2. Va r i a b l e H e l i x E n d M i l l s
Viper EndMills helps in avoiding resonance which is detrimental to the surface
finish and tool life. The tool geometry helps in achieving higher
Material Removal Rate (MRR)
Features Work Material
- Manufacture from premium sub micron grain carbide.
- Effective for profiling & side milling application. Alloy Stainless Nickel / Carbon Hardened
Steel Steel Inconel Alloy Steel Steel
- Increased feed rate with 5 flute endmill.
Excellent Good
- Increased stability during cutting.
Benefits
- Reduced chatter & vibration
during machining. Cut Dia
- Can be used at higher parameters. tolerance
- Increased productivity. h10
- Better surface finish on the machined surface.
Applications
Helix angle changes
along the flute
320-380
Special flute form
for easy chip flow
CG Coating
for extended tool life
Coating Details
Micro Hardness
(HV0.05) 3200
Coefficient Of Friction 0.35
Against Steel
Maximum Service 1100 Shank dia tolerance
h6
Temperature 0c
Coating Colour Blue Grey
Features High Oxidation Resistance
Hot Hardness
High Wear Resistance
3. Va r i a b l e H e l i x E n d M i l l s
Overall Length
Length Of Cut
Cut Dia Shank Dia
4 & 5 Flute R Shank
Upto 35
320- Design
HRC
380 HA
4 Flute - Regular Length
Description CG Coated - EDP #
Cut Shank Length Overall Corner
Dia Dia Of Cut Length Radius 4 Flute
4 4 14 51 0.4 19880
6 6 20 63 0.4 19882
8 8 20 63 0.4 19884
10 10 25 70 0.4 19886
12 12 25 76 0.6 19888
16 16 32 89 0.7 19890
20 20 38 100 0.7 19901
25 25 38 100 0.7 19903
5 Flute - Regular Length
Description CG Coated - EDP #
Cut Shank Length Overall Corner
Dia Dia Of Cut Length Radius 5 Flute
4 4 14 51 0.4 19891
6 6 20 63 0.4 19892
8 8 20 63 0.4 19894
10 10 25 70 0.4 19896
12 12 25 76 0.6 19898
16 16 32 89 0.7 19899
20 20 38 100 0.7 19904
25 25 38 100 0.7 19906
call : 90084 90480 | eMail: atg@cobracarbide.com
4. Krait
High Feed EndMills
These are high feed endmills which help reduce production time & improve
productivity. These endmills are suitable for broad range of work materials.
Features Work Material
- Manufactured from premium
sub micron grain carbide. Alloy Stainless Cast Nickel / Carbon
Steel Steel Iron Inconel Alloy Steel
- 4 Flute Centre Cutting Mill Utilizes the optimal
Excellent Good
Helix angle, more Web thickness &
Spherical Flute geometry.
Benefits
- Can be used at high feed rate due to rigid geometry.
- Suitable for roughing & finishing of wide range
of materials.
- Increased productivity.
Cut Dia tolerance
Applications h10
More web thickness for
added strength
Better chip evacuation
due to special flute
CG Coating for
extended tool life Helix 400
Coating Details
Micro Hardness(HV0.05) 3200 Stuby flute for
Coefficient Of Friction 0.35 tool rigidity
Against Steel
Maximum Service 1100
Temperature 0c Shank dia tolerance
h6
Coating Colour Blue Grey
Features High Oxidation Resistance
Hot Hardness
High Wear Resistance
5. Krait
High Feed EndMills
Overall Length
Length Of Cut
Cut Dia Shank Dia
4 Flute Square End Shank
<40
400 Design
HRC
4 Flute - Regular Length HA
Description CG Coated - EDP #
Cut Shank Length Overall
Dia Dia Of Cut Length 4 Flute
6 6 19 63 16190
8 8 20 63 16192
10 10 22 75 16194
12 12 25 75 16196
16 16 32 89 16198
20 20 38 100 16200
25 25 38 100 16202
call : 90084 90480 | eMail: atg@cobracarbide.com
6. Aluma EndMills
Special gemoetry with corner radius provides additional strength & polished flute
allows easy chip flow. 2 Flute aluma endmills are used for roughing and
3 flute aluma for finishing applications.
Cut Dia tolerance
Features h10
- Special ultra fine grade for
machining Aluminium.
- High feed roughing with
excellent chip evacuation.
Advance tool geometry
- Excellent for slotting and profiling
for maximum material removal
at high speeds.
Work Material
Aluminium Cast
Alloy Iron
Excellent Good
Highly polished flute for
Benefits
easy chip flow
- Suitable for roughing & finishing
applications.
- Can be used at high parameters.
- 2 flute for roughing application.
- 3 Flute for finishing application.
- Suitable for slotting & profile milling.
Applications
Shank dia tolerance
h6
8. Die & Mould
EndMills
Suitable for machining complex contours in mould upto 65HRC. Flat and radius
endmills are used for roughing and ball nose endmills are used
for finishing applications.
Features
- Centre cutting geometry +/- 8 microns tolerance
- Manufactured from premium on ball radius
sub micron grain carbide.
