Modern Machine Shop
The Production Dynamics Full Bore collet chuck from Lexair utilizes a self-contained mechanical-grip and air-release actuation system that allows use of a lathe’s full spindle bore capacity. According to the company, the chuck increases the through-hole capacity of lathe spindles 25 to 30 percent.
Concentricity is adjustable from the front of the chuck. Its mechanical clamping action is said to eliminate drawback on the stock, giving the chuck true fixed-length capability for faster, more accurate setup. The quick-acting air-release chuck, with “open-on-the-fly” capability (under 500 rpm), helps minimize cycle time and machine wear. Available in eight sizes for stock diameters ranging from 0.25" to 5.50", the collet design is compact and offers improved tool clearance.
The Full Bore collet chuck is self-contained and requires no actuator. It opens from the front in less than a second with shop air pressure, and clamps mechanically with internal die-spring pressure. The system can deliver constant grip force at all speeds, unaffected by centrifugal force, to ensure safe operation at high rpm, the company says.
Clamp force is adjustable from the front, with visual force indicators confirming the clamping status of the chuck and facilitating adjustment. Clamping force can be increased or decreased by adjusting the collet from the front with a spanner wrench. For softer stock, clamping force can be reduced further by removing springs inside the chuck.
This chuck uses standard S-style collet pads. The company also offers a range of accessories, including bar stops, parts ejectors, precision-machined standard collets, master collets and pads, emergency collets, serrated collets and custom-designed collets.