For what it's worth, the standard taper is called a "Morris taper." It is
cut at such an angle that it "self-seats." This means that with only
slight axial pressure, the male part (the taper pin) will not turn in the
female seat. This is used in all manner of systems (as noted), including
precision lathes. The reason it is used in ball joint pins is that by
simply pressing with your hand on the top of the ball joint, you can run
the retaining nut onto the thread without the pin turning. Also, it seats
VERY positively, so it does not develop any play. However, some designs,
such as the hubs on TR's, can be a real pain to loosen! When I replaced
the seal on a TR-3 axle, I loaded the axle with 10 tons on a hydraulic
ram, then hit it with a hammer. It let go with such a bang, like a
shotgun going off, it scared half the shop to death! They thought
something had exploded!
On Tue, 11 Apr 2000, Randall wrote:
>
> Malcolm :
>
> Not entirely sure what you mean by 'real world', but how 'bout :
>
> Rear hubs on a TR (why do you think they're such a b*tch to get off
> <g>).
>
> Tie rod ends on every car I've owned (including TRs).
>
> Pitman arms on every car I've owned that had one (including TRs).
>
> Ground glass stoppers on lab flasks.
>
> Taper pins (offhand I can count 6 on my TR, not counting the pin that
> located the dizzy drive gear to the shaft, which I've replaced with a
> roll pin).
>
> And the most interesting (to me <g>) : old fashioned cast iron boilers
> were cast in sections, with the sections connected only by taper
> fittings, no threads (at least in Britain, not sure about US boilers).
> At least some steam radiators (like for home heating) were also made
> that way.
>
> There are of course many sizes of Morse taper, and Jacobs taper, and
> others I don't remember the name of ...
>
> Randall
>
> Malcolm Walker wrote:
> ><snip>
> >
> > Tapered interference fit / threaded fit are used all over the place in
> > metalworking & plumbing applications, but I can't think of a "real world"
> > example, other than yer average #2 Morse Taper tail stock dead center...
> > or 1/2" NPT pipe thread... (hmm)
>
>
James A. Ruffner
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