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Heading 6
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Monitor your spindle load when running a high feed rate
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Running your spindle load too high may result in a damaged spindle

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Always start with your feed at 50% or below
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Gradually bring the feed rate up while monitoring chatter and spindle load

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With HSS drills always use a peck drill cycle
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Make your peck depths a maximum of half your drill diameter
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Example: 0.250 in drill diameter pecking at 0.125 depths

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For extra long drills reduce speeds and feeds by 30%-50%

Endmill Diameter (inches)
Surface Speed (SFM)
Feed Per Tooth (IPT)
1/8"
1/4"
1/2"
5/8"
3/4"
1"
300-375 SFM
300-375 SFM
300-375 SFM
300-375 SFM
300-375 SFM
300-375 SFM
0.0009
0.0018
0.0035
0.0045
0.0055
0.007
Tool Diameter (inches)
Surface Speed (SFM)
Cutting Feed (IPR)
0-1/8"
1/8-1/4"
1/4-1/2"
1/2-3/4"
3/4-1"
175 SFM
175 SFM
175 SFM
175 SFM
175 SFM
0.001-0.002
0.002-0.003
0.003-0.006
0.006-0.007
0.007-0.008
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With Carbide drills always check the manufacturers recomendation on what drilling cycle you should run.

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For extra long drills reduce speeds and feeds by 30%-50%

Tool Diameter
(inches)
Surface Speed
(SFM)
0-1/8"
175 SFM
0.004
1/8-1/4"
0.004-0.006
175 SFM
1/4-1/2"
0.006-0.009
175 SFM
175 SFM
3/4-1"
3/4-1"
175 SFM
0.014-0.016
Tool Diameter
(inches)
Surface Speed
(SFM)
100-250 SFM
0.001-0.004
100-250 SFM
0-1/8"
1/8-1/4"
100-250 SFM
1/4-1/2"
100-250 SFM
1/2-3/4"
100-250 SFM
3/4-1"
Cutting Feed
(IPR)
0.004-0.005
0.005-0.009
0.008-0.012
0.012-0.016
Cutting Feed
(IPR)
0.009-.014
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