Enter the drill diameter and the point angle into the calculator to determine the drill point length. This calculator helps in identifying the correct length of the drill point based on the drill size and the desired point angle.
Drill Point Length Formula
The following formula is used to calculate the drill point length.
L = (D / 2) / tan(θ / 2)
Variables:
- L is the drill point length (inches)
- D is the drill diameter (inches)
- θ is the point angle (degrees)
To calculate the drill point length, divide the drill diameter by two, and then divide that result by the tangent of half the point angle.
What is Drill Point Length?
Drill point length is the length from the extreme end of the cutting edge to the farthest point on the drill’s axis. It is an important dimension for drill bits as it determines the size of the hole that the drill can create. The point length is influenced by the drill diameter and the point angle, which is the angle formed at the tip of the drill bit. Proper calculation of the drill point length is crucial for precision in drilling operations.
How to Calculate Drill Point Length?
The following steps outline how to calculate the Drill Point Length.
- First, determine the drill diameter (D) in inches.
- Next, determine the point angle (θ) in degrees.
- Next, gather the formula from above = L = (D / 2) / tan(θ / 2).
- Finally, calculate the Drill Point Length (L) in inches.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
drill diameter (D) = 0.5 inches
point angle (θ) = 118 degrees
