The Full Bore, a mechanical grip, air-release front mounted collet chuck, is designed to make the full spindle bore able to accommodate large barstock.
Its design virtually eliminates the need for a conventional draw tube and external actuator because air is only used to open the chuck. Spring force holds the workpiece while it is machined, so, the part remains clamped if air pressure is lost. Since the clamping force is constant regardless of spindle speed, the machining speeds can be increased during operation. Using spanner holes, the clamping force is adjustable by tightening or loosening the collet.
Other features include adjustable concentricity and dead-length positioning that allows hex-, round- and square- bar feeding, with collet or pad changes. Pads are available in 1/16" increments for round stock and various sizes for round serrated, hex and square stock. Nine models, with diameters ranging from 6.75" to 14", are available.