Speed & Feed Charts


Oil Pressure, GPM, Unsupported Drill Length

Gun Drill Machine

Dia. (inch)Oil Pressure (PSI)GPM (per spindle)Max. Unsupported Length
High SFMLow SFM
<.055" 2500.20N/AN/A
.062" 2000.25N/AN/A
.078"1800.353"5"
.094"1500.504"6"
.125"1500.905"8"
.187"11501.606"12"
.250"9252.508"16"
.375"6754.5012"24"
.500"5257.0016"32"
.625"45010.020"40"
.750"40014.024"48"
1.00"30020.032"56"
1.25"25028.040"64"
1.50"20036.048"72"
Water soluble coolant must be oil based, high "EP" at 10-12% concentration, NO SYNTHETICS!
Solid carbide flute & tip.
Minimum oil/coolant pressure is 35% of the PSI values. If at minimum, reduce SFM by 35%.