Patent ID: 6857175

Claim:
A method of operating on a workpiece ( 6 ) carried on a female die ( 5 ) mounted on one end of a C-shaped counterforce structure ( 9 ) and on which is mounted, at the other end thereof, a device ( 8 ) having a pick-up device ( 4 ), and a male die ( 3 ) guided by the pick-up device ( 4 ), the method comprises the steps of: a. measuring relative movement between the counterforce structure ( 9 ) and the pick-up device ( 4 ) with a first sensor ( 1 ); b. measuring relative movement between the pick-up device ( 4 ) and the male die ( 3 ) with a second sensor ( 2 ); and c. setting a uniform depth of operation on the workpiece ( 6 ) responsive to the measurements of the first sensor ( 1 ) and the second sensor ( 2 ).