[modeleng] Re: Technical education
- From: "John Pagett" <john_pagett@xxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 1 Aug 2006 21:18:17 +0100
Alan,
Well I'm going to stick my head above the parapet.
This is what I think the guy's going on about. The thin nut is tightened,
stretching the bolt slightly and making the upper flanks of the nut thread
bear against the lower flanks of the bolt.
The other nut is bought down to bear against the lower nut, but not tightly.
Again the upper flanks of the nut thread bear against the lower flanks of
the bolt thread.
By "loosening" the lower nut, the clearance in the thread is taken up in the
opposite direction, so now the lower flanks of the nut thread push against
the upper flanks of the bolt thread. In the meantime the clamping load has
been transferred to the upper nut threads. The tension in the bolt should
remain the same.
As to whether he's right.... I dunno.
As those who remember leisurely Saturday afternoos with Kent Walton's
measured wrestling commentaries might recall
Seconds away, round one
JohnP
----- Original Message -----
From: "alan stepney" <alan@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, August 01, 2006 5:18 PM
Subject: [modeleng] Technical education
We have often discussed and bemoaned the lack of technically competant
engineers and compare the educaton of today to "what it was in my day".
Someone has lent me one of the basic textbooks used by those in the early
stages of a technical education.
(Metalcraft, by F. J. Wynter)
Having read through it and found several errors, the following being an
example:
(Yes, we have also discussed the placing of thin versus thick nuts, but lets
put that to one side for a moment.)
Locknuts.
This (thin) nut is screwed down and tightened up in the normal way. The
thick nut is then screwed down on top of it, to within a few degrees of its
limit. THEN THE THIN NUT IS UNSCREWED BACK UP TO THE TOP NUT.
No prizes for spotting the errors in this method!
Alan Stepney
http://www.alanstepney.info
Model Engineering & steam engine information pages
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