Learning Objectives:Performance Criteria:Resources in addition to Previous Reading Assignments, Hands-On Web Sites, Other Students, Class Notes, and Instructor:Plan:Critical Thinking Questions:METBD 110 Hands-On 8 Sketching and Dimensioning of Cylinders and Curved Surfaces Why: Sketching is used as a rapid thinking tool in developing design alternatives. Many common designs are not limited to straight edges, but utilize curves and cylinders. Engineers must be able to sketch the designs properly in order to communicate conceptual ideas. The ability to understand curves and cylindrical orthographic projections is another vital skill of the successful engineer. Learning Objectives: • To generate the correct standard orthographic views from a pictorial drawing which has curved surfaces and/or cylinders present. • Proper use of dimensioning lines and arrows. • Proper use of centerlines. Performance Criteria: • Professional appearance of the sketches. • Correct views are present. • Proper use of construction, object, hidden lines and centerlines. • Appropriate number of dimensions. • Appropriate location of dimensions. • Dimensions spaced and located properly. Resources in addition to Previous Reading Assignments, Hands-On Web Sites, Other Students, Class Notes, and Instructor: • Penn State Erie Standards Feature Dimensions • Dimension Modules: Lesson 3 • SI. • Tutors. Plan: 1. For each of the problems on the attached sheet, sketch the top, front and right side views on engineering calculation paper. Use the standard border and allow enough space between views to place dimensions. Each grid on the engineering paper equals 0.2. 2. Add the appropriate dimensions to the views to completely describe the size of the part. (Remember to use 2 place chain dimensions.) The general tolerance is ±.01. Design Intent: Given dimensions are the important ones. 3. Show construction work (lightly) for all circles and arcs. 4. Add the appropriate dimensions to the views to completely describe the size of the part. Critical Thinking Questions: 1. Name three ways curved surfaces can be dimension? 2. What difficulties were encountered in sketching the objects with curved surfaces? 8/6/03 110-hands-on-8.doc 1 of 2/6/03 110-hands-on-8.doc 2 of 2
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