Machine Design
The root angle of a bevel gear is equal to

Pitch angle - addendum angle
Pitch angle + dedendum angle
Pitch angle + addendum angle
Pitch angle - dedendum angle

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Machine Design
Set screws are

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

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