.: Cobra Carbide - Technical Info


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Engineering Guide

Technical Info

Coatings

Decimal Equivalent

ENDMILL OPERATING DATA

Endmill Selection

1	The more flutes on the Endmill will usually improve the surface finish of a part. If workpiece finish is important, select four or more flutes.
2	Fewer flutes permit greater chip carrying capacity.
3	Always select the largest diameter Endmill for the cut being made. This helps to keep tool deflection to a minimum and reduces chip load.
4	Keep tool overhang to a minimum, always insert the shank as far as possible into the holder. Collet holders are preferred set up.

Endmill Speeds and feeds.

1	Proper speeds and feeds will help eliminate chatter and excessive heating of the tool.
2	Refer to the chart below for suggested speeds and feeds for various materials.
3	Speed ranges are dependent on the machinability of the material.
4	For slotting applications the speed of the cutter should be reduced 20-30%.
5	Long flute length tools reduce the feed per tooth 50% and speed 20%
6	Roughing endmills should increase feed per tooth 50%-100%
7	Depths of cut are not to exceed 1-1/2 times the cutter diameter.
8	As radial and axial depth of cut increase, chip load should decrease.

MATERIAL	SPEED SFM	1/8	1/4	3/8	1/2	3/4	1	COATING 1ST CHOICE	APPLICATION 2ND CHOICE
Non-Ferrous Materials
Aluminium / Aluminium Alloys	800-2000	0.0005	0.002	0.003	0.004	0.006	0.008	TiCN
Brass / Soft Bronze	300-900	0.001	0.002	0.003	0.004	0.004	0.005	TiCN
Copper / Copper Alloys	600-1000	0.001	0.002	0.0025	0.003	0.004	0.005	TiCN
Magnesium / Magnesium Alloys	1000(min)	0.001	0.002	0.003	0.004	0.006	0.01	TiCN
Plastics	600-1100	0.0015	0.003	0.004	0.006	0.01	0.15	TiCN
Plastics Glass Filled (Acrylics, Phenolics)	350-600	0.0015	0.003	0.0035	0.004	0.06	0.12	TiCN
Cast Iron
Ductile Iron	100-400	0.0005	0.001	0.0015	0.002	0.004	0.006	TiAlN	TiCN
Gray Cast Iron	450-600	0.001	0.002	0.003	0.004	0.005	0.006	TiAlN	TiCN
Malleable Cast iron	150-500	0.0005	0.001	0.002	0.003	0.005	0.007	TiAlN	TiCN
Hight Temperature Alloys
Nickel Base	45-125	0.0004	0.0008	0.001	0.001	0.001	0.002	TiAlN	TiCN
Monel / High Nickel Steel	60-150	0.0005	0.001	0.0015	0.002	0.003	0.004	TiAlN	TiCN
Stainless Steel
Austenitic (300 Series)	100-350	0.0003	0.001	0.001	0.001	0.0025	0.004	TiCN	TiN
Martensitic (400 Series)	80-200	0.0002	0.0005	0.0006	0.0007	0.0015	0.003	TiCN	TiCN
Steels
Low Carbon (10xx, 11xx, 13xx)	250-500	0.0005	0.00015	0.002	0.003	0.005	0.006	TiCN	TiN
Medium Carbon (200, 250, 300)	125-400	0.0005	0.001	0.0015	0.00025	0.004	0.005	TiCN	TiN
High Strength Steels (4340, 6150, H-11, H-13)	50-200	0.0002	0.0005	0.001	0.001	0.002	0.003	TiCN	TiN
Titanium Alloys
Titanium Alloys(Soft)	90-130	0.0005	0.0005	0.0015	0.002	0.003	0.004	TiAlN	TiCN
Titanium Alloys (Hard)	50-170	0.0003	0.0003	0.001	0.0015	0.002	0.003	TiAlN	TiCN
Note: These are suggested starting ponts only. Use low end recommendations to start and adjust your SFM by chip color. Chips should be tan, if while increased your speed. If blue and dark, lower your speed. Light cuts at higher speed will improve the surface finish.

DRILLS OPERATING DATA

Drill Selection

1	Carbide Drills with their wide variety of styles cabe used ivarious applications from soft non-ferrous materials to hardened steels.
2	The wear resistance of carbide makes it the ideal choice for use iabrasive materials. Always use the shortest drill to complete the job.
3	The use of combined drills and countersinks to start holes for carbide drills is not recommended.
4	Drills should be resharpened as sooas the point becomes dull. If there is a change ithe chip color or shape check your point.
5	If coolant is used extreme care must be exercised to avoid any suddecooling of the heated tip, which may cause cracking of the tip.

Drill Speeds and feeds.

1	Carbide Drills should be run at 2-2-1/2 times the speed rate of hight speed steel drills.
2	Feed rates are similar to high speed steel drills, but a slightly lower feed with the higher speed gives best results.
3	Deep hole drilling may require reduced feed rates.

