5C Collet Block Improves Safety

Parts remain clamped if loss of air occurs when using the Hardinge failsafe collet block (closer). Air is required during setup to receive the part, whether using a single collet block or a sub-plate of multiple blocks.

Parts remain clamped if loss of air occurs when using the Hardinge failsafe collet block (closer). Air is required during setup to receive the part, whether using a single collet block or a sub-plate of multiple blocks. After setup, a unique spring design holds the workpiece with 1,760 lbs of optimum 5C drawbar force. The spring-to-close design provides the opportunity to use pallet shuttles without the need for air or hydraulic lines. If loss of air should occur during the machining process, parts will remain clamped and concentricity will be maintained without downtime, waste or injury.
 
Modular units can be used vertically, horizontally or in any position for machining or assembly operations. These units will line up on a trunnion plate for fourth-axis, multiple-part machining with a rotary table. Each unit has a 5” square footprint with four mounting holes 4” on-center. A 1/8-27 NPT port is located on the back of the unit for connection to shop air. Maximum operating pressure is 75 psi. Multiple units will connect to a single pneumatic connection, but can have separate valves for controlled workpiece placement during setup. Custom sub-plates, modular setups, valve assemblies and special collets can be provided by Hardinge to meet individual requirements.
 
The company’s through-hole base design allows coolant and chips to be flushed through. This eliminates the time-consuming process of tearing down and cleaning out the unit, as would be the case with other closed-base designs.
 
The 5C collet block offers peace of mind because of the fail-safe design that is built in, the company says. This design eliminates the risk of scrapping parts, the danger of parts flying off if loss of air should occur, and eliminates downtime associated with chip buildup. Over a century of workholding experience provides the reliability and matched precision from collet to collet block, along with flexible gripping options. The company offers a large selection of pneumatic and hydraulic collet blocks for operating pressures up to 5,000 psi.