The Three-Jaw Chuck - 2: Advantages of the Three-Jaw Chuck
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.

One may dispute if there really are advantages of using a three jaw chuck over a four jaw chuck. It may be that there are better times to use each type of chuck. As is discussed in other topics, four jaw chucks are used when the work requires it.

The same thought should apply when discussing three jaw chucks. When the work requires that the part be loaded and unloaded with minimal amount of time and effort, then a three jaw chuck is a good choice.

Three jaw chucks are also a good choice if there is a large quantity of parts to machine, and the operations being performed do not require a high degree of precision or concentricity .

Since the jaws on a three-jaw chuck all move in unison, centering a cylindrical part is not a concern. The part will run concentric with the chuck, providing that there are no foreign particles between the jaws and the part, or that the chuck is installed on the spindle properly and the chuck has not worn irregularly.

The jaw faces can also be reversed to accommodate larger diameters. You will notice in the video that the mechanism that moves/guides the jaws is not removed or reversed. The jaw faces are simply reversed and keyed back into place atop the jaw guide.

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label: three jaw chuck advaantages, disadvantages, mounting, replace jaws, soft jaws, mounting styles