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Following which things must be watched when sharpening a drill.

Following which things must be watched when sharpening a drill. Correct Answer Angle of lips

Explanation:

  • Drilling is the production of cylindrical holes of definite diameters in workpieces by using a multi-point cutting tool called drill.
  • The lips, also known as cutting edges, are the edges formed by the intersection of flanks and faces.
  • They are two in number with identical lengths and angles.
  • While sharpening a drill, only two edges are sharpened as they are used to cut the metal.

 

Additional Information 

  • The point angle of a general purpose (standard) drill is 118°.
  • This is the angle between the cutting edges (lips).
  • The angle varies according to the hardness of the material to be drilled.

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