Feeds and Speeds

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Uncoated Carbide (safe speed for any carbide)

Feeds are inches / mm per tooth.

Material Speed SFM SMM 1/8 3mm 3/16 5mm 1/4 6mm 5/16 8mm 3/8 10mm 1/2 12mm 5/8 16mm 3/4 20mm 1" 25mm
Aluminum 500 150 .0011 .028 .0017 .043 .0022 .056 .0027 .068 .0032 .081 .0042 .107 .0065 .165 .0085 .216 .0092 .234
Brass Bronze 400 120 .0011 .028 .0017 .043 .0022 .056 .0027 .068 .0032 .081 .0042 .107 .0065 .165 .0085 .216 .0092 .234
Mild Steel 250 75 .0006 .16 .0011 .028 .0017 .043 .002 .051 .0025 .064 .0028 .071 .0032 .081 .0033 .084 .0041 .104

grumble

<tbody> </tbody>
End Mill Speeds And Feeds Chart - AlTiN Coated Carbide

SMM = SFM X .3048

 

Speeds

Feeds - IPT (inches/tooth) and MMPT (mm/tooth)

Material

Group

Examples

SFM

1/8"

3mm

3/16"

5mm

1/4"

6mm

5/16"

8mm

3/8"

10mm

1/2"

12mm

5/8"

16mm

3/4"

20mm

1"

25mm

 

Steels P

Mild - 1018

(.2-.3 Carbon)

500

 

.0006"

.016mm

 

.0011"

.028mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.0028"

.071mm

 

.0032"

.081mm

 

.0033"

.084mm

 

.0041"

.104mm

Mild - 4140

(.4-.5 Carbon)

350

Tool Steels

A2/D2/H13/P20

280

 

.0004"

.010mm

 

.0009"

.023mm

 

.0013"

.033mm

 

.0016"

.041mm

 

.0019"

.048mm

 

.0021"

.053mm

 

.0026"

.066mm

 

.0028"

.071mm

 

.0028"

.071mm

Forgings

180

 

Cast

Irons

K

Soft

600

 

.0006"

.016mm

 

.0011"

.028mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.0028"

.071mm

 

.0032"

.081mm

 

.0033"

.084mm

 

.0041"

.104mm

Medium

400

Hard Chilled

350

Malleable

300

 

Stainless Steels

M

Free Machining

350

.0006"

.016mm

.0011"

.028mm

.0017"

.043mm

.002"

.051mm

.0025"

.064mm

.0028"

.071mm

.0032"

.081mm

.0033"

.084mm

.0041"

.104mm

Ferritic

280

Austenitic

304/316

250

 

.0004"

.010mm

 

.0009"

.023mm

 

.0013"

.033mm

 

.0016"

.041mm

 

.0019"

.048mm

 

.0021"

.053mm

 

.0026"

.066mm

 

.0028"

.071mm

 

.0028"

.071mm

Martensitic

210

PH

17-4 PH

160

 

Special Alloys S

Titanium

6AL-V4

240

.0003"

.008mm

.0005"

.013mm

.0007"

.018mm

.001"

.025mm

.0012"

.030mm

.0014"

.036mm

.0017"

.043mm

.0019"

.048mm

.0025"

.063mm

Co-Based Alloys

Stellite

140

 

.0004"

.010mm

 

.001"

.025mm

 

.0012"

.030mm

 

.0015"

.038mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.003"

.076mm

 

.003"

.076mm

Ni-Based Alloys

Inconel 625/718

140

Fe-Based Alloys

Incoloy 800-802

160

Hardened

Steels H

35-45Rc

270

.0004"

.010mm

.001"

.025mm

.0012"

.030mm

.0015"

.038mm

.0017"

.043mm

.002"

.051mm

.0025"

.064mm

.003"

.076mm

.003"

.076mm

45-55Rc

200

55-65Rc

70

Non- Ferrous N

Al/Al Alloys

650

 

.0011"

.028mm

 

.0017"

.043mm

 

.0022"

.056mm

 

.0027"

.068mm

 

.0032"

.081mm

 

.0042"

.107mm

 

.0065"

.165mm

 

.0085"

.216mm

 

.0092"

