8/19/2019 Elmes I - EAS Take Home

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“Whoever is careless with the truth in small matters cannot be trusted with important matters”

― Albert Einstein

ELMES 1, Take Home Exam

Due date: 4 June 2013

Instructor: Alief Wikarta, PhD

Power is delivered to the pulley and taken out at the gear. The forces acting on each of the elements

are shown on the figure. The pulley weighs 350 lb and the gear weighs 150 lb. The transmitted

torque produces intermittent minor shocks. Both the gear and pulley are fixed to the shaft by a

standard square key. The shaft material is AISI 1030 normalized steel and the key is to be cut from

AISI 1020 cold drawn square stock.

(a) Determine the required shaft diameter by the MSST and DET of failure.

(b) Estimate the slope of the shaft at bearings A and D

(c) Estimate the maximum shaft deflection

(d) Determine the torsional stiffness of the shaft.

(e) Determine the length of the key on both the gear and pulley, by check the shear stress,

bearing stress, and keyway effect.

(f) Sketch your shaft design with proportional dimensions, including the keyway.

If the power is delivered by another shaft which is connected by rigid flange coupling with material

AISI C1117. Determine the dimension of flange coupling, including:

(g) The number of bolt at flange coupling, by check the shear and bearing stress.

(h) The thickness of hub at flange coupling, by check the shear stress.

(i) Sketch your flange coupling, including the bolts and keyseat.

*Other parameters may be determined based on your assumption.