Sunday, January 28, 2018

Rotations, Spirals, and divisions with ellipses (Concept drawing)

Rotations for hinges can be accurately drawn using the techniques in my last post with ellipses drawn on surfaces by drawing along ellipses. Drawing a shape on any of the axis's presented by the ellipse can represent a door at any angle of the swing as an example.



To subdivide an ellipse, draw a half circle parallel to the ellipse drawn on a surface. Divide this half circle into even “pie slices” with a protractor or just eyeball it. Then, draw parallel lines through the intersecting points of the circle over to the vertical line of the ellipse, and then connect them to the other end of the surface following the vanishing point. Mark the intersection of the ellipse and the lines previously drawn and connect them to the center for perfect divisions on the ellipse. According to Scott Robertson, “being able to subdivide am ellipse will help with drawing things like spiral staircases, equally spaced links on a tank tread, hour positions on a clock, or teeth around a gear” (Robertson 16). These techniques are shown in this drawing of a gear that I drew. 
Question: What careers go with the style of concept drawing and drafting?  

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