.234mm

Brass/Bronze

550

Mg/Mg Alloys

950

Plastics/Bakelite

1000

Formulas

Speeds - Inch

SFM = surface feet per minute

RPM = SFM X 3.82 / Tool Diameter

Speeds - Metric

SMM = surface meters per minute

RPM = SMM X 318.06 / Tool Diameter

Radial Depth of Cut in Percentage of Diameter

50%

30%

20%

15%

10%

5%

1%

CLF = chip load factor

1.0

1.1

1.2

1.4

1.8

2.3

5.0

Feeds - Inch

IPM = inches per minute IPT = inches / tooth

IPM = RPM X number of teeth X CLF X IPT

 

Feeds - Metric

MMPM = mm per minute MMPT = mm / tooth

MMPM = RPM X number of teeth X CLF X MMPT
<tbody> </tbody>
End Mill Speeds And Feeds - TiN Coated Carbide

SMM = SFM X .3048

 

Speeds

Feeds - IPT (inches/tooth) and MMPT (mm/tooth)

Material

Group

Examples

SFM

1/8"

3mm

3/16"

5mm

1/4"

6mm

5/16"

8mm

3/8"

10mm

1/2"

12mm

5/8"

16mm

3/4"

20mm

1"

25mm

 

Steels P

Mild - 1018

(.2-.3 Carbon)

420

 

.0006"

.016mm

 

.0011"

.028mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.0028"

.071mm

 

.0032"

.081mm

 

.0033"

.084mm

 

.0041"

.104mm

Mild - 4140

(.4-.5 Carbon)

300

Tool Steels

A2/D2/H13/P20

240

 

.0004"

.010mm

 

.0009"

.023mm

 

.0013"

.033mm

 

.0016"

.041mm

 

.0019"

.048mm

 

.0021"

.053mm

 

.0026"

.066mm

 

.0028"

.071mm

 

.0028"

.071mm

Forgings

150

 

Cast

Irons

K

Soft

540

 

.0006"

.016mm

 

.0011"

.028mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.0028"

.071mm

 

.0032"

.081mm

 

.0033"

.084mm

 

.0041"

.104mm

Medium

360

Hard Chilled

300

Malleable

270

 

Stainless Steels

M

Free Machining

360

.0006"

.016mm

.0011"

.028mm

.0017"

.043mm

.002"

.051mm

.0025"

.064mm

.0028"

.071mm

.0032"

.081mm

.0033"

.084mm

.0041"

.104mm

Ferritic

240

Austenitic

304/316

220

 

.0004"

.010mm

 

.0009"

.023mm

 

.0013"

.033mm

 

.0016"

.041mm

 

.0019"

.048mm

 

.0021"

.053mm

 

.0026"

.066mm

 

.0028"

.071mm

 

.0028"

.071mm

Martensitic

180

PH

17-4 PH

150

 

Special Alloys S

Titanium

6AL-V4

210

.0003"

.008mm

.0005"

.013mm

.0007"

.018mm

.001"

.025mm

.0012"

.030mm

.0014"

.036mm

.0017"

.043mm

.0019"

.048mm

.0025"

.063mm

Co-Based Alloys

Stellite

120

 

.0004"

.010mm

 

.001"

.025mm

 

.0012"

.030mm

 

.0015"

.038mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.003"

.076mm

 

.003"

.076mm

Ni-Based Alloys

Inconel 625/718

120

Fe-Based Alloys

Incoloy 800-802

150

Hardened

Steels H

35-45Rc

240

.0004"

.010mm

.001"

.025mm

.0012"

.030mm

.0015"

.038mm

.0017"

.043mm

.002"

.051mm

.0025"

.064mm

.003"

.076mm

.003"

.076mm

45-55Rc

180

55-65Rc

60

Non- Ferrous N

Al/Al Alloys

600

 

.0011"

.028mm

 

.0017"

.043mm

 

.0022"

.056mm

 

.0027"

.068mm

 

.0032"

.081mm

 

.0042"

.107mm

 

.0065"

.165mm

 

.0085"

.216mm

 

.0092"

.234mm

Brass/Bronze

480

Mg/Mg Alloys

840

Plastics/Bakelite

960

Formulas

Speeds - Inch

SFM = surface feet per minute

RPM = SFM X 3.82 / Tool Diameter

Speeds - Metric

SMM = surface meters per minute

RPM = SMM X 318.06 / Tool Diameter

Radial Depth of Cut in Percentage of Diameter

50%

30%

20%

15%

10%

5%

1%

CLF = chip load factor

1.0

1.1

1.2

1.4

1.8

2.3

5.0

Feeds - Inch

IPM = inches per minute IPT = inches / tooth

IPM = RPM X number of teeth X CLF X IPT

 

