Abstract: An applicator for applying a fluid substance to a drilled hole as part of an automatic fastening machine. The fastener machine drills the hole in the workpiece, such as an aircraft wing panel, and then the substance applicator applies the substance to the hole, prior to subsequent installation of the fastener within the hole. The substance applicator, which is connected to a movable pressure foot, is pneumatically operated so that a head portion of the applicator is extended laterally over the hole, and a tip assembly in the head is extended vertically downward toward the hole. This operational sequence is accomplished by means of variable rate springs which bias the tip assembly and base to retracted positions. The substance is delivered to the tip assembly from a storage reservoir by means of a peristaltic pump. Positive shutoff of the substance to the tip assembly is achieved by a pivotally mounted shutoff arm assembly.

Abstract: An automatic countersink depth control tool and a combination of the same with an installer for fasteners having countersink heads. The tool has a nonrotatable stop (76) for limiting the depth of a countersink drilled in a fastener hole. The stop (76) is adjustably movable toward or away from a workpiece in which the countersink is to be drilled, the movement of the stop being relative to the depth of the countersink. There is a rotatable screw gear (50) having an external ring gear (54) for moving the stop in accordance with the depth of the countersink and in accordance with the height of the head of the countersink head of the fastener to be installed in the hole. There is a motor (90) having a spur gear (94) engaged with the ring gear (54) to rotate it a predetermined amount by a threaded engagement of the screw gear (50) and the stop (76). Because the stop is nonrotatable, the rotation of the threads moves the stop the desired amount.