| . |
Materials
|
Drill Type
|
Drill Material
|
Point Angle
|
SFM
|
Feed Range No.
|
Coolant
|
Free - Cutting mild Steel hardness up to 72.000 psi (500 N/mm) tensile strength
|
N |
HSS |
118 (130) |
95 - 160 |
4 |
Soluble Oil |
Non-Alloyed carbon Steel with 0.4 % Carbon 113.000 psi
(800 N/mm2)
|
N |
HSS |
110 |
65 - 95 |
4 |
Soluble Oil |
Non-all Carbon steel with <0.4% carbon hardness 113.000-142.000psi
(800-1000N/mm2)and purified alloy steel with a hardness < 98.000 psi (700N/mm2) |
N |
HSS |
118 |
50-65 |
3 |
Soluble Oil |
| Alloyed tools steel hardness of 113.000-142.000 psi(800-1000N/mm2) and refined alloy steels with a hardness of 142.000-170.000 psi(1000-1200 N/mm2) |
N |
HSCO (HSS) |
180 (130) |
30-50 |
2 |
Soluble Oil |
| Refined alloy steels with a hardness of 170.000 psi (1200 N/mm2) |
N |
HSCO |
130 |
15-25 |
1 |
soluble Oil cutting Oil |
| Chrome-molybdenum stainless steels |
N |
HSCO |
130 |
25-40 |
1B |
soluble Oil
cutting Oil |
| Stainless, austenitic, nickel chrome, heat resisting steels |
N
s |
HSCO |
130 |
10-25 |
1 |
Cutting Oil |
| Managaxnese steels containing up to 10%molybdenum |
H |
HSCO |
130 |
10-15 |
1 |
dry |
| Spring steels |
N |
HSCO |
130 |
15-30 |
1 |
soluble Oil
Cutting Oil |
| Nimonic alloys |
s |
HSCO |
130 |
10-25 |
1 |
Cutting Oil |
| Ferro-tic |
N |
HSCO |
180 |
10-15 |
1 |
Dry-Compresses Air |
| Titanium and titanium alloys |
-
N |
HSCO |
130 |
10-15 |
1 |
Cutting Oil |
| Grey cast iron up to GG 26 and maileable iron |
N |
HSS(HSCO) |
118/90 |
50-80 |
5 |
Dry soluble Oil |
| Hard cast iron up to 350 brinell |
N |
HSCO |
118/90 |
25-40 |
4 |
Dry soluble Oil |
| Brass,to MS 58 |
H |
HSS |
118 |
200-260 |
6 |
Cutting Oil |
| Brass from MS 60 |
HN |
HSS
HSS |
118 |
100-200 |
5 |
soluble OilCutting Oil |
| Red copper |
N
S |
HSS
HSS |
130 |
100-200 |
5 |
soluble Oil Cutting Oil |
| electrolytic copper |
N |
HSS |
130 |
65-100 |
5 |
soluble Oil Cutting Oil |
| German silver |
N |
HSS |
180 |
65-100 |
3 |
Soluble Oil
Cutting Oil |
| copper -nickel and copper tin alloys |
N |
HSS |
130 |
65-100 |
3 |
Soluble Oil Cutting Oil |
| Copper - aluminum alloys |
N |
HSS |
130 |
30-100 |
3 |
Soluble Oil Cutting Oil |
| Alloys of Copper and Beryllium |
H |
HSS |
130 |
30-50 |
2 |
Cutting oil soluble Oil |
| Copper-manganese and Copper-silicon Alloys |
N |
HSS |
130 |
80-100 |
3 |
Cutting oil soluble Oil |
| Pure aluminum |
S |
HSS |
130 |
130-200 |
5 |
soluble Oil |
| aluminum-manganese and aluminum-chrome Alloys |
S |
HSS |
130 |
130-200 |
5 |
soluble Oi |
| aluminum Alloyed with lead, antimony or tin |
S |
HSS |
130 |
130-200 |
5 |
soluble Oi |
| aluminum-Copper Alloys containing silicon, magnesium, lead ,tin, titanium or beryllium |
S |
HSS |
130 |
130-200 |
5 |
soluble Oi |
| Magnesium Alloy (Electron) |
S |
HSS |
130 |
260-325 |
5 |
Dry |
| Zinc |
N |
HSS |
118 |
100-130 |
4 |
Soluble Oil |
| Hard Duroplastics |
S |
HSS |
80 |
30-65 160-325 |
3 |
Dry (Compressed Air) |
| Soft ThermoPlastic |
S |
HSS |
130 |
50-100 |
3 |
Water Compressed Air |
| Hardboard and the Like |
S H |
HSS |
130-80 |
50-80 |
3 |
Dry Compressed Air |
| State, Marble |
H |
HSS
(HM) |
80 |
10-15 |
Hand feed |
Dry Compressed Air |
| Graphite |
N |
HSS}
(HM)
|
80 |
10-15 |
Hand Feed |
Dry Compressed Air) |
| Hard Rubber |
H |
HSS |
80 |
50-100 |
6 |
Dry Compressed Air |
| Perspex |
H |
HSS |
130/70
|
50-80 |
3 |
Water |
Re: The Forgoing Recommendations hold good only, if the following conditions are met :
- Uniform Consistency of material to be drilled.
- Drills of ITM quality are used.
- ITM drills of HSS and HSCO quality are used.
- Max. Depth does not exceed three time the drill Diameter.
- Good Machine Condition and rigid mounting of the work piece
- No Drill Bushing are used.
- Correct quality of Coolant and sufficient flow.
- excessive run-out of the machine spindle or Drill.
With these point in mind, the figures in the table may be increase or reduce accordingly. |
