Construct the tooth geometry (arcs or other required curves). draw a line from the center to the toe of the Dedendum/Edge of the Bottom land (without its Fillet radius) draw a line from the center to the other edge of the same Bottom land (without its Fillet radius) draw a line from the center to each end of the Tooth thickness (intersecting the Pitch circle) draw lines from the center to the left and the right of the Top land. It could help to layout a few radial lines that show where the key points of a single tooth are. To create your spur gear, first you should draw a single tooth of your gear. As you can see, the array polar command creates multiple copies of the selected geometry rotated about the center point. I'm not sure where they were going with those instructions.
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