Theory of Machine
To obviate axial thrust, following gear drive is used

Double helical gears having identical teeth
Mutter gears
Single helical gear in which one of the teeth of helix angle a is more
Double helical gears having opposite teeth

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Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

Vector sum of radial component and Coriolis component
Vector sum of radial component and tangential component
Vector difference of radial component and tangential component
Vector sum of tangential component and Coriolis component

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