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AC-25 Air Collet Closer
Haas offers three types of collet closers for use on HA5C indexing heads. Each of the three designs offers unique benefits you should consider before making a selection. AC125 and AC25 use shop air to drive a piston through a mechanical multiplier to close the collet. This provides greater holding force and reduces operator fatigue, compared to standard manual-handle closers. A simple flick of a lever causes the collet to open or close without effort. On multi-spindle heads, one of these air-actuated closers is required if you plan to use collets, because a standard handle will not fit and is not included.
The AC 25 is our smallest and most economical closer. It fits entirely inside the HA5C body, and can be used both vertically and horizontally. Since it utilizes air pressure to close, part claming pressure can be varied easily by regulating the applied air pressure. The AC 25 provides medium holding power of up to 3,000 pounds draw force, with .030'' of travel, and is recommended for drilling and light milling of collet-size parts. The .030'' travel allows for a part diameter variation of .007'' without the need to readjust the collet. The AC 25 should not be used with step collets. The AC 25 does not have a thru-hole, and collets must be tightened using a 9/64'' Allen wrench, tightening through the collet. Collet stops may be used, but must be drilled completely through to accomodate the allen wrench.
