William K. Wallace - Barneveld NY David L. Rosbrook - Whitesboro NY
Assignee:
Chicago Pneumatic Tool Company - New York NY
International Classification:
B23Q 1906 G06F 1520
US Classification:
81469
Abstract:
A method and apparatus for controlling final tension on a fastener being run up and set. An efficiency factor is developed and utilized for attaining predetermined final tension on a fastener, or a group of similar fasteners, being operated upon. The efficiency factor is a ratio between work on a theoretical fastener, i. e. , one wherein friction load is absent in work calculations, and work on an actual fastener. Having obtained the efficiency factor, the actual torque load on a fastener to attain predetermined tension value, can be established by use of the efficiency factor.