Machine Design
The ball bearings are, usually, made from

Low carbon steel
Medium carbon steel
High carbon steel
High speed steel

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and the plane of rotation
The angle between the tangent to the pitch helix and an element of the cylinder
None of these
Half the angle between two inclined faces in axial plane

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