Shawlands Academy Department Of Technical Education

1. Shawlands AcademyDepartment Of Technical Education Graphic Communication

2. Oblique Projection • Oblique views are one of the forms of 3D views that you need to know about in the Standard Grade Graphic Communication course. • This type of drawing shows the length, breadth, and height of the object being drawn. • An Oblique view is drawn with the front surface of the object closest to the viewer. • One of the advantages of using Oblique views is that any circles or curves facing the front of the object can be drawn accurately using compass’s.

3. Cabinet Projection Cavalier Projection Oblique Projection • The depth of the view can be drawn at full size (cavalier projection) or the view can be drawn at half size (cabinet projection). • The advantage of using Cabinet Projection is that the view looks more realistic than Cavalier Projection which can look distorted. • If you are thinking about progressing to the Higher Graphic Communication course you will only be asked to draw Oblique Views in Cabinet Projection, and in this case it would make sense to use this type of projection for this course.

4. Oblique Projection • If you are sitting an SQA Graphic Communication exam, there is a chance that you will be asked to draw an Oblique View in the General exam. • This type of drawing has been included in the final paper for the past four years. • The drawing included in the exams have always included circles or curves on the front surface.

5. Oblique Projection

6. Oblique Projection • The given views show the orthographic views of a mantle clock. • Draw an oblique view with corner X in the given position. • Do not add the hands of the clock to your drawing. X X X

7. X X Drawing Oblique • Start the oblique view by drawing a crate to fit the clock into. In this case the size of the crate will enclose the body of the clock but does not include the clock face. This will be added to the main drawing later. For Standard Grade drawings the depth of the crate should be drawn at 45o with the size measured at either full size or half full size. In this case half sizes have been used. X

8. X X Drawing Clock Top • Draw the top curve of the clock body on the front surface of the crate. • Project the centre of the curve back at 45o to locate the centre of the back curve. • Draw a 45o line through each centre to find the tangent points where the curves are joined by straight edges. X

9. X X Drawing Clock Face • Draw the circle for the face on the front surface of the clock body. • Locate the centre of the clock face at the very front of the drawing. • Remember that the distance in this drawing is half of the full size. • Draw the outside circle and the inside circle of the clock face. • Locate the tangent points on the face circles and add the straight edges required. X

10. X X Drawing Clock Base • Add the feet details to the drawing. • Remember to use half sizes for any dimensions which are measured along 45o lines. X

11. X X Finishing Drawing • To finish the drawing, darken in the outlines of the oblique view. X

12. X X Oblique view using full sizes (Cavalier Projection) Oblique view using half full sizes (Cabinet Projection) Alternative Oblique View • At Standard Grade an Oblique View may be drawn with the dimensions on the 45o angles at full size or half full size. • The two drawings shown here show the different views generated by both methods.

13. PowerPoint Presentation produced by John McRae, Nairn Academy 2003 Department Of Technical Education