velocity ratio N3 N4 5 22 22 222211 2424 11 7 32 32 323211 2424 11 9 40 40

# Velocity ratio n3 n4 5 22 22 222211 2424 11 7 32 32

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velocity ratio N3 N4 5 22 22 22/22=1:1 24/24= 1:1 7 32 32 32/32=1:1 24/24= 1:1 9 40 40 40/40=1:1 24/24=1:1 Speed Gear pair 1 Actual velocity ratio Theoretical velocity ratio N5 N6 5 24 12 24/12=2:1 32/16=2:1 7 44 34 34/16= 17/8 32/16=2:1 9 60 42 42/22= 21/11 32/16=2:1 Overall speed ratio: ¿ N 1 N 6 = 42.22 B. Use the Morse PT-93 Catalog to select a Speed Reducer Select a worm gear speed reducer for a bark conveyor at a paper mill. The speed reducer will be driven by a 1750-RPM electric motor directly connected by a coupling. The conveyor will operate six hours per day and the head shaft speed will be 47 RPM. Calculations indicate that 2000-inch pounds of torque are needed at the conveyor head shaft.1.What is the service factor for the given application? 2.What is the overall drive ratio? 3.If a belt drive is used for the secondary reduction, what should be the ratio of the worm gear reducer? Belt drive ratio is 1.24.  • • • 