Machine
Drill angle and helix angle
Machine
drill rake angle of any cutting tools differ from material
to material, correct clearance on drill angle and tip angle
results 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
|
| |
|
|
|
