Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Addendum circle diameter × cosφ
Clearance circle diameter × cosφ
Pitch circle diameter × cosφ
Pitch circle diameter × sinφ

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Machine Design
The face of the tooth is the

Surface of the top of the tooth
Surface of the tooth above the pitch surface
Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle

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Machine Design
Set screws are

Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts

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