Collet Closers Use Collet Heads

The low-profile stationary collet closer uses quick-change vulcanized collet heads.

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The low-profile stationary collet closer uses quick-change vulcanized collet heads. These collet closers were designed around the Hardinge Flex-C collet heads and will also accept other brands of vulcanized collets on the market currently being used in lathe applications. The flex-grip collet closers can be used horizontally or vertically on mill tables, tombstones or rotary trunnions. 
 
These collet closers have a through-hole, double-action, fixed-length design allowing long parts to be accommodated through the body. They are hydraulically actuated with pressure-to-open, pressure-to-close (no springs) while holding the collet and part in a fixed position. Maximum input pressure is 2,000 psi.
 
The collet closers are available in 42-mm and 65-mm sizes and have a low profile of 2.75" and 3.17" respectively. The short height permits more Z-axis clearance to accommodate a range of part sizes. The collet closers can be used individually or ganged together on a fixture plate for multiple part machining. Fourth-axis machining can be achieved when installed on a rotary plate trunnion.
 

Vulcanized collet heads have a much wider compression range than conventional spring collets, allowing for variation in stock, according to the company. A total of ± .020" diameter range is possible while still maintaining parallel grip on the part. Parallel grip helps to minimize stock push back, at the same time requiring less drawbar force to equal the same clamping force of conventional spring collets. Collet change-over is a matter of seconds using the collet compression tool. Additional benefits include automatic centering of the part and quick setup, the company says.