HW1_Sol - MAE 4500 Manufacturing Methods Assignment #1...

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MAE 4500 Manufacturing Methods Assignment #1 Solutions Review Questions: a. Define allowance, tolerance, and fit. b. Give examples where the following fits are used: RC5, LC3, LN2, FN3. c. Make a sketch to show a typical surface roughness one would obtain from a stylus instrument traversing perpendicular to the lay of a turned surface. (i) Indicate relative magnifications; (ii) Show the centerline; (iii) Show the roughness width; (iv) Show the waviness width and height; (v) Define R a , R q , and R t (in words or equations). Solution: a. Allowance is the difference in dimensions required for proper functioning (interference, clearance). Tolerance is the permissible difference between maximum and minimum limits of size [or : difference between the maximum and minimum allowable dimension] [or: the inaccuracy permitted in the dimension of a part]. Fit is the functional difference in the dimension of mating parts [or: the position of the tolerance zone relative to the basic dimensions of mating parts]. b. RC5: class 5 running and sliding fit can be used in Piston and Cylinders LC3: class 3 location clearance fit can be used in shaft and bushing LN2: class 2 location interference fit can be used in key and slot fixture FN3: class 3 force and shrinkage fit can be used in shaft and bearing to transmit motion.
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c. v. R a = arithmetic average height of aperities [Eq. (3-4)] R q = root-mean-square average height of asperities [Eq. (3-5)] R t = maximum peak-to-valley height.
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1. A guide shaft and a bushing assembly (Figure 1) are to be used as a part of a device. Positioning accuracy is important for this application, but ease of
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HW1_Sol - MAE 4500 Manufacturing Methods Assignment #1...

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