Feeds - Metric

MMPM = mm per minute MMPT = mm / tooth

MMPM = RPM X number of teeth X CLF X MMPT

Uncoated Carbide

<tbody> </tbody>

SMM = SFM X .3048

 

Speeds

Feeds - IPT (inches/tooth) and MMPT (mm/tooth)

Material

Group

Examples

SFM

1/8"

3mm

3/16"

5mm

1/4"

6mm

5/16"

8mm

3/8"

10mm

1/2"

12mm

5/8"

16mm

3/4"

20mm

1"

25mm

 

Steels P

Mild - 1018

(.2-.3 Carbon)

350

 

.0006"

.016mm

 

.0011"

.028mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.0028"

.071mm

 

.0032"

.081mm

 

.0033"

.084mm

 

.0041"

.104mm

Mild - 4140

(.4-.5 Carbon)

250

Tool Steels

A2/D2/H13/P20

200

 

.0004"

.010mm

 

.0009"

.023mm

 

.0013"

.033mm

 

.0016"

.041mm

 

.0019"

.048mm

 

.0021"

.053mm

 

.0026"

.066mm

 

.0028"

.071mm

 

.0028"

.071mm

Forgings

125

 

Cast

Irons

K

Soft

450

 

.0006"

.016mm

 

.0011"

.028mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.0028"

.071mm

 

.0032"

.081mm

 

.0033"

.084mm

 

.0041"

.104mm

Medium

300

Hard Chilled

250

Malleable

225

 

Stainless Steels

M

Free Machining

300

.0006"

.016mm

.0011"

.028mm

.0017"

.043mm

.002"

.051mm

.0025"

.064mm

.0028"

.071mm

.0032"

.081mm

.0033"

.084mm

.0041"

.104mm

Ferritic

200

Austenitic

304/316

180

 

.0004"

.010mm

 

.0009"

.023mm

 

.0013"

.033mm

 

.0016"

.041mm

 

.0019"

.048mm

 

.0021"

.053mm

 

.0026"

.066mm

 

.0028"

.071mm

 

.0028"

.071mm

Martensitic

150

PH

17-4 PH

125

 

Special Alloys S

Titanium

6AL-V4

175

.0003"

.008mm

.0005"

.013mm

.0007"

.018mm

.001"

.025mm

.0012"

.030mm

.0014"

.036mm

.0017"

.043mm

.0019"

.048mm

.0025"

.063mm

Co-Based Alloys

Stellite

100

 

.0004"

.010mm

 

.001"

.025mm

 

.0012"

.030mm

 

.0015"

.038mm

 

.0017"

.043mm

 

.002"

.051mm

 

.0025"

.064mm

 

.003"

.076mm

 

.003"

.076mm

Ni-Based Alloys

Inconel 625/718

100

Fe-Based Alloys

Incoloy 800-802

125

Hardened

Steels H

35-45Rc

200

.0004"

.010mm

.001"

.025mm

.0012"

.030mm

.0015"

.038mm

.0017"

.043mm

.002"

.051mm

.0025"

.064mm

.003"

.076mm

.003"

.076mm

45-55Rc

150

55-65Rc

50

Non- Ferrous N

Al/Al Alloys

500

 

.0011"

.028mm

 

.0017"

.043mm

 

.0022"

.056mm

 

.0027"

.068mm

 

.0032"

.081mm

 

.0042"

.107mm

 

.0065"

.165mm

 

.0085"

.216mm

 

.0092"

.234mm

Brass/Bronze

400

Mg/Mg Alloys

700

Plastics/Bakelite

800

Formulas

Speeds - Inch

SFM = surface feet per minute

RPM = SFM X 3.82 / Tool Diameter

Speeds - Metric

SMM = surface meters per minute

RPM = SMM X 318.06 / Tool Diameter

Radial Depth of Cut in Percentage of Diameter

50%

30%

20%

15%

10%

5%

1%

CLF = chip load factor

1.0

1.1

1.2

1.4

1.8

2.3

5.0

Feeds - Inch

IPM = inches per minute IPT = inches / tooth

IPM = RPM X number of teeth X CLF X IPT

 

Feeds - Metric

MMPM = mm per minute MMPT = mm / tooth

MMPM = RPM X number of teeth X CLF X MMPT
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