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Speed & Feed Charts
Single Flute Gun Drill Speed & Feeds
Spindle Speeds
RPM=SFM ÷ 0.262 ÷ DRILL DIA.
Speed and Feed assumes proper bushings, supports, oil type, pressure, and general machine condition is acceptable. Use as a starting reference only!
High pressure (SFM chart) refers to a gun drill machine or the equivalent through tool oil or coolant pressure on conventional and CNC machines.
| TOOL STEELS |
| D,S,M,O,H,P Series |
Hi Pressure |
| Rc |
SFM |
|
| 17-22 |
250 |
| 22-27 |
200 |
| 27-32 |
150 |
| 32-37 |
100 |
| |
| ALLOY STEELS |
| 4000, 5000, 8000 Series |
|
| Rc |
SFM |
|
| 17-22 |
300 |
| 22-27 |
250 |
| 27-32 |
200 |
| 32-37 |
150 |
| 37-42 |
100 |
| |
| Low to Med. CARBON STEEL |
| C1010-1550 |
| Rc |
SFM |
|
| 12-17 |
400 |
| 17-22 |
350 |
| 22-27 |
300 |
| 27-32 |
250 |
| 32-37 |
200 |
| 37-42 |
150 |
| |
| STAINLESS STEEL* 300
Series |
| 300 Series & PH |
| Rc |
SFM |
|
| 12-17 |
230 |
| 17-22 |
200 |
| 22-27 |
170 |
| 27-32 |
140 |
| 32-37 |
110 |
| 37-42 |
80 |
| Free Machining |
+ 30% |
| |
| STAINLESS STEEL *
400 Series |
| 400 Series |
| Rc |
SFM |
|
| 12-17 |
280 |
| 17-22 |
240 |
| 22-27 |
200 |
| 27-32 |
160 |
| 32-37 |
120 |
| 37-42 |
80 |
| Free Machining |
+ 30% |
| |
| CAST IRON |
| Grey |
| Rc |
SFM |
|
| 12-17 |
400 |
| 17-22 |
350 |
| 22-27 |
300 |
| 27-32 |
250 |
| With Free Carbides |
-50% |
| Ni-Resist |
-60% |
| |
| CAST IRON |
| Ductile, Nodular |
| Rc |
SFM |
|
| 12-17 |
300 |
| 17-22 |
250 |
| 22-27 |
200 |
| 27-32 |
150 |
| 32-37 |
100 |
| Ductile, Ni-Resist |
-50% |
| |
| TITANIUM* |
| 6A1 4V, Some Others |
| Rc |
SFM |
|
| 12-17 |
260 |
| 17-22 |
220 |
| 22-27 |
180 |
| 27-32 |
140 |
| 32-37 |
100 |
| 37-42 |
60 |
| |
| HIGH TEMP. ALLOYS* |
| Nickel Based |
|
| Rc |
SFM |
|
| 12-22 |
120 |
| 22-32 |
90 |
| 32-42 |
60 |
| Cobalt Base |
-40% |
| Iron Base |
+20% |
| |
| COPPER ALLOYS* |
| Berryllium, Ni-Based |
|
| Rc |
SFM |
|
| 12-22 |
200 |
| 22-32 |
130 |
| 32-37 |
60 |
| |
| SOFT ALLOYS Non Ferrous |
| Aluminum, Copper, Free Brass, Magnesium |
500 - 600 SFM |
| All Conditions |
|
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- Consult Sterling Gun Drills to verify application requirements.
- High SFM will cause vibration and/or harmonics with long gun drills. Reduce RPM or ensure adequate supports are in place or use an intermediate length gun drill.
- Minimum oil/coolant pressure is 35% of the PSI values on page 2. If at minimum, reduce SFM by 35%.
- Applications suitable for our Spraymist System, reduce SFM by 35% at same feed rate listed.
- Water soluble coolant must be oil based, high “EP” at 10-12% concentration, NO SYNTHETICS!
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Approximate Feed Rate (IN./REV.)
Dia.
(inch) |
Steels
Low, Med.
Carbon |
Steels,
Alloy,
Tool,
Fe Stainless |
Ni Stainless
Titanium,
High Temp.
|
Cast Iron,
Grey,
Free cut Alum. |
Cast Iron,
Ductile,
Nodular |
Poor Chipping
Alum. 6061 ex.
Copper |
|
| <.055"* |
.00005" |
.00005" |
.00005" |
.00007" |
.00007" |
.00005" |
| .062"* |
.00006" |
.0006" |
.00006" |
.00080" |
.00008" |
.00006" |
| .078" |
.00008" |
.00008" |
.00007" |
.0001" |
.0001" |
.00007" |
| .094" |
.0001" |
.0001" |
.00008" |
.00015" |
.00015" |
.00008" |
| .125" |
.00015" |
.00015" |
.0001" |
.0002" |
.0002" |
.0001" |
| .187" |
.003" |
.0003" |
.0002" |
.0004" |
.0003" |
.0002" |
| .250" |
.00045" |
.00045" |
.0003" |
.0008" |
.0006" |
.0003" |
| .375" |
.0007" |
.0006" |
.0005" |
.0015" |
.001" |
.0005" |
| .500" |
.0008" |
.0007" |
.0006" |
.002" |
.0015" |
.0007" |
| .625" |
.001" |
.0009" |
.0007" |
.0025" |
.002" |
.0009" |
| .750" |
.0013" |
.0011" |
.0008" |
.003" |
.0025" |
.0011" |
| 1.00" |
.0016" |
.0013" |
.001" |
.0035" |
.003" |
.0015" |
| 1.25" |
.0018" |
.0015" |
.0012" |
.004" |
.0035" |
.0018" |
| 1.50" |
.002" |
.0018" |
.0014" |
.005" |
.004" |
.002" |
|
| *Solid carbide flute & tip. |
| Drill lengths over 50:1, reduce feed rate by 20%. |
Oil Pressure, GPM, Unsupported Drill Length
Gun Drill Machine
Diameter
(inches)
|
Oil Pressure
(PSI)
|
GPM |
Max. Unsupported Length |
| (per spindle) |
High SFM |
Low SFM |
| <.055"* |
2500 |
.20 |
N/A |
N/A |
| .062"* |
2000 |
.25 |
N/A |
N/A |
| .078" |
1800 |
.35 |
3" |
5" |
| .094" |
1500 |
.50 |
4" |
6" |
| .125" |
1500 |
.90 |
5" |
8" |
| .187" |
1150 |
1.60 |
6" |
12" |
| .250" |
925 |
2.50 |
8" |
16" |
| .375" |
675 |
4.50 |
12" |
24" |
| .500" |
525 |
7.00 |
16" |
32" |
| .625" |
450 |
10.0 |
20" |
40" |
| .750" |
400 |
14.0 |
24" |
48" |
| 1.00" |
300 |
20.0 |
32" |
56" |
| 1.25" |
250 |
28.0 |
40" |
64" |
| 1.50" |
200 |
36.0 |
48" |
72" |
- Minimum oil/coolant pressure is 35% of the PSI values. If at minimum, reduce SFM by 35%.
- Water soluble coolant must be oil based, high “EP” at 10-12% concentration, NO SYNTHETICS!
- * Solid carbide flute & tip
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