design a single-reduction straight spur gear unit to operate from a 5.0-hp electric motor running at 900 rpm to drive a rotating machine operating at 80 rpm.

1. Using the simplified approach (do not refine results by using AGMA equations), design a single-reduction straight spur gear unit to operate from a 5.0-hp electric motor running at 900 rpm to drive a rotating machine operating at 80 rpm. The motor is to operate steadily at full rated power. Near-infinite life is desired. A reliability of 90 percent is acceptable for this application. It is proposed to use ASTM A-48 (class 40) gray castiron material for both gears. Using , properties for this material may be based on Chapter 3 data, except for surface fatigue strength, which may be taken as psi. A safety factor of 1.3 is desired. As part of the design procedure, select or determine the following so as to satisfy design specifications:

a. Tooth system .

b. Quality level.

c. Diametral pitch.

d. Pitch diameters.

e. Center distance .

f. Face width .

g. Number of teeth on each gear. Do not attempt to evaluate heat generation.

Engineering

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design a single-reduction straight spur gear unit to operate from a 5.0-hp electric motor running at 900 rpm to drive a rotating machine operating at 80 rpm.

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Recent research has documented the fact that Coke is something different compared to other soft drinks. In fact related literature states that Coke has already attained the monopoly status. If we assume the research is correct and coke is a monopolist, then

Do you recommend that the four machine operators continue to switch machines every hour? Would you recommend that the operators are permanently assigned to the machines they currently operate during Hour 3?

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