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quiz2_spring2010_solution

quiz2_spring2010_solution - Name SOLUTION EML 2023...

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Unformatted text preview: Name: SOLUTION EML 2023 –Computer Aided Design open book and notes; 50 min. Quiz 2 29 March 2010 1. You are specifying the tolerance limits for a cylindrical fit whose nominal size is 1.35 inches. You wish to have a LC2 hole basis fit. Specify the size limits for the hole and the shaft. hole tolerance: 1.35.001 inches 0 shaft tolerance: 1.350 inches .0006 2. You are specifying the tolerance limits for a cylindrical fit whose nominal size is 33 mm. You wish to have a close running hole‐basis fit. Specify the size limits for the hole and the shaft. Do not change to a preferred size. The fit is classified as H8/f7. hole tolerance: 330.039 mm 0 shaft tolerance: 330.025 mm 0.050 Questions 3 through 10 refer to the drawing of the base plate. Units are in inches. 3. Sketch and label the datums on Figure 1. B C A Figure 1 4. What position tolerance is allowed for hole 2 if it is manufactured with a diameter of .539 inches? The MMC for hole 2 is 0.516 inches. At MMC the allowable tolerance is 0.015 inches. Since the hole was manufactured at 0.539 inches, the allowable tolerance is 0.038 inches. 5. If hole 1 is manufactured with a diameter of 0.530” and hole 2 is manufactured with a diameter of 0.528”, what is the closest allowable distance between the centers of these holes? Hole 1 will have an allowable tolerance of .029”. Hole 2 will have an allowable tolerance of .027”. The closest that the hole center points can be is 1.5 – 0.029/2 – 0.027/2 = 1.472 inches. 6. If hole 4 is drilled with a diameter of .335” before it is tapped, what is the perpendicularity tolerance that is allowed? The perpendicularity tolerance will be the same as the position tolerance. This is .018 inches. 7. What is the largest allowable distance between points E and F? 6.530 inches 8. Hole 4 is manufactured with a diameter of .332”. The horizontal location of the center of the hole is 1.245” as shown in Figure 2. What is the largest allowable vertical deviation of the location of the hole center? The allowable position tolerance is .015 inches. Thus the center of the hole must be within .0075 inches of the ideal location. The hole is off by .005 inches in the horizontal direction. The maximum allowable position error in the vertical direction can be calculated from Figure 2 .00752 .0052 y 2 Solving for y gives y = .0056 inches. 9. You are going to buy screws to insert into the threaded holes. What should be the major diameter and the number of threads per inch be for the screws? major diameter is 3/8 inches ; there will be 24 threads per inch 10. Why would it be inappropriate to have a feature control frame that specifies the position of the 1.73‐1.78” diameter center hole? The axis of the hole is designated as datum B and other features are dimensioned relative to that datum. ...
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