Barney,
I don't think this is a trick. The machine causes a straight back
and forth vibration. It is not orbiting. The machine was not
created by a company to sell something. It has been around as a
"standard" test device for many years. This Bolt Science company
appears to be a consulting firm, selling only training and consulting
services. The valid thing to question is whether or not this
replicates "real world" conditions. I think the answer is no, or
else all vehicles would be reduced to their component parts in the
first hundred miles. But sometimes an extreme test can demonstrate a
process that might otherwise take a long time to happen. Take a look
at the video I posted earlier. It shows how the machine works:
http://www.boltscience.com/pages/junkertestvideo.htm
If you want to see another video, from a company that is selling
something, check out:
http://www.youtube.com/watch?v=LdSZGu41mf0
They seem to have come up with a clever design.
-Steve Trovato
strovato at optonline.net
At 01:40 PM 6/22/2011, 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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