# Attachments:

MEGN 481: Machine Design

1) he rotating 1050 cold rolled steel shaft shown in the figure below is simply

supported at the center of two bearings (denoted by an X) and the only

applied load is the constant 7kN load. All dimensions are in mm and all steps

in the shaft have a 4mm fillet radius at the base of each step. Use the ANSI

recommendations for keyway design. All three locations, A, B and C have a

non-steady torque of Tmax=500N-m and a Tmin=400N-m that follows a sin

wave (magically). Determine the safety factor for infinite life at locations A, B

and C. The shaft is machined, used at room temperature and requires a

material reliability of 99.9%. Assume all other correction factors are equal to

0.499 when multiplied together.

A B C

2) For the shaft shown below, disregard the diameters noted. You must

completely design the section of the shaft enclosed in red. Specifically, you

must determine the three shaft diameters (locations marked “b”, “a”, and the

one between). The diameter of the stepped-up shaft between “b” and “a”

cannot be greater than 1.25 times the larger of the two (“a” or “b”). You must

design to a FoS=2.5. You must determine an appropriate radius for the

transition between the smaller shaft diameters and the larger one (locations

marked as “A” and “B” only). You must also specify the correct keyway for

shaft section “a” (location marked “C”). Inputs to the system and B.C.’s are

identical to those stated above in problem 1.

A B C

b a

3) What are the maximum, minimum and average power values for the shaft

shown below when l = 20, a = 16, b = 18, P = 1000, Tmin = 0 and Tmax = 2000 lbfin

if shaft speed is 750 rpm?

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