Answer to Question #336327 in Mechanical Engineering for Leo

Question

In a crane, the chain sprocket is driven by a motor on the spindle of which

is keyed a pinion of 14 teeth. This meshes with a gear of 68 teeth keyed

to the same spindle as a pinion of 12 teeth. The last gear meshes with a

gear of 50 teeth keyed to the same spindle as a gear of 25 teeth, and

the latter gear meshes with a gear of 54 teeth keyed to the chain sprocket

spindle. Chain sprocket is 16 ½ 𝑖𝑛. in diameter. Sketch the arrangement

and find the number of revolutions per minute of the motor when 20 ft of

chain are wound on the drum per minute.