What is the drill point length for 14 Dia drill with point a

What is the drill point length for 1/4 Dia. drill with point angle of 135 degree? [Constant value for 135 degree is 0.207]

Solution

answer is 1.314

TIP: The length of the drill point is determined by the tool point angle and the drill diameter. You can calculate the length of the drill point by multiplying the drill diameter by a constant; the value of the constant depends on the drill point angle (most standard high-speed steel drills have a tool point angle of 118 degrees).