Quick-Change Workholding Resources

Traditionally, in the metalworking industry, machinists were prized for their ability to achieve precision results through their creative fixture construction and their ability to maximize output. One of the shortcomings of this approach was the very individualized results achieved this way. This methodology had numerous limitations including the need to build the fixturing each time the job was run, resulting in variations in output and quality. Setup time was a serious limitation in overall productivity, as well. 

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In North America the predominant type of Quick-Change system is the Carr Lock Mounting System®. This mechanical system provides high accuracy locating, typically +/-0.0005”, and good retention force. The Carr Lock System consists of three components, the Carr Lock Clamp, Liner Bushing, and Receiver Bushing.  

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Several manufactures sell a Mechanical Quick-Change system that uses an inverted threaded fastener to provide locating and retention.  These systems have excellent retention force but due to the nature of threads the location accuracy of these systems is often +/- 0.01”.

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These systems, like the powered versions of Zero-Point Systems, consist of a receiver that provides retention and a pin that provides location. 

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