If the abrasive grain is viewed as a cutting tool, then

If the abrasive grain is viewed as a cutting tool, then which of the following represents the cutting parameters in common grinding operations?

1. Large negative rake angle, low shear angle and high cutting speed
2. Large positive rake angle, low shear angle and high cutting speed
3. Large negative rake angle, high shear angle and low cutting speed
4. Zero negative rake angle, high shear angle and high cutting speed

Large negative rake angle = α = (–40°) → average value hence low shear angle & higher cutting speed.