Speeds and Feeds - Drilling

Recommended Drilling Speeds and Feeds

Material Group	Rec. Drill Sizes	Speed (RPM)	Feed Range (Inch/Revolution) for each Drill Diameter
Material Group	Rec. Drill Sizes	Speed (RPM)	1/16	1/8	1/4	1/2	3/4	1
Aluminum and Alloys	225	150-400	0.0010	0.0020	0.0030	0.0050
	240		0.0020	0.0040	0.0070	0.0130
	223
Brass/Bronze	225	100-300	0.0005	0.0010	0.0020	0.0040
	235		0.0015	0.0030	0.0040	0.0100
	240
Copper and Alloys	225	150-400	0.0010	0.0030	0.0050	0.0060
	240		0.0030	0.0050	0.0120	0.0140
	223
Cast Iron (Soft) 120-220 Bhp	225	100-300	0.0010	0.0020	0.0040	0.0050	0.0070	0.0090
	235		0.0020	0.0040	0.0080	0.0100	0.0120	0.0140
	240
	223
Cast Iron (Hard) 220-320- Bhp	235	60-200	0.0015	0.0010	0.0020	0.0030	0.0040	0.0050
	240		0.0020	0.0030	0.0040	0.0070	0.0080	0.0100
	245
Ductile Iron	235	70-250	0.0010	0.0020	0.0030	0.0050	0.0060	0.0070
Ductile Iron	240	70-250	0.0020	0.0040	0.0060	0.0080	0.0090	0.0150
Malleable Iron	235	70-250	0.0010	0.0020	0.0030	0.0050	0.0060	0.0070
Malleable Iron	240	70-250	0.0020	0.0040	0.0060	0.0080	0.0090	0.0150
Magnesium and Magnesium Alloys	225	200-650	0.0015	0.0030	0.0050	0.0080
Magnesium and Magnesium Alloys	240	200-650	0.0030	0.0070	0.0120	0.0150
Hi-Temp. Alloys - Nickel Base	235	30-90	0.0005	0.0005	0.0010	0.0015	0.0020	0.0025
	240		0.0010	0.0030	0.0040	0.0050	0.0060	0.0070
	245
Monel - Nickel Alloys	235	30-90	0.0005	0.0005	0.0010	0.0015	0.0020	0.0025
	240		0.0010	0.0020	0.0030	0.0040	0.0050	0.0060
	245
Plastics - Glass Filled	225	150-300	0.0010	0.0020	0.0030	0.0050
	240		0.0020	0.0040	0.0060	0.0120
	223
Plastics	225	250-600	0.0015	0.0030	0.0040	0.0060
	240		0.0030	0.0050	0.0120	0.0160
	223
Low Grade Carbon Steels - Annealed	235	85-150	0.0005	0.0010	0.0020	0.0040	0.0050	0.0060
	240		0.0015	0.0030	0.0050	0.0090	0.0100	0.0120
	223
Medium Grade Carbon Steel 275-425 Bhn	235	85-150	0.0005	0.0010	0.0020	0.0030	0.0040	0.0040
Medium Grade Carbon Steel 275-425 Bhn	240	85-150	0.0010	0.0020	0.0040	0.0080	0.0090	0.0100
Hardened Steels 48-52 Rc ``C"	235	30-90	0.005	0.0010	0.0020	0.0030	0.0040	0.0040
	240		0.0010	0.0030	0.0030	0.0050	0.0060	0.0070
	245
Stainless Steel Soft 135-275 Bhn	235	50-150	0.0005	0.0005	0.0020	0.0040	0.0050	0.0060
	240		0.0010	0.0030	0.0060	0.0060	0.0080	0.0100
	245
	223
Stainless Steel Hard 275-425 Bhn	235	30-90	0.0005	0.0005	0.0010	0.0015	0.0020	0.0025
	240		0.0010	0.0020	0.0030	0.0040	0.0060	0.0070
	245
Titanium (Soft)	235	60-200	0.0005	0.0020	0.0040	0.0050	0.0060	0.0070
	240		0.0010	0.0040	0.0070	0.0090	0.0100	0.0120
	245
Titanium (Hard)	235	45-200	0.0005	0.0010	0.0020	0.0040	0.0040	0.0050
	240		0.0010	0.0030	0.0050	0.0090	0.0100	0.0110
	245
Refractory Metals	235	50-200	0.0005	0.0005	0.0020	0.0040	0.0050	0.0050
Refractory Metals	240	50-200	0.0010	0.0030	0.0060	0.0100	0.0120	0.0120

General Machining Guidelines

1. Higher feed and speed values should be favored for softer materials; lower feed and speed values should be used on harder materials.

2. The above recommendations are for hole depths up to two drill diameters. When hole depth runs 3 - 6 diameters, speeds should be reduced 10% - 35% respectively, and feeds should re reduced 10%-20% respectively.

Useful Formulas for Drilling

Cutting Speed (sfm)    Vc = .262 x D1 x rpm
Revolutions / Minute   rpm = 3.82 c Vc / D1
Feed Rate (fpm)   fm = fr x rpm
Feed Rate / Revolution (fpr)    fr = fm / rpm
Symbols Used:

D1 = Drill diameter, inches
rpm = Revolutions per minute
Vc = Cutting speed, feet / minute
fr = Feed, inches / revolution
fm = Feed, Incles / minute


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