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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