Machine Design
Set screws are

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

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is equal to centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Effective tension is half of centrifugal tension

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Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf
Make M/I constant throughout the length of the leaf
Permit each leaf to act as an overhanging beam

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