Presentation on theme: "Graphic Communication"— Presentation transcript:
1 Graphic Communication DepartmentofTechnologicalEducation
2 Interpenetration of 2 Cylinders Department of Technological EducationInterpenetration of 2 CylindersThe drawing shows the part Plan and part Front Elevation of an interpenetration between two cylinders.Draw :-The completed ElevationThe completed PlanThe End Elevation
3 Drawing Generators on Plan and Elevation Department of Technological EducationDrawing Generators on Plan and ElevationDivide the Elevation and Plan into 30o/60o parts and number each of the points.910/811/712/61/52/43Draw generators from these points on the Plan until they cut the main cylinder.11/110/2129/3Project the generators on the Elevation parallel to the angle of the sides of the small cylinder.8/47/56
4 Finding Points of Interpenetration Department of Technological EducationFinding Points of InterpenetrationProject points from Plan where generators cut the main cylinder.12/11/10/1298763/4/5Mark where each of the projected lines cross the appropriate generators on the Elevation with a small dot.1211/10/9/8/7/612345Draw a smooth curve through each of the points.This line of interpenetration can now be darkened.
5 Drawing Generators for End Elevation Department of Technological EducationDrawing Generators for End ElevationFind the position of the End Elevation.12/11/10/1298763/4/5Project the 12 points from the Plan onto the End Elevation.Number the points found on the End Elevation.1011121293876541211/10/9/8/7/612345
6 Finding Points of Interpenetration on End Elevation Department of Technological EducationFinding Points of Interpenetration on End ElevationProject the points from the curve of interpenetration on the Elevation across to the End Elevation.12/11/10/1298763/4/5Mark where these lines cross the appropriate generator on the End Elevation with a small dot.9845673211211101211/10/9/8/7/612345Draw a smooth curve through each of the points.
7 Drawing End Ellipses of Small Cylinder Department of Technological EducationDrawing End Ellipses of Small CylinderProject the points where the generators on the Elevation cross the end of the small cylinder across to the End Elevation.12/11/10/1298763/4/5Where they cross the corresponding generators draw a small dot, and draw a smooth line through each.9845673211211101211/10/9/8/7/612345Do the same thing to find the curve on the Plan.
8 Finishing the Drawing Department of Technological Education To finish the drawing each of the outlines should be darkened.Make sure that any hidden lines are identified when darkening the outlines.12/11/10/1298763/4/59845673211211101211/10/9/8/7/612345
9 The Final Drawing Department of Technological Education The final drawing should look like this.The construction lines have been removed to make the drawing easier to understand.
10 PowerPoint Presentation produced by John McRae, Nairn Academy 2003