CARBIDE
List 215, 220D, 200 & 233* (Continued)
Aerospace Operations Work Material
Graphite Composite Titanium Stack
Graphite Composite
Epoxy Fiber
Acrylic Plastics
Drilling Speed
200-220 SFM
200-220 SFM
150-170 SFM
12-20 SFM
Drill Dia.
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Speed RPM
Feed IPR
mm Inch 3 –
6,800 6,400 5,100 3,400 3,200 2,550 2,140 2,030 1,700 1,600
0.0017-0.0022 0.0015-0.0025 0.0020-0.0030 0.0025-0.0035 0.0035-0.0045 0.0035-0.0045 0.0045-0.0055 0.0055-0.0065 0.0055-0.0065 0.0060-0.0070 0.0065-0.0075 0.0065-0.0075
6,800 6,400 5,100 4,250 3,400 3,200 2,550 2,140 2,030 1,830 1,700 1,600
0.0017-0.0022 0.0015-0.0025 0.0020-0.0030 0.0025-0.0035 0.0035-0.0045 0.0035-0.0045 0.0045-0.0055 0.0055-0.0065 0.0055-0.0065 0.0060-0.0070 0.0065-0.0075 0.0065-0.0075
5,200 4,900 3,900 3,250 2,580 2,450 1,950 1,630 1,550 1,400 1,280 1,200
0.0017-0.0022 0.0015-0.0025 0.0020-0.0030 0.0025-0.0035 0.0035-0.0045 0.0035-0.0045 0.0045-0.0055 0.0055-0.0065 0.0055-0.0065 0.0060-0.0070 0.0065-0.0075 0.0065-0.0075
520 490 390 325 260 245 195 165 155 140 130 120
0.0008-0.0013 0.0010-0.0015 0.0010-0.0020 0.0015-0.0025 0.0015-0.0025 0.0020 -0.0030 0.0025-0.0035 0.0030-0.0040 0.0035-0.0045 0.0035-0.0045 0.0040-0.0050 0.0040-0.0050
– 4 – 6 – 8 –
1/8
–
3/16 4,250
–
1/4
–
3/8
10
–
–
7/16 1,830
12
–
–
1/2
The chart above is for materials typically used in aircraft structures. Speeds may be less than optimal because of limitations in the portable machine tools utilized. *When using our List 233 three flute drills we recommend the same RPM but feed rates should be increased by 25-35%.
Reduce Spindle Speed
Hole Depth Diameters
When drilling deep holes, the recommended speeds and feeds should be reduced proportionately based on the hole depth. To the left are guidelines for reducing the speeds and feeds.
Reduce Feed Rate
10% 10% 20% 20% 20%
10% 20% 30% 35% 40%
3 x Dia. 4 x Dia. 5 x Dia. 6 x Dia. 8 x Dia.
340
Drilling Technical
osgtool.com
Powered by FlippingBook