School of Technology

TECH 13580 - Engineering Graphics I

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MAJOR CONCEPTS 

A. "Slanting" = meaning of oblique

B. Face of oblique resembles orthographic with square corners.

C. Any convenient angle used for depth

D. Receding axis direction has four possibilities ( face, top, right side or face, top, left side or face, bottom, right side or face, bottom, left side ). 

E. Cavalier oblique has depth at full scale. 

F. Cabinet oblique has depth at half scale to improve appearance, especially furniture.

G. Rules of position :

1. Locate long axis on picture plane.

2. Locate arcs, circles, irregularities on or parallel to picture plane to avoid ellipses and distorted angles while improving appearance and saving time. 

- Usually this rule is more important than long axis rule.

H. Oblique circles are circles on face of object ( if perpendicular to base ), but become ellipses when holes are on object's top or sides, in which case use the approximate- four-center-method . Curves on surfaces sloping from face become ellipses and are drawn by offset method. . Holes on surfaces other than face become ellipses ( as stated above ) , but for a cabinet oblique must be drawn ( tediously) by the offset method .

A. Sections in oblique are shown in. Note the crosshatching direction change

B. Hidden lines in oblique drawings usually are not drawn.

C. Dimensioning an oblique drawing is shown in .

D. Creating an oblique projection is shown step-by-step in .

E. Selecting between isometric and oblique usually suggests that objects mostly with flat surfaces, such as boxes, are more realistic