Speeds and Feeds - End Milling

Recommended End Milling Speeds and Feeds

Material Group	Speed (SFM)	Feed (Inch/Tooth) for each Diameter
Material Group	Speed (SFM)	1/8	1/4	1/2	3/4	1
Aluminum and Alloys	800-1300	0.0005	0.0020	0.0040	0.0060	0.0080
Brass/Bronze	250-400	0.0010	0.0020	0.0030	0.0040	0.0050
Copper and Alloys	400-800	0.0010	0.0020	0.0020	0.0040	0.0060
Cast Iron (Soft) 120-220- Bhn	250-600	0.0010	0.0020	0.0030	0.0060	0.0080
Cast Iron (Hard) 220-320 Bhn	100-300	0.0004	0.0008	0.0020	0.0030	0.0040
Ductile Iron	100-400	0.0005	0.0010	0.0030	0.0050	0.0070
Malleable Iron	250-400	0.0005	0.0010	0.0030	0.0050	0.0070
Magnesium and Alloys	1000- 1500	0.0010	0.0020	0.0040	0.0060	0.0100
Hi-Temp. Alloys - Nickel Base	25-100	0.0004	0.0008	0.0010	0.0010	0.0020
Monel - High Nickel Steels	200-250	0.0005	0.0010	0.0020	0.0030	0.0040
Plastics - Glass Filled	350-600	0.0015	0.0030	0.0040	0.0060	0.0120
Plastics	800-1600	0.0005	0.0030	0.0060	0.0100	0.0150
Low Carbon Steels Annealed	250-400	0.0005	0.0010	0.0030	0.0050	0.0070
Medium Carbon Steels 275-425 Bhn	125-300	0.0006	0.0015	0.0020	0.0040	0.0050
Hardened Steels 48-52 Rc ``C"	30-100	0.0002	0.0005	0.0010	0.0020	0.0030
Stainless Steels Soft	200-400	0.0005	0.0010	0.0020	0.0040	0.0060
Stainless Steels Hard	60-250	0.0002	0.0005	0.0010	0.0030	0.0050
Titanium (Soft)	150-400	0.0005	0.0010	0.0020	0.0040	0.0080
Titanium (Hard)	50-200	0.0003	0.0005	0.0010	0.0020	0.0040
Refractory Alloys	100-300	0.0005	0.0010	0.0010	0.0015	0.0020

General Machining Guidelines

1. The higher values for surface speed should be used on lighter radial depths of cut; the lower values for greater depths of cut.

2. The above recommendations are for width of cuts or axial lengths of cuts not too exceed 1-1/2 times the cutter diameter.

3. Reduce speeds approximately 20% of lowest value for slotting applications.

Useful Formulas for End Milling

Cutting Speed   Vc = .262 x D1 x rpm
Revolutions / Min.   rpm=3.82 x Vc / D1
Feed Rate   fm = ft x n x rpm
Feed Rate / Tooth   ft = fm / (n x rpm)
Symbols Used:

D1 = End Mill Diameter
rpm = Revolutions per Minute
Vc = Cutting Speed, feet per Minute
ft = Feed, Inches / Tooth
fm = Feed, Inches / Revolution
n = number of teeth


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