Page 122 - Cobra-Carbide-2020-Catalog

JOBBER DRILLS

Speeds & Feeds

DRILLS

MICRO GRAIN SOLID CARBIDE
JOBBER LENGTH DRILLS

Cutting Speed
Material Group Material Type
m/min SFM
Steel Structural Steel 60 - 70 197- 230
Free Cutting Steel 60 - 70 197 - 230

Unalloyed Heat Treatable Steel 60 - 70 197 - 230
Unalloyed Case Hardened Steel 60 - 70 197 - 230
Alloyed Case Hardened Steel 50 - 60 164 - 197
Nitriding Steel 40 -50 131 - 164
Acid Resistant / Stainless Steel, 20 - 25 66 - 82
Stainless Steel Sulphured Austenitic Steel, Martensitic
High Tensile Steel Alloyed Heat Treatable Steel 40 - 50 131 - 164
Tool Steel 40 - 50 131- 164
High Speed Steel
Spring Steel 20 - 25 66 - 82
Cast Materials Cast Iron 70 - 80 230 - 263
Spheroidal Graphite & Malleable Ci 60 - 70 197 - 230
DRILLS Aluminum & Aluminum Alloys 150 - 180 492 - 590
32 - 49
Chilled Ci
10
Aluminum Alloys
Al Wrought Alloys
100 - 130
328 - 427
Al Cast Alloys < 10%si 150 - 180 492 - 590
Al Cast Alloys > 10%si 100 - 130 328 - 427
Special Alloys Special Alloys 15 - 18 49 - 60
Ti Alloys 15 - 20 49 - 65
Non Ferrous Metals Copper Low Alloyed 60 - 70 197 - 230
Brass 130 - 150 425 - 492
Bronze 100 - 110 328 - 360
Magnesium Alloys Mg Alloys 120 - 150 393 - 492

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