Abstract: A workpiece fastening device usable on a machine tool fixture, comprising an elongated tubular body having knurling along the outside of the top end of the body, a taper on the inside thereof, and a plurality of slots extending longitudinally about half the length of the body. A lock washer with a yieldable portion is welded to the bottom end of the body to allow a workpiece to be pulled flush against a fixture. The tubular body is slip-fitted into a through-bore in the workpiece until the lock washer rests upon the fixture, and a bolt having a head taper matching the taper in the tubular body is then inserted through the body and is threadably received in the fixture. Upon tightening of the bolt, the top of the body expands causing the knurling to grippingly engage the bore in the workpiece. After the body is completely wedged in the bore, further tightening of the bolt causes the lock washer to be distorted slightly thereby allowing the workpiece to be pulled flush against the fixture.

Abstract: A method of providing a structural drop-off in a preplied two or more sheet resin impregnated laminate for forming a composite of several laminates having different structural drop-off positions, each of the sheets having unidirectional fibers oriented at a bias relative to the fibers of the other sheet, and the steps of the method including making a plurality of feather cuts along one edge of the sheets in the direction of the fibers of one sheet and across the direction of the fibers of the other sheet resulting in negligible structural effect on one sheet and foreshortening of the fibers in the other sheet thereby providing a structural drop-off internal to the edge of the preplied two sheet laminate.

Abstract: A router is mounted in a resilient support within a housing mounted on the end of a robot arm to permit substantial lateral movement of the router relative to the housing in any radial direction as the router traverses a template; the router being concentrically positioned within the housing in a resilient support positioned midway between the ends of the router.

Abstract: Apparatus for early detection of fatigue cracks in aircraft structure surrounding fasteners and the like.An ultrasonic scanner manipulating apparatus is provided with various types of replaceable tips which are used to establish the center of a given fastener, adjustable support legs which provide stability and maintain a proper distance for an ultrasonic transmitting/receiving head assembly to be rotated 360.degree. about the centerline of the fastener, and a liquid filled boot attached to the transmitting/receiving head assembly to assure a reliable signal path between the head and the structure being evaluated.

Abstract: A Doppler radar signature simulator decoy for protecting a helicopter under attack by hostile weapons which home in on a Doppler radar return signal from the helicopters rotors. The decoy returns a strong radar signal which duplicates a relatively weaker signal emitted from the helicopter rotors, leading hostile weapons to the decoy.