.: Cobra Carbide - Engineering Guide


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Solid Carbide Endmills

the material to cut
the desired shape of the machined part
the volume of material to be machined and other specific requirements .
Selection of end mill for the application on hand is dictated by many factors.Our product catalogue gives general guideline in the selction of endmills and the information given hereunder will serve as guideline.
Use largest diameter and shortest length end mill, the process can permit to get best results .
Ensure rigid setup of the work piece with emphasis on the best alignment between TOOL+TOOL HOLDER+MACHINE SPINDLE .
Use right speed and feed .
Use sharp tools and ensure copious continuous flow of coolant .

Speeds and Feeds

Speeds and Feeds for Solid Carbide Endmills
Meterial	Surface Speed - FT/Min	Feed per Tooth in 0.0001" Unit
Aluminium	600-1250	10-150
Aluminium Alloy	350-550	5-140
Brass	500-800	10-120
Bronze	400-600	10-120
Grey Cast Iron	500-700	10-80
Alloyed Cast Iron	250-500	5-75
Copper	700-900	15-100
Nickel Alloys	125-250	5-50
Low Carbon Steel	400-600	5-60
Medium Carbon Steel	200-400	5-50
Alloy Steel upto 45 HRC	150-250	4-40
Alloy Steel upto 50HRC	75-175	3-30
Alloy Steel upto 60HRC	50-100	2-20
Stainless Steel- Austenitic	200-300	2-40
Stainless Steel- Martensitic	300-400	3-60
Tool Steel	175-250	2-40
Titanium Alloys	100-200	2-50

The feed rate indicated cover sizes from 1/8" to 1". Apply minimum for smaller sizes and maximum for larger sizes.

For maximum endmill life,minimum tool wear,and heavy depth of cut use lower speed.
Higher speed can be adopted whereever light cuts,better surface finish and higher production rate is required * Coated end mills (TiN,TiCN,TiAlN) can be run at higher speed anf feed.

Lower feed rate is desirable when small and slender end mill is used.Slot milling and finishing cuts also need lighter feed rate.

Higher feed rate is adopted under following conditions. Use of roughing end mills, shortand coarse tooth end mills, component material with good machinabilty.

Solid Carbide Drills

Selection of Drills
Jobber length drill	Non ferrous alloys,plastics,highly abrasive materils,cast iron and Aluminium (not for use on steel)
Straight flute drill	Stainless steel,cryogenic alloys, Hardened,treated and abrasive Materials
Stub length drill(135 deg Pointangle)	High tempreture alloy steel,stainless Steels,inconel,cast iron,titanium Workhardening and gummy materials
NC Spotting & centering Drill	For making starting hole to enable the Drilling tools accurate location
Spade drill	Sheet metal drilling,spotting and Shallow holes

Feed Chart

Speed for Solid Carbide Drills
Meterial	Surface Speed FT/MIN
Aluminium	300-650
Aluminium Alloy	200-400
Bronze	200-300
Brass	150-250
Grey Cast Iron	250-450
Alloyed Cast Iron	150-250
Copper	200-300
Nickel Alloys	75-150
Low Carbon Steel	150-200
Medium Carbon Steel	100-200
Alloy Steel upto 45 HRC	75-125
Alloy Steel upto 50HRC	70-120
Alloy Steel upto 60HRC	50-100
Stainless Steel- Austenitic	75-100
Stainless Steel- Martensitic	100-150
Tool Steel	100-150
Titanium Alloys	50-150

Feed Rates for Drills(Inch/Rev)		Dia of Drills
MATERIAL	1/16"	1/8"	1/4"	1/2"
Aluminium	0.001	0.003	0.005	0.008
Aluminium	0.001	0.003	0.005	0.008
Brass	0.0005	0.002	0.004	0.006
Bronze	0.0005	0.002	0.004	0.006
Grey Cast Iron	0.0005	0.002	0.004	0.006
Alloyed Cast Iron	0.001	0.001	0.002	0.002
Copper	0.001	0.003	0.005	0.008
Nickel Alloys	0.001	0.002	0.004	0.006
Low Carbon Steel	0.001	0.002	0.004	0.006
Medium Carbon Steel	0.001	0.002	0.004	0.006
Alloy Steel upto 45 HRC	0.001	0.002	0.004	0.006
Alloy Steel upto 50HRC	0.001	0.002	0.004	0.006
Alloy Steel upto 60HRC	0.001	0.001	0.002	0.002
Stainless Steel- Austenitic	0.001	0.002	0.004	0.006
Stainless Steel- Martensitic	0.001	0.002	0.004	0.006
Tool Steel	0.001	0.002	0.004	0.006
Titanium Alloys	0.001	0.002	0.004	0.006

Solid Carbide Reamers

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