in the first place!
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1279
Location: Barnsley S. Yorks

PostPosted: Wed Sep 07, 2016 12:47 pm    Post subject: Reply with quote

Which leaves, I guess, only the opportunity to speculate why such an odd-ball was used in the first place!
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Peter_L



Joined: 10 Apr 2008
Posts: 2349
Location: New Brunswick. Canada.

PostPosted: Wed Sep 07, 2016 12:56 pm    Post subject: Reply with quote

jp928 wrote:
Problem solved. Local gent on ozclubbies turned up a threaded section within 24hrs of my post, and it arrived today - perfect fit! Verifies that it is 27/32x18tpi, so shame on all the sceptics.
jp


Perhaps the other "sceptics" will also be shamed into silence on future posts.
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jp928



Joined: 07 Jun 2016
Posts: 247
Location: Australia

PostPosted: Wed Dec 14, 2016 1:53 am    Post subject: Reply with quote

Peter,

OOPS, that would be a bad result, sorry I got righteous. i did get it wrong on the OD of the thread at first, but TPI was measured with a proper thread gauge, and verified by other owners.

jp
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