Cut Dia tolerance
h8
Work Material
Alloy Stainless Hardened Carbon Nickel / Titanium Special geometry for
Steel Steel Steel Steel Inconel
Alloy Die & Mold application
Excellent Good
Shorter flute length for
Benefits max rigidity
- Suitable for Die & Mold application upto 65 HRC.
- Excellent surface finish & accuracy.
- Also available in 4 flute Ball nose,
4 Flute Corner radius & 4 flute flat endmill. Shank dia tolerance
h6
CG
Alcrona Aldura
Coating Details TiAlN (AlCrN) (AlCrN)
Micro Hardness 3300 3200 3300
(HV0.05)
Coefficient Of Friction 0.302-0.035 0.35 0.35-0.4
Against Steel
Maximum Service 900 1100 >1100
Temperature 0c
Coating Colour Violet Grey Blue Grey Blue Grey
Features Increased Cutting High Oxidation Improved Tool Edge Stability
Stability Resistance Oxidation Resistance
Protection Hot Hardness High Thermal Resistance
Against Abrasive High Wear
Wear & Erosion Resistance
11. Speeds Performance EndMills
High
& Feeds
Cutting Speed (Vc - m/min)
Material Material Die & Mould
Group Type Viper Krait Aluma Ball Nose Square
Steel Structural Steel 100-136 85-110
Free Cutting Steel 80-136 60-100
Unalloyed Heat Treatable Steel 80-130 60-100
Unalloyed Case Hardened Steel 120-150 100-130 50-70 80-100
Alloyed Case Hardened Steel 75-120 65-100 40-60 70-90
Nitriding Steel 100-136 75-115
Acid Resistant / Stainless Steel, 75-100 60-100 50-60 55-65
stainless Steel Sulphured Austenitic Steel,
High Tensile Steel Low Carbon Steel 90-100 80-100
Medium Carbon Steel 60-80 80-90
Alloyed Heat Treatable Steel 80-120 60-100 60-80 70-90
Tool Steel 80-120 60-100
High Speed Steel 60-75 50-65
Cast Materials Cast Iron 130-175 110-150
Spheroidal Graphite & 100-150 60-120
Malleable Ci
Chilled Ci 70-85 60-70
Aluminium & Aluminium & Ti Alloys 300-375
Aluminium Alloys Al Wrought Alloys 350-440
Al Cast Alloys < 10%si 100-180
Al Cast Alloys > 10%si 100-180
Special Alloys Special Alloys 50-60 50-60 30-40
Ti & Ti Alloys 50-75 60-100 60-70 40-60
Non ferrous Metals Copper Low Alloyed 80-120
Brass 65-95
Bronze 65-95
Plastics Duro Plastics 75-110
Thermoplastics 75-110
Magnesium Alloys Mg Alloys 175-225
Hardened Steel 70-120 60-90
(45-65HRC)
call : 90084 90480 | eMail: atg@cobracarbide.com
12. Speeds Performance EndMills
High
& Feeds
General Purpose & High Performance EndMills
Feed (mm/tooth)
Diameter
Material 2 3 5 6 8 10 12 20 25
Steel 0.014 0.017 0.025 0.03 0.045 0.055 0.07 0.09 0.13
High Tensile Steels 0.01 0.013 0.018 0.022 0.03 0.038 0.052 0.06 0.1
Acid Resistant 0.018 0.022 0.035 0.045 0.06 0.075 0.095 0.13 0.15
Cast Material 0.014 0.017 0.025 0.03 0.045 0.055 0.07 0.09 0.13
Aluminium Alloys 0.036 0.044 0.07 0.09 0.12 0.15 0.19 0.26 0.3
Titanium Alloys 0.018 0.022 0.035 0.045 0.06 0.075 0.095 0.13 0.15
Non Ferrous 0.036 0.044 0.07 0.09 0.12 0.15 0.19 0.26 0.3
Plastic 0.006 0.01 0.02 0.025 0.032 0.039 0.048 0.058 0.073
Mg Alloys 0.036 0.044 0.07 0.09 0.12 0.15 0.19 0.26 0.3
Endmill Selection
- The more flutes on the endmill will usually improve the surface finish of the part.
If work piece finish is important, select four or more flutes.
- Fewer flutes permit greater chip carrying capacity
- Always select the largest diameter end mill for the cut being made.
This helps to keep deflection to a minimum and decreases the chip load.
- Keep tool overhang to a minimum, always insert the shank as far as possible into the holder.
Collet holders are preferred set up.
Speeds and Feeds
- Proper speeds and feeds will help eliminate chatter and excessive heating of the tool,
- Refer to the chart above for suggested speeds and feeds for various materials
- Speed ranges are dependent on the machinablility of the material
- For slotting applications the speed of the cutter should be reduced 20-30%
- Long flute length tools reduce the feed per tooth 50% and speed 20%
- Roughing end mills should increase feed per tooth 50%-100%
- Depths of cut are not to exceed 1-1/2 times the cutter diameter.
Cobra Carbide Pvt. Ltd.
54, Bommasandra Jigani Link Road,
Industrial Area Phase IV, Bangalore - 560 105.
Phone: +91-8110-4150 03-06 Fax: 4150 07 Mobile: 90084 90480
eMail: atg@cobracarbide.com website: www.cobra-india.com
