Relief angles on high speed steel tools usually vary from

Solution (By Examveda Team)

The relief angle, also known as the clearance angle, is a crucial angle in cutting tools like those made of high-speed steel (HSS).

Why is it important?
Imagine a tool cutting into material. If the flank (the side just behind the cutting edge) rubs against the workpiece, it creates friction and heat.
The relief angle prevents this rubbing.
It provides clearance between the flank and the machined surface.

What does it do?
Reducing friction, which then reduces heat and wear on the tool.
Leading to a better surface finish on the workpiece.
Allowing the tool to cut more efficiently.

How much relief angle is needed?
Too little relief angle and you get rubbing (bad!).
Too much and the cutting edge becomes weak and might chip or break.

Typical Values:
For HSS tools, the relief angles are generally kept relatively small to maintain the strength of the cutting edge.
The most common range for relief angles on HSS tools is 3° to 10°.

Therefore, the correct answer is Option B: 3° to 10°