How to Draw Spur Gears
Spur gears are one of three basic gear systems. The teeth of the spur gears connect to other gears, which in turn connect moving parts in a machine. If you're interested in drawing spur gears, take some time to examine what a spur gear looks like. Essentially, the spur gear looks like a doughnut that's completely covered by triangular-shaped teeth. By mastering a few simple drawing techniques (such as drawing circles and triangles), you can draw a basic spur gear.
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Instructions
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1
Find a picture of a spur gear and study it. You can find pictures of spur gears in many construction and machinery magazines. A picture of a spur gear is available at winchbin.com (see Resources).
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2
Draw a circle on the paper using a compass. This first circle will act as the center of the spur gear.
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3
Lightly draw a larger circle around the circle you drew in Step 1. Start at the center of your first circle and spread the legs of your compass wider, then draw the larger circle so that it encompasses the first circle.
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4
Draw triangular teeth on the outside of your larger circle. The teeth should start and end on the outer circle's lines, and all teeth should be the same size. Space the triangles out so that they're not touching each other; there should be equal space between each triangle.
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5
Square off the teeth by drawing a line on each tooth to cut off the tip of each triangle. Spur-gear teeth are not pointed---they're squared off. Erase the tips of your triangles.
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6
Erase the lightly drawn larger circle; be careful not to erase the teeth you drew in Step 4. To finish your spur gear, erase the larger circle and leave only the inner circle and the teeth of the gear. Darken the lines of the inner circle and the gear teeth.
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