Question 1 Consider the preferred hole basis charts. Is the following statement true or false: The lower limit of the hole tolerance is always equal to the nominal size of the joint. True False Question 2 A steel dowel pin of 10 mm nominal diameter has a note indicating, "ISO 2338 (diameter = h7 tolerances)." What is the lower limit of size for the pin diameter? Question 3 A shaft needs to be machined to make multiple diameters possible and the various mating gears are also being machined. Which ANSI B4 tables should be used: Diameters of size Preferred shaft basis Limits of diameters Preferred hole basis Question 4 A door hinge has a nominal .25 inch pin (shaft). The pin is manufactured to have a special head and the same company manufactures the hinge hole. Assume a "Free running fit" is appropriate. What is the range of possible clearance between the pin and mating hole? Identify the lower limit and the upper limit in the list below.
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Step 2: For Question 1: - The statement is: "The lower limit of the hole tolerance is always equal to the nominal size of the joint." - In the preferred hole basis system, the hole's lower limit is typically set to the nominal size, and the shaft is machined to Show more…
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a. If the most conservative fatigue criterion as shown in the figure below were used for infinite life design, the first cycle yield failure check is not needed. True or False b. It is easier to find the asymptotic value of fatigue strength as the endurance limit on the S-N curve for the CZ3000 alloy than that of endurance limit on the S-N curve for the 1045 steel. True or False c. "Through the notch sensitivity approach, you obtain a fatigue stress concentration factor higher than the stress concentration factor under static loading condition." True or False d. Since the contact stress and load relation is not linear in rolling, the Hertzian endurance strength should increase nonlinearly with the hardness of the contact material. True or False e. Refer to the figure below. Even though the cyclic loading accidentally caused the stresses to exceed the levels at point A slightly (as marked by the red arrow), the machine part may not break instantly according to the Modified Goodman fatigue failure criterion. True or False Yield (Langer) line Alternating stress ̃̃a Gerber line Load line, slope r = Sa/Sm Modified Goodman line ASME-elliptic line Soderberg line Sm Sy Sut Midrange stress ̃̃m
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