Fall_2007_Hwk5_solution

Fall_2007_Hwk5_solution - MAE 94 Homework Set # 5 Solutions...

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Unformatted text preview: MAE 94 Homework Set # 5 Solutions Name: SID: (30 points) Problem 1: 1. List five (5) reasons why dimensioning is important in Engineering Drawings I ‘ Answer: It is important to apply rules and standards in Dimenswnmg (and toleranclng) in Engineering Drawings for the following reasons: 0 Cia rity - Neatness o Simplicity 2’ o Esthetics, and Legal responsibilities 2. Name the two dimensioning methods. Answer: Chain Dimensioning Method & Datum Dimensioning Method 3. What is a reference dimension? Answer: When one dimension in a chain is not omitted, it is marked as REF (reference) dimension, meaning this dimension is being provided as a reference only. Giving a reference dimension is a way of eliminating arithmetic calculations in the manufacturing shop. 4. Why does one need dual dimensioning? Answer: Dimensions both in inch and Si systems, called dual dimensioning, are needed when the drawings are needed to communicate across countries that follow different (SI or inch) systems. In a global economy, parts are dimensioned in one country and manufactured in another country. Specifying dimensions in both systems can be helpful. 5. What isaleader line? What does it look like? Answer: Leaders are thin lines drawn from a note to a feature the note applies to. A leader line consists of an arrowhead. a line at an angle and a horizontal bar. The arrowhead points to the feature and the note begins where the horizontal bar ends. 6. Give the abbreviations used for Countersink, Counterdrilled hole, and Counterbore in engineering drawing Answer: Abbreviations are: CSK, CDRlLL and CBORE 7. Sketch the symbols for Depth, Dimension origin, Square shape, and Diameter used in engineering drawing Answer: The symbols are indicated below each item: Depth: Dimension origin: Square shape: Diameter LSH 8. Describe three rules for dimensioning prisms. i) First row should be three times letter height from part ii) Place dimensions between views iii) Dimension the most descriptive views 9. Describe two rules for dimensioning cylindrical parts and holes. 1) Dimension cylinders in their rectangular views with diameters ii) Dimension holes in circular views iii) Stagger dimension numerals (on concentric cylinders) to prevent crowding 30. Describe two rules for dimensioning arcs and radii. i) Dimension arcs (less than 180 degrees) with radii ii) When space permits, place dimensions and arrows between the center and the arc. (40 Points) Problem #2: Completely dimension the two views shown below. 95-750 ——\ . _ (A W figmcagEfiEP \ ‘37:) \ masofi 952.00 use» {LSK 2x H.3l25—\ l I | ,7_..__L_..J.« ,.L __. .. “J l ...
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Fall_2007_Hwk5_solution - MAE 94 Homework Set # 5 Solutions...

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