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A5803 Pages: 2

i) Principal dimensions of the cam. ii)The acceleration of the follower at the beginning of the

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lift, where straight flank merges into the circular nose and at the apex of the circular
nose. Assume that, there is no dwell between ascent and descent.

Two 20° gears have a module pitch of 5mm. The number of teeth on the pinion is (10) 20
and the gear ratio is 2. If the pitch line speed is 1.2 m/s, assuming addendum as standard
and equal to one module. Find:

i) The angle turned through by pinion when one pair of teeth is in mesh and ii)

The maximum velocity of sliding

What is meant by interference and undercutting in involute gears? What are the (10)
methods to avoid interference of gears?

PART ^
Answer any four full questions, each carries 10 marks
a) What is a gear train? Explain the different types of gear trains. (8) b) Find the angular

velocity of gear 8 if the angular velocity of gear 2 is 800 rpm in (2) the direction shown
below:

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In an epicyclic gear train, an arm carries two gears A and B having 36 and 45 teeth (10)
respectively. If the arm rotates at 150 rpm in the anticlockwise direction about the centre
of the gear A which is fixed, determine the speed of gear B. If the gear A instead of being
fixed, makes 300 rpm in the clockwise direction, what will be the speed of gear B?
a) Explain the different tasks in kinematic synthesis problems. (4) b) Explain the
different types of synthesis. (6)
a) Explain what do you mean by structural error? (4) 0) Explain the two-position
synthesis of a slider crank mechanism. (6) 13 Derive Freudenstein’s equation for
kinematic synthesis (10)

14 Synthesize a function generator to solve the equation y=1/x over the range 1
three precision positions. Assume 30° starting and 120° for the finishing position for the
input link and 240° starting and 330° finishing for the output link. ****

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