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From: (no name) (no email)
Date: Sun Nov 20 2005 - 01:31:43 EST
Quoting :
> What kind of idiot designs a coupling that is SO
> CRITICAL to safety in such a way that FRICTION is
> the only thing keeping the two parts together?
> Eric Thompson
REPLY
The same idiot who designs a deliberate weak (safety) link to protect a much
more expensive part or piece of equipment.
The friction fit of coupling to shaft is calculated to slip only when the safe
working load of the drive line is exceeded.
Which would you rather do? Refasten the coupling or replace the whole
transmission?
Same thing with a shear pin. I know certain peopel who deplored the idiocy of
the "stupid" designes who put in a soft brass shear pin in the propeller hub.
When they hit a rock and sheared the pin they cursed and then replaced the pin
with a nice strong steel pin.
Guess what, next time they hit a rock it was the gearbox that broke, not the
shear pin.
Mind you, the designer of the deliberate weak link is also assuming that
proper maintenance and operating proceduer is followed.
But you're not one of those guys are you?
Cheers
Arild
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