Drill Speed and feed Recommendation.

		Speed Per Evolution
		Drill Diameter
Meterial	Speed MPM	3 MM	6 MM	12 MM
Non Ferrous material
Aluminium/ Aluminium alloys	75 - 180	0.07	0.18	0.3
Brass	75	0.05	0.07	0.1
Bronze	40	0.05	0.07	0.1
Copper/Copper alloys	40 - 75	0.07	0.15	0.25
Magnesium/Magnesium alloys	80 - 150	0.07	0.18	0.3

Plastics	40 - 120	0.05	0.1	0.12

Cast iron
Ductile	60 - 80	0.07	0.15	0.3
Grey cast iron	40 - 75	0.05	0.1	0.18
Malleable cast iron	25 - 60	0.05	0.1	0.18

High Temperature alloys
Monel/High Nickel steel	20 - 40	0.07	0.12	0.22

Stainless Steel
Austenitic (300 series)	25 - 80	0.07	0.12	0.2
Martensitic (400 series)	15 - 30	0.05	0.1	0.15

Steel
Medium carbon	25 - 50	0.05	0.1	0.18
Tools steel	15 - 30	0.05	0.07	0.15
High tensile (40- 45 Rc)	60	0.05	0.07	0.07
High tensile (45 - 50 Rc)	25	0.02	0.03	0.03

Titanium	25 - 100	0.05	0.1	0.15

REAMERS OPERATING DATA

Reamer Selection

1	Solid Carbide Reamers can be used in a wide variety of both ferrous and non-ferrous materials.
2	In hardened material over Rc40, solid carbide reamers are the only logical choice.
3	It is extremely important that you have a rigid set-up. Chatter cannot be permitted.
4	It is important to leave the proper amount of stock for effective reaming. If the hole is too close to the finish size you will end up burnishing the hole.

Reamer Speeds and feeds.

1	Work piece hardness is the most important factor in determining carbide speeds.
2	Reduce your speed if chatter is evident.
3	If reduced speed does not eliminate chatter, a higher feed should be tried.
4	As diameter increases, feed rates can be increased.

Reamer Diameter	Suggested Stock Removal
Up to 1/16"	0.003 to 0.005"
1/16" to 1/8"	0.004 to 0.008"
1/8" to 1/4"	0.008 to 0.014"
1/4" to 3/8"	0.008 to 0.014"
3/8" to 1/2"	0.010 to 0.015"
1/2" to 5/8"	0.012 to 0.018"

Material	Speed (SFM)	Feed (IPR)
Cast and Malleable Iron	50-85	.005"-0.012"
Non Ferrous Metals	90-175	0.005" - 0.012"
Steel Rc 20 and under	60-90	0.005" - 0.010"
Steel Rc 30 to 40	35-65	0.004" - 0.010"
Steel Rc 40 to 50	20-40	0.003" - 0.006"
Steel Rc 50 to 60	15-30	0.002" - 0.004"
Steel Rc 60 or higher	8-20	0.001" - 0.003"

BURRS OPERATING DATA

Burr Selection

1	Most deburring operations are done by hand. To maintain maximum spindle speed the operator must limit the amount of pressure on the work piece.
2	Keep the burr moving at all times so that it will not dig into the work piece.
3	Do not allow the steel shank on the burr to engage the work piece. This could cause the tool to overheat and weaken the braze joint.

Burr Speeds and feeds.

1	Carbide Burrs should operate between 1500 and 3000 surface feet per minute.
2	Solid Carbide Burrs 1/8" and smaller may be run up to 75,000 RPM depending on material.
3	3/16"-3/8" can be used on a 30,000 RPM die grinder.
4	1/4"-1/2" will run satisfactorily on a 22,000 RPM die grinder.
5	Generally, higher speeds will reduce stock removal but will improve surface finish while slowwer speeds will increase stock removal but lower finish.
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Uncoated Tools
1	Operate at higher speeds and provide excellent wear over HSS and cobalt Endmills.
2	Offer an economical Solution to many of your machining needs.
TiN Coating
1	TiN coating provide excellent results in Iron base applications
2	Increases speed rate(SFM) 20% over parameters uncoated.
TiCN Coating
1	Multi Layer coating TiCN coating is tougher and harder than Tin Coating.
2	Higher hardness makes TiCN a good choice for abrasive applications.
3	Increases speed rate(SFM) 40% over uncoated tool parameters.
TiAIN Coating
1	Designed to run at even higher temperatures than the TiCN coating.
2	Produces good results in Stainless Steel, nickel based alloys, high temperature, and titanium alloys.
3	Coating allows for high speed semi-dry or dry machining operations.
4	Increases speed rate(SFM) 50% over parameters uncoated tool parameters.

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