I think Rainier hit the nail on the head. The torque for removing screws is time dependent. On my 45 year old Sunbeam I managed to twist off a couple of bolts that I know didn't take that much torque to put them in in the first place :-)

KennyB

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Blomberg, Rainer
(FL51)
Sent: Friday, May 06, 2005 7:59 AM
To: [log in to unmask]
Subject: Re: [TN] Torque


Ramon,
You must be working with old rusty bolts to get more torque to remove.  This
does not happen with clean, freshly torqued hardware.  Think of the
screw/thread as two ramps sliding together and you can visualize the physics
involved.  Loosening involves overcoming friction under the head and against
the threads.  When loosening, you are unloading the forces holding the
threads together...this is less friction, less torque than driving the
threads together.  I will try your experiment, but my experience is less
torque to loosen.

----Rainer

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