Table 1. Approximate Cutting Speeds and Feeds for Standard Automatic Screw Machine Tools—Brown and Sharpe Table 1. (Continued) Approximate Cutting Speeds and Feeds for Standard Automatic Screw Machine Tools—Brown and Sharpe
Cut
Material to be Machined
Mild or Soft Steel
Tool Steel, 0.80–1.00% C
Brass a
Width or Depth, Inches
Dia. of Hole, Inches
Surface Speed, Feet per Min.
Surface Speed, Feet per Min.
Feed, Inches per Rev. 0.012
Feed, Inches per Rev. 0.010 0.009 0.014 0.012 0.010 0.008 0.007 0.010 0.015 0.030 0.002 0.004 0.003 0.006 0.0008 0.002 0.010 0.0006 0.003 0.002 0.0006 0.0007 0.0005 0.0004 0.0003 0.006 0.004 0.003 0.0025
Feed, Inches per Rev. 0.008 0.006 0.010 0.008 0.008 0.006 0.0045 0.008
Carbon Tools
H.S.S. Tools
Carbon Tools
H.S.S. Tools
Tool
… … … … … … … … … … … … … … … …
70 70 70 70 70 70 70 70
150 150 150 150 150 150 150 150
40 40 40 40 40 40 40 40
85 85 85 85 85 85 85 85 … … … … … … 80 80 60 60 75 75 60 60 85 85 85 85 85 85 85 85 15
1 ∕ 32 1 ∕ 16 1 ∕ 32 1 ∕ 16
Turned diam. under 5 ∕ 32 in. {
0.010 0.017 0.015 0.012 0.010 0.009
Hollow mills and balance turning tools {
Turned diam. over 5 ∕ 32 in. {
1 ∕ 8
3 ∕ 16
1 ∕ 4
…
Knee tools
1 ∕ 32 On Off …
0.020 0.040 0.004 0.006 0.005 0.008 0.001 0.0025 0.010 0.001 0.005 0.0025 0.0008 0.002 0.0012 0.001 0.0008 0.008 0.006 0.005 0.004
150 150 150 150 150 150 70 70
… 0.010 … 0.025 … 0.002 … 0.003 … 0.002 … 0.004
105 105 105 105 105 105 40 40
Turret
{ { {
Knurling tools {
Side or swing
… … … … …
Top
150 150 105 105 150 150 105 105 150 150 150 150 150 150 150 150 30
0.0005 0.0008
Pointing and facing tools
0.010—0.007 0.008—0.006
70 70 70 70 70 70 70 70 70 70 70 70 70 70 25
0.006—0.004 0.006—0.008
40 40 40 40 40 40 40 40 40 40 40 40 40 40 12
0.003—0.004 0.004—0.008
1 ∕ 8 or less 1 ∕ 8 or over
Reamers and bits
… …
… { … {
0.0004 0.002 0.0015 0.0004 0.0005 0.0003 0.0002 0.0002 0.0035 0.003 0.002 0.0015
End cut
{
… … … … … … … … … … …
Recessing tools {
Inside cut
1 ∕ 16 - 1 ∕ 8
1 ∕ 8 1 ∕ 4 3 ∕ 8 1 ∕ 2
Swing tools, forming
1 ∕ 32 1 ∕ 16
Turning, straight and taper b
1 ∕ 8
3 ∕ 16 …
Taps
…
…
…
a Use maximum spindle speed on machine. b For taper turning use feed slow enough for greatest depth depth of cut.
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