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How do you recognize a drill for soft metal

How do you recognize a drill for soft metal Correct Answer By the large helix angle

Explanation:

  • Drilling is the production of cylindrical holes of definite diameters in workpieces by using a multi-point cutting tool called a ‘drill’.
  • Drills are manufactured with varying helix angles for drilling different materials.
  • General-purpose drills have a standard helix angle of 27½°; They are used on mild steel and cast iron
  • Drills with a helix angle of 20° are known as slow helix drills or small helix angle drills. These are available with a point angle of 118 for cutting harder materials such as brass and bronze
  • Quick helix drills or large helix angle drills, with a helix angle of 40° and a point angle of 100°, are suitable for drilling the softer materials such as aluminium alloys and copper

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The chart shows the angles used for a particular material:

Material

Point angle (in °)

Helix angle (in °)

Lip angle (in °)

Aluminium

90 to 135

32 to 48

12 to 26

Brass

90 to 118

0 to 20

12 to 26

Cast Iron

90 to 118

24 to 32

7 to 20

Mild Steel

118 to 135

24 to 32

7 to 24

Stainless Steel

118 to 135

24 to 32

7 to 24

Plastics

60 to 90

0 to 20

12 to 26

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