Uuuuusually that's held to be from the wheel trying to wobble on the splines
rather than the fore and aft motion, as per this description on Barney
Gaylord's site:
""As the car moves forward, a different portion of the wheel rim takes the
weight and relative movement occurs between wheel centre, locking cap and
hub. The effect of this is to tighten the locking cap .... The clearances
involved are of course, minute but the locking action is completely positive
and entirely automatic."
"The 'relative movement' he speaks of here is orbital motion like the action
of a Hulla Hoop (Damn! just how old am I anyway?). As a Hulla Hoop orbits
around a person's waist it also rotates, with this rotational motion being
caused by the difference in the diameter of the two 'round' parts."
Or, when you played spin-the-plate as a kid, and the spin changes to a
wobble, the plate starts to rotate as it gets closer to stopping altogether.
It also explains why towing a knockoff wheel car backwards for long enough
will make the wheels fall off when there is no fore and aft movement, and
why both front and rear knockoffs always tighten even though they have
different fore and aft stresses.
But it *is* the fore and aft motion that 'hammers' on the faces of the
splines and causes them to thin and eventually shear.
PaulH.
----- Original Message -----
From: <WSpohn4@aol.com>
To: <mgs@autox.team.net>
Sent: Thursday, March 25, 2004 2:44 PM
Subject: Re: Splines
> - witness that the knock off nuts
> tighten up -
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