What are the angles on a drill bit?

A drill bit has two cutting surfaces, one on each side of its center axis, that are cut at an angle of approximately 60 degrees.

Why drill bit angle is 118?

The two most common drill bit point angles are 118 degrees and 135 degrees. The difference between the two is the shape; a 118-degree bit is steeper, more pointed and has a smaller chisel. The 118-degree bit cuts more aggressively and is generally used for drilling into soft material like wood.

How is drill angle calculated?

The Drill Point Angle in for given Length Of Approach is a method to determine the angle made by the two major cutting edges of a drill bit at its head when the perpendicular height of the tip-cone is known is calculated using Drill Point Angle = atan(0.5*Diameter of drill bit/Length of Approach).

What is better 118 degree or 135 degree drill bits?

The 118 is generally used for drilling into soft material like wood. Although it can puncture through steel, this will also cause it to dull quicker. A 135 is typically used for drilling into hardened material. Due to the amount of pitch, this makes it easier to drill repeated holes into hard material.

What is point angle?

1. A geometric figure formed by two lines that begin at a common point or by two planes that begin at a common line. 2. The space between such lines or planes, measured in degrees.

What is the best drill bit angle?

For hard materials such as steel and stainless, 135-degree bits are best. The shallow angle allows the bit to cut into the material without dulling quickly, however that same shallow angle makes for a bit that wants to walk around, requiring a center punch. The 135 angle is much flatter, as you can see here.

How is drill point length calculated?

So if you would need 1″ full diameter hole depth with a . 5 drill, you would drill 1.150″ deep. For a 135 degree drill tip, the formula would be 22.5tan(radius).