4 jaw chuck:

☛ Work pieces cannot be set for eccentric turning

☛ Mainly used to hold circular, oval jobs.

☛ Depth of cut given is comparatively less.

☛ Less gripping power

☛ 3 jaws cannot be adjusted individually

☛ Setting up of work is easy

3 jaw chuck:

☛ Work pieces can be set for eccentric turning.

☛ Used to hold circular, oval jobs, rectangle and square jobs

☛ More depth of cut can be given.

☛ More gripping power

☛ 4 jaws can be adjust individually.

☛ Difficult.