Machine Design
For hardening alloy steels and high speed steels, they are heated to

500 to 600°C
1300 to 1500°C
700 to 900°C
1100 to 1300°C

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Machine Design
In worm, gears, pitch lead angle is

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

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