Abstract: A machine for corrugating a metal foil strip includes a form gear having identical cavities along its perimeter that is driven intermittently by an electronically controlled rotary servomotor to index successive cavities to a forming station. During each dwell of the form gear, a form tooth of a punch unit at the forming station is driven by an electronically-controlled linear servomotor into the cavity to at least partly form a corrugation in the strip. During each operating stroke of the punch unit, a hold finger clamps the immediately outgoing node of the corrugation that just left the forming station against the immediately outgoing tooth of the form gear, thus preventing any part of the outgoing corrugation from being pulled back into the cavity and ensuring that the next corrugation is formed solely from a segment drawn in from the incoming foil.

Abstract: An electronic indicator comprising a first portion attached at one end to an object to be controllably stretched or elongated and a second portion slideably connected to the first portion for relative movement therewith and connected at one end remote from the object attachment of the first portion. Electrical connections donating relative movement between the two indicator portions are attached to monitoring equipment to indicate stretch length.

Abstract: A metal working machine for moving a cutting tool through a metal workpiece which includes a spindle carrying a cutting tool therein, a feed drive motor for advancing the spindle, and a rotation drive motor for rotating the spindle. The workpiece is firmly held by a variable force clamp in an operative position to permit the cutting tool to move therethrough. The thrust of the cutting tool is sensed as well as the rotational velocity of the spindle. A data memory contains the optimum thrust load against a predetermined workpiece material for a cutting tool having a predetermined diameter dimension.