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The UBL (Universal Ball Lok) is “The Original” ball style, pull down chuck. Developed by Newton Woodworth, it has since been copied worldwide. Where concerns about flatness, parallelism, and perpendicularity exist, a pull down chuck is typically preferred. In order to meet these requirements, a pulldown chuck is utilized, to secure the part against a work stop. The UBL can provide both standard pulldown as well as extended or “active” pulldown, which allows for extended part range. Where roundness is a concern, the UBL utilizes internal jaw homing. This allows the jaws to “compensate” for irregularities associated with unfinished parts such as castings, forgings, etc. This feature is similar to pendulum (or swivel) jaws used on sliding jaw chucks. The advantage the UBL has, is the homing is internal to the chuck. This keeps contaminants associated with the machining process, from affecting the homing mechanism.
The UBL comes in both centralizing and compensating designs, as well as the on/off style, which allows the user to switch between centralizing or compensating. The standard design incorporates either 2 or 3 jaws. However, Forkardt Hardinge has designed, 1, 4 and 6 jaw designs. The UBL is typically used in first operation turning, but has been incorporated in operations where it is chucking a machined diameter.
