manufacturing


 

 

Engineering, Design, and Manufacturing Knowledge

Drill angle and helix angle

drill
Rake angle of any cutting tools differ from material to material, correct clearance angle and tip angle result in better product finishing and smoother cutting and better tool life.

 

Material to be drilled
Tip angle
Helix angle
Steel, cast iron, Gray cast iron, malleable cast iron, German silver and nickel
118
30
Brass, CuZn 40
118
13
Stainless steel
140
30
Copper, Al alloys
140
40
Austenitic steel, Magnesium alloys
140
13
Engineering plastic
80
40
Rubber, Marble, slate, coal
80
13
Sinc Alloys
118
40