Q4-1

Make a sketch of a Whitworth slow-advance and quick-return motion, and calculate the length of the driving crank when the ratio of the time of advance to the time of return is 2. The distance between centers is 3 in. Also calculate the length of motion in the slotted crank.

Q4-2

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 which is 50 in. long. The other rocker is 6 in. long and at an angle of 45 with the line of centers. A force of 100 lb is applied at the end of the 12-in. rocker and directed perpendicular to it. What torque is exerted on the shaft of the 6-in. rocker?

Q4-3

Two cranks, each 6 in. long, are connected by a drag link. Crank centers are 4 in. apart. The drag link connecting the free ends of the cranks is 7 in. long. Determine graphically the angular velocity ratio when one crank assumed as the driver has moved through 90 from the vertical position.

Q4-4

A crank 4 in. long oscillates a rocker 20 in. long through a connecting link 28 in. long. The distance between crank and rocker centers is 22 in. Calculate the angle through which the rocker oscillates.

Q4-5

Name seven mechanisms, giving descriptive information and diagrams of each.

Q4-1

Refer to Fig. 4-1. It is apparent that the sliding block will take twice as...