Apex angle (cutting angle)
1.Around 118°:
- Use: This is the most common standard apex angle. Good for drilling common metal materials like steel, iron, and copper.
- Many people widely use it in regular machining, and it can meet most drilling needs. For metal materials with moderate hardness, a drill bit with this angle offers a good balance of cutting force and speed. This helps achieve high drilling efficiency.
- Characteristics: For these softer materials, a larger apex angle can lower the cutting force. This helps avoid issues like tearing and deformation during drilling.
2.Greater than 118° (such as 135°):
- Use this angle for drilling softer materials. It works well on non-ferrous metals, such as aluminum and copper. Also, it is good for non-metallic materials like plastic and wood.
- For these softer materials, a larger apex angle can lower the cutting force. This helps avoid issues like tearing and deformation during drilling. When drilling thin plate materials, workers often use a drill bit with a larger apex angle. This helps reduce the "punching in" effect and makes drilling more stable.
- Characteristics: The cutting edge is somewhat blunt. However, the cutting force is small. This makes the drilling process stable. Damage to soft materials is less likely.
3.Less than 118° (such as 95°):
- Use: Mainly used for drilling hard materials such as hardened steel and hard alloys. A smaller apex angle can increase the strength and rigidity of the drill bit. When drilling hard materials, it can withstand greater cutting forces without easily sustaining damage.
- Also, when you need high-precision drilling, you can use a small apex angle drill bit. Its cutting edge is focused, which helps improve drilling accuracy and surface quality.
- Characteristics: The cutting edge is focused and strong. However, it requires a lot of force, and the drilling speed is slow.
Summarize
In daily work and life, 118 degree point and 135 point degree drill bits appear much more frequently. They are also the most popular choices.
MRCM drill bit sharpeners can sharpen to both 118 and 135 common point angles. The MR-13A can grind drills with angles from 95 to 135 degrees. MR-X3 can grind 4-flute end mills.
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