Below are drawings of two parts that are intended to fit together: a plate with two holes, and a plate with two pegs. For the plate: a) Which, if any, rotational degrees of freedom does the datum plane leave unconstrained? Explain your answer in words. [2 points] b) Which, if any, translational degrees of freedom does the datum frame leave unconstrained? Explain your answer in words. [2 points] (Note: a datum frame includes all datum planes and axes that have been defined.) c) What is the MMC diameter of the larger hole? [2 points] d) When the larger hole is at LMC, what is the diameter of the tolerance zone for its location? [2 points] e) Determine the minimum distance for dimension X, showing your working. [5 points] f) Will the parts always fit together with a clearance fit? Show working, and explain why or why not. If not, suggest dimension changes to the hole diameters on the plate such that the two parts always have a clearance fit. Explain your approach and do not change the tolerances. [6 points]
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- The datum plane typically constrains rotation about the axis perpendicular to the plane. However, it does not constrain rotation around axes that lie in the plane itself. Therefore, the plate can rotate around any axis that lies in the datum plane. Show moreā¦
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Adi S.
A polyethylene cylinder is attached to perfectly rigid end plates on its top and bottom ends, both of which are free to move. A solid steel rod is attached to the bottom end plate but extends through a hole in the top plate and is securely fastened to a rigid nut. At the initial conditions depicted in the sketch below, there is a 0.25 mm gap between the underside of the nut and the top of the top end plate. If the temperature of the assembly is increased by 80Ā°C, determine the following (assume that the dimensions of the end plates do not change with temperature): a) The resulting axial force in the steel rod; and b) The final length of the polyethylene cylinder.
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