Machine Design
The flank of the tooth is the

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

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Machine Design
The elasticity is the property of a material which enables it to

Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Resists fracture due to high impact loads
Retain deformation produced under load permanently

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