Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

⅟₂ × (P1 + P2)
P1 - P2
P1 + P2
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
A woodruff key is

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

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