The formula to calculate the Drill Point Length (L) is:
\[ L = \frac{D}{2 \times \tan(\frac{θ}{2})} \]
Where:
Drill point length is the distance from the extreme end of the cutting edge to the farthest point on the drill’s axis. It is a critical dimension for drill bits as it determines the depth and size of the hole that the drill can create. The drill point length is influenced by both the drill diameter and the point angle, with precision in this measurement being vital for accurate drilling operations.
Let's consider an example:
Using the formula to calculate Drill Point Length:
\[ L = \frac{0.5}{2 \times \tan(\frac{118}{2})} \approx 0.15 \, \text{inches} \]
This means that the drill point length is approximately 0.15 inches.