Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1990-01-08
1991-02-26
Eley, Timothy V.
Metal working
Method of mechanical manufacture
With testing or indicating
29446, 295251, 73761, 7386223, 7386224, B23Q 1700
Patent
active
049951459
ABSTRACT:
A method of reducing variations in the static torque of threaded fasteners, as measured after a relaxation period, uses an instrumented nutrunner to "break" the joint. Breaking the joint is done by monitoring the torque and angle of the fastener during a torque recovery cycle. The angle of the fastener is advanced until a threshold torque is reached and then the fastener is turned an additional predetermined number of degrees. A static audit may be simultaneously performed by storing torque and angle values. Static torque is distinguished from break away torque by detecting the point of minimum curvature of the subsequently produced torque angle curve.
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Allen-Bradley Company Inc.
Eley Timothy V.
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