Basically, according to Smith, the split washer, once it is torqued down
becomes a flat washer. The clamping force is the result of the nut
stretching the bolt to a pre-determined load.
Mike
Michael Singleton
Sportscars Ltd
10170 Croydon Way
Suite M
Sacramento, CA 95826
(916)366-0330
mike@sportscarslimited.net
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Bill Saidel
Sent: Wednesday, June 22, 2011 11:51 AM
To: Barney Gaylord
Cc: mgb-v8@autox.team.net; mgs@autox.team.net
Subject: Re: [Mgs] Spring washers don't work !
Does that mean split washers were designed for static forces, not dynamic
ones? If there is no vibration in the plane of the torque vector, does a
split washer add any resistance in the perpendicular direction?
Bill Saidel
BMCSNJ
'76B'
'74.5 CBB for sale'
On 6/22/2011 1:40 PM, Barney Gaylord wrote:
> That would be funny, if it wasn't so blatently stupid. The "test"
> fixture and the way it is set up and operates is designed to produce
> special conditions that do not ever exist in your car. In short, the
> machine is designed and built specifically to unscrew the nut.
>
> Just as one example for consideration, would you expect the cylinder
> head on your engine to orbit around on the head gasket when the engine
> is running? That is exactly what this machine does. The plate
> immediately below the nut has a large clearnce hole. I don't see the
> rest of the machine, other than to know it is fibrating with a lot of
> input energy. I don't know if the loose plate is being physically
> driven in vibration and orbital motion, or if it does that by virtue
> of the mass of the plate. The method of motivation of the plate is
> irrellevent. The point is, the plate is orbiting in the direction
> required to unscrew the nut. This is similar to putting wire wheel
> hubs on the wrong side of the car so the knock off nut will unscrew
> itself as you drive rather than being self-tightening.
>
> A lockwasher on the cylinder head bolt may or may not prevent the nut
> from unscrewing, but it certainly does not cause the nut to unscrew.
> In the case of this special machine, the moving plate will generate
> more unscrewing torque that the lockwasher can resist, same as being
> able to unscrew the nut with a big enough wrench. All you need to
> defeat this machine is a left handed thread on the screw and nut to
> make the nut self-tightening, just like wire wheel knock-off nuts.
>
> The demonstation in the video is a party trick designed to enable you
> to suspend your common sense long enough to be fooled.
>
> Barney Gaylord
> 1958 MGA with an attitude
> http://MGAguru.com
>
>
> At 10:51 AM 6/22/2011 -0400, Barrie Robinson wrote:
>> ....
>> This is rather dynamite stuff especially to those who are hard into
>> restoration. Can we have some expert opinions?
>> ....
>>> http://www.boltscience.com/pages/helicalspringwashers.htm
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