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Hardinge FlexC collet systems are flexible, sealed collet heads that interchange in seconds and are available with spindle mounts for all brands of CNC lathes.

Pull-back through-hole, pull-back stationary stop and push-to-close dead-length styles are available for main and sub-spindle CNC lathe applications.

Purchase one spindle mount and interchange collet heads from job to job.

Hardinge FlexC collet heads are fully interchangeable with competitors’ models.

Hardinge guarantees accuracy within 0.0004in (0.010mm) TIR for the collet system models A and D, and 0.0008in (0.020mm) TIR for style DL.

The changeover concept is simple using a manual wrench to compress the collet for quick removal or replacement in seconds.

A typical FlexC collet head has a gripping range of 0.020in (0.5mm) above and below its nominal size to allow variation in bar stock without having to change the collet.

There is no collet shank, therefore the collet segments remain parallel to the stock even when there are variations in the stock size.

Parallel clamping minimises stock ‘push back’ and requires less draw bar force to achieve the same gripping capability as conventional collets.

Hardinge has invested in the latest vulcanising machines made by Desma.

The vulcanisation process joins the collet segments together as a one-piece unit with a permanent bond.

Vulcanised rubber has elasticity for repeated opening and closing over the life of the collet that makes it ideal for a quick-change product.

It will not become brittle and is resistant to coolant.

Because of the sealed design, it prevents chips from entering the collet system.

Hardinge test results, from using repeated cycles of collet actuation, assures long life of the Hardinge vulcanisation process.

The hardened chrome-nickel steel collet head is hard-turned in one setup on a Hardinge RS 65 high-precision turning centre.

Keyways and slots are milled on a Bridgeport XR 1000 high-performance vertical machining centre.

Hardinge guarantees the collet head concentricity of 0.0002in (0.005mm) TIR for round smooth after the segments are joined in the vulcanisation process.

Turning, milling and vulcanisation are all done in a dedicated work cell for optimum efficiency to bring a high level of quality and throughput for shortened delivery time to the customer.

An emergency collet can be used for just-in-time machining when the proper size hardened collet is not to hand.

The taper and collet seat of an emergency collet are hardened while the ID and the face of the collet head are soft.

A face boring ring will hold the collet in nominal position for boring to size.

Emergency collets are reusable.

Standard collets are stocked in round smooth, round serrated and hex shape.

Square sizes are made to order.

Special applications including stepped holes, special shapes, off-centre, and so on, can be custom-made from stock blanks.

FlexC collet systems will be available for multi-spindle lathes in the near future.

Hardinge Machine Tools

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