Question

In a shaper machine, the mechanism for tool feed is

(a) Geneva mechanism

(b) Whitworth mechanism

(c) Ratchet and Pawl mechanism

(d) Ward Leonard system

I had been asked this question in quiz.

This key question is from Acceleration of a Point on a Link topic in division Acceleration in Mechanisms of Machine Kinematics

Answer 1

Right answer is (c) Ratchet and Pawl mechanism

To explain I would say: The crank shaper, in which the tool carrier is driven forward and backward by an oscillating arm operated by a crankpin in the main driving gear, or “bull wheel,” and in which the feed is transmitted to the worktable by ratchet-and-pawl mechanism, is so commonly used as to be termed standard.