Question
Download Solution PDFThe point angle of twist drill depends upon the _________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Drilling is a cutting process in which a hole is originated by means of a multi-point, fluted, end cutting tool.
- As the drill is rotated and advanced into the workpiece, the material is removed in the form of chips that move along the fluted shank of the twist drill.
- The point angle is the angle between the cutting edges (lips).
-
The point angle varies according to the hardness of the material to be drilled
Tool geometry:
The figure showed the three most common angles,
- Point angle
- Helix angle
- Lip relief angle
The standard point angle of 118° is most common and the standard helix angle is 27.5°.
Last updated on Jun 26, 2025
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