D-1

Describe and illustrate by sketches three different mechanisms that could be used to provide a rotational velocity ratio of 12,500 between driving and driven shafts. Each must be a compact, practical mechanism, suitable for transmitting small amounts of power. Determine the proportions affecting the velocity ratio in each case.

D-2

An eccentric is to be placed on a shaft 3 in. in diameter and to impart a 2-in. stroke to a pump. If the minimum thickness of the eccentric from the shaft to its outer periphery is 1 in., calculate the outside diameter of the eccentric.

Figure D-4

D-3

Show how to construct a cam driving a follower in a line of motion which is offset 1 in. from the cam center. The lowest position of the follower is 1 in. to the right and 1 in. above the cam center. The rise of the follower is 2 in. The follower ascends during the first half-turn with harmonic motion and descends during the remaining half-turn with uniformly accelerated and retarded motion.

D-4

A rocker 10 in. long is actuated by a crank and connecting link, the crank and rocker shaft centers being 20 in. apart. The rocker moves 30 both sides of a line perpendicular to the line of shaft centers. Calculate the lengths of the crank and connecting link.

D-5

Two rockers are connected at their free ends by a link. One rocker is 12 in. long and is perpendicular to the line of centers...