Discussion
Which of the following is used to hold large, heavy and irregular shaped work pieces which cannot be conveniently held between centers:
Answer: C
Large, heavy and irregular work is held on a face plate.
A face plate is a large disc screwed onto the spindle nose, with radial slots through which the work is bolted or clamped directly. Because the work is fixed with bolts, plates and angle plates rather than gripped by jaws, almost any shape can be set up, including castings and odd shapes that will not fit between centres.
A three jaw chuck grips only round or hexagonal work, and a two jaw chuck only work of suitable shape. A driving plate does not hold work at all: it drives a lathe carrier on work mounted between centres, which is exactly the case the question excludes.
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