Question

the lip clearance angle of twist drill for general purpose should be​

Answer 1

Answer:

12°

Lips clearance angle

Lip clearance is the relief given to the cutting edges that allow drill to enter into the workpiece without any hindrance. In general purpose drills, the clearance angle behind the cutting edge is 12°.

Answer 2

Answer:

lip clearance angle should be 8 to 12 degree.

Explanation:

Lip clearance angle

• The cutting edges will be weak if the clearance angle is too great, and the drill will not cut if it is too narrow.
• Therefore, 8 to 12° should be the ideal lip clearance angle for twist drills used for common purposes.
• This angle is made up of the flank and a plane that is parallel to the axis.
• The relief provided to the cutting edges known as "lip clearance" enables the drill to enter the workpiece without any resistance.
• The clearance angle behind the cutting edge in general-purpose drills is 12°.
• Due to insufficient support, a clearance angle that is too great will result in the drill's lip fracturing.
• The cutting edge should have a minimum clearance angle to ensure sufficient strength and stiffness.
• Drills with insufficient clearance have little to no cutting edge.

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