I went poking around in the index of Machinery's Handbook #26 to see
if there might be some information bearing on this question of length.
While I did not find anything specific to our MG questions, I did
discover that there are about 200 pages devoted to shafting, full of
illustrations, descriptions, tables, etc.
In the section devoted to universal joints on shafts, which explains
why there must be two universals on shafts rotating at any speed, there
is a brief reference to couplings. It appears that in shafts of about an
inch diameter, the depth the shaft must be inserted into the sliding yoke
is about two to two.five inches for best service.
Since a shaft connecting gearbox to back axle changes in length with
every bump and rebound, one would assume that the MG engineers worked to
keep that insertion as an average working depth. And so it seems: I
just measured the male splines on a shaft recently removed from my '72 GT
with OD. Spline length is two inches. Depth of the hole seems about
three.
For this car the shaft should be the 31.125 inch shaft. Neither he
shaft removed from the car nor the new one supplied by Moss a couple of
weeks ago measured 31.125 when I did it, but there may be a method for
measuring shafts that have sliding joints/couplings. 31.125 may be a
nominal size, not an actual size.
One suspects that size does matter. Any of the shafts may work under
some conditions for a while, but probably best to use the size fitted by
the engineers who designed the cars.
Bob
On Tue, 25 Sep 2007 10:19:44 -0400 Paul Osborne <paul@ece.rochester.edu>
writes:
> Hi Paul,, your second line is interesting, that would lead you to say
> that then the dimensions given for sizes don't mean anything since
> we can not figure out which one goes where.??
>
> paul
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