Discussion
The preferred option for holding an odd-shaped workpiece in a centre lathe is
Answer: D
The preferred option is a four jaw chuck.
Each jaw of a four jaw chuck is moved independently by its own screw, so the jaws can be set to grip irregular or odd-shaped work and to position it off-centre, for example to turn an eccentric diameter.
A three jaw chuck is self-centring: all jaws move together, which suits round and hexagonal stock but cannot grip irregular shapes securely. Live and dead centres with a lathe dog hold work between centres, which needs centre holes on the axis of a reasonably regular part.
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