End Cutting Edge Angle and Nose Radius

End Cutting Edge Angle

End cutting edge angle vary from 4° to 30°. End cutting edge angle stop rubbing between the end of the tool and the workpiece. If end cutting edge angle is less, it will cause vibration due to excessive tool contact with workpiece. With end cutting edge angle, surface finish decreases and vice-versa.

Nose Radius

Nose radius is provided to enhance strength of tip of the tool. It is done by thinning the chip where it approaches tip of tool and by enlarging the chip over a larger area of the point. It is also provided to enhance the surface finish. If the radius is more, the surface finish will be good. But because of too large nose radius, contact between tool and workpiece increases, which in turn enhance friction. Therefore, power consumption increases, along with enhance in vibration and chatter occurs.