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Weekly Assessment 1 (15%)
Introduction to Mechanical Engineering Design, Innovation & Entrepreneurship
ME 263
Semester: Summer 2020
2019-2020
Page 2 of 2
1. Select any 5 design considerations and explain them with examples. (20 points)
2. Three blocks A, B and a grooved block C have dimensions:
A = 72.5 ± 0.5 mm B = 30 ± 0.3 mm C = 38 ± 0.4 mm
a) Determine the mean clearance (𝑤 ) and its tolerance (tw). (20 points)
b) Determine the mean (nominal) size of (𝐵 ) that will assure that clearance W will not
exceed 5 mm. (20 points)
3. A solid circular rod of diameter d and 500 mm length undergoes a bending moment under the
F = 400 N force inducting a stress 𝜎 = 16 𝑀
𝜋𝑑3 .
a) Using a material strength of 170 MPa and a
design factor of 2.5, determine the minimum
diameter of the rod. (20 points)
b) Using the table below, select a preferred
fractional diameter (5 points) and determine the
resulting rod’s factor of safety. (15 points)
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