Barrie,
Thanks for the note. Please let me be clear, I do believe in the mysterious
locking action of the stock setup. Sufficient examples have been presented,
with but one counterexample (perhaps) under investigation. I don't yet
understand why it works, but the number of theories I have seen leads me to
conclude that I'm not alone in this. Your theory is one I have heard, but I
don't think it stands to reason. I will attempt to explain my thinking on
this.
Looking at the left rear wheel, (it has a RH thread) imagine the car doing a
fast accelleration. During the accelleration, your theory would be working,
the shaft would be trying to screw itself into the spinner. However, during
braking (which is a sharper accelleration curve by far) the reverse would be
enacted. Just like your drill example. Imagine the wheel, spinning rapidly
(counterclockwise). Suddenly the shaft/wheel stops. The nut/hub will at that
point try to keep spinning counterclockwise, which with a RH thread of course
unscrews it. Since this twisting force force during braking is much greater
than during accelleration, the net effect would be the reverse of the desired
effect, so this theory cannot be what is causing the spinner to tighten. We
have to look elsewhere for the mysterious locking force.
that's my 2 cents anyway
- Dave
----- Original Message -----
From: Barrie Robinson
To: David Pennington ; mgs@autox.team.net
Sent: Friday, December 29, 2000 1:29 PM
Subject: Re: wheel hubs on the "wrong" side
David,
We all know that we are talking splined wheels not bolt on wheels. yes?
It is all very simple if you have engineering training.....Image the wire
wheel and its wing nut.. The wing nut is reluctant to rotate (Newtons's
first law of motion). As the half/stub axle rotates it screws itself into
the wing nut because the nut is resisting movement This screwing-into or
tightning continues as the nut always resists being moved. Conversely when
the car drives backwards there is a tendancy for the winged nut to unscrew.
The force applies is not large as one can imagine - but given time it will
get loose and then will unscrew rapidly. If you want to see this work just
put a bolt in your electric drill, put a nut on the end and see what
happens when you turn the drill on - in both directions.
At 01:17 PM 12/28/00 -0500, David Pennington wrote:
>I am not trying to be obstinate, but why would a spinner get tighter from
>driving the car forward as opposed to backward? Stopping and starting
torques
>have been discussed. My experience has been that stock spinners tend to
>gradually loosen with use. I also know from experience the stock setup can
and
>will unscrew if the splines fail, and I have proposed a theory as to why
they
>do so. But what possible force could be twisting the spinner if the
splines
>are not spun? Am I missing something here?
>
>I can imagine a tiny amount of play may exist between the splines which
could
>allow the wheel to twist the spinner, and this could/would/will eventually
>loosen the spinner. But this play would be exceedingly small with good
>splines, if it exists at all. And if it does exist, it will tend to undo
ANY
>spinner, regardless of its LH-RH thread type. This is why ALL spinners
need to
>be checked periodically. BTW, a fine thread spinner is less subject to
>loosening than the coarse, due to the increased force the fine thread
spinner
>applies to the wheel if both are equally torqued. This explains the switch
>from 8 TPI spinners to 12 TPI spinners found on later models.
>
>I don't follow your reasoning here, and would very much like to understand
if
>there is a mechanical principle I am overlooking.
>
>thanks again,
>
>Dave P
>70B
>
>----- Original Message -----
> From: Dave Quirt
>
> David:
>
> Don't do it. To do so is a definite death-wish. The main draw-back is
> that extended reversing WILL eventually unscrew the hub-nuts when they
> are on their proper side - they tighten (or keep tight) during forward
> motion. If put on the wrong side, they will be reversing whenever you
> are moving forward. Get the picture now??
>
> Dave Q.
> As and Bs
>
>
Regards
Barrie Robinson
barrier@bconnex.net
|