Machine Design
The face of the tooth is the

Surface of the tooth above the pitch surface
Surface of the top of the tooth
Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Axial load plus stress due to acceleration/retardation
Axial load plus stress due to bending
Acceleration/retardation of masses plus stress due to bending
Bending plus stress due to acceleration/retardation

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