ENME 414 Computer Aided Design, Fall 1998

1. Part A and Part B are assembled together. The dimensions and tolerances of Part A and Part B are given. Determine the dimension and tolerance of the assembly.

2. A company sells its products by producing Part A and Part C. Part B of the product is available to the company through purchase. The requirement of the assembly is to maintain a minimum clearance of 0.05 mm and a maximum clearance of 0.70 mm after inserting Part A and Part B to Part C. What are the dimension and tolerance of Part B that meet the assembly specification?

3. Tolerances can be specified in three formats depending on their nature. They are unilateral format, bilateral format, and limit format. For each of the tolerances listed below, write the other two formats if these formats exist.
   

4. Use the tables provided in Appendixes to identify:
   1. The maximum and minimum dimensions of the hole and/or shaft;
   2. The tolerances for the hole and the shaft, respectively; and
   3. The maximum clearance and the minimum clearance.
      • basic diameter: 5 inches, Basic-Hole System, Clearance Fit = LC2.
      • basic diameter: 5 inches, Basic-Hole System, Interference Fit = LN3.
      • basic diameter: 5 inches, Basic-Hole System, Transition Fit = LT3.
      • Draw a comparison diagram which illustrates these three fits.

5. Use the tables provided in Appendix to identify:
   1. The maximum and minimum dimensions of the hole and/or shaft;
   2. The tolerances for the hole and the shaft, respectively; and
   3. The maximum clearance and the minimum clearance.

      (a) basic diameter: 5 inches, Basic-Shaft System, Clearance Fit = SLIDING.
      (b) basic diameter: 5 inches, Basic-Shaft System, Interference Fit = FORCE.
      (c) basic diameter: 5 inches, Basic-Shaft System, Transition Fit = LOCAT. TRANS.
      (d) Draw a comparison diagram which includes the above three cases.
      

6. The maximum and minimum dimensions of a shaft are 20.18mm and 19.82mm, respectively. The maximum and minimum dimensions of a hole are 20.24mm and 20.00mm, respectively. Use the statistical method to construct a normal distribution figure characterizing the variation of the clearance after the assembly.

7. A senior engineering is reviewing the tolerance information specified by a young engineer who just graduated from college. The tolerance value is 0.24 mm for the diameter of a hole on a component. The senior engineer knows that the smallest standard deviation among the drills available in the company is 0.06 mm. There are 10,000 pieces of the component with the hole to be manufactured. He is trying to tell the young engineer how many of these components will be defective if the tolerance is kept at 0.24 mm. You are asked to make the determination. How accurate is your calculation?