Machine Design
A woodruff key is

A tapered key with head at one end
All of these
Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open belt drive transmits more power than crossed belt drive
Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
Crossed belt drive transmits more power than open belt drive

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