Machine Design
The backlash for spur gears depends upon

Both module and pitch line velocity
Module
Tooth profile
Pitch line velocity

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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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Machine Design
Machine screws are

Used to prevent relative motion between two parts
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
Similar to stud

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