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

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Machine Design
Set screws are

Slotted for a screw driver and generally used with a nut
Similar to stud
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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