Gun Drills
Gundrilling Guidelines:
Gun drilling on a CNC or Manual Lathe or Mill File: Gundrilling guidelines
Operating Parameters:
For hole depths greater than 40 diameters deep, we suggest a shorter drill / longer drill combination
that will allow the drilled hole of the shorter drill to support the flute of the longer drill.
On a lathe or milling machine, a gun drill bushing to start a single flute gun drill is generally not
practical. Drill supports, chip boxes, etc., are also unnecessary.
Start a gun drill with a pilot hole drilled, reamed, or bored to the gun drill diameter +.0005” (+.001”
max.), -0 x ½ to 1 diameter deep. The shape at the bottom of a pilot hole is of no consequence.
Use oil, or oil-based, high “EP” water-soluble coolant at 10-12% concentration. NEVER use a
synthetic coolant as these provide no lubricating action.
General guidelines: Dia. Ideal psi Min. psi GPM@ ideal psi
.125 1500 500 1.0
.187 1150 400 1.6
.250 925 350 2.5
.375 675 300 4.5
.500 525 250 7.0
.625 450 200 10.0
.750 400 175 14.0
1.000 300 150 20.0
1.250 250 125 28.0
1.500 200 100 36.0
We offer our DM2000 / DM3000 Spraymist Kits as an alternative to high pressure coolant.
Operate with 100-125 psi air pressure. Start with a spindle speed the same as “Min psi” above
$198.13USD
Availability: In Stock to 1 Week
485450-GAO1250-1400-PCD 0.1250 x 10 Flute x 14 OAL inch Gun Drill PCD Polycrystalline Diamond Tipped
$1,040.99USD
Allow 20-30 Work days
$170.99USD
Availability: In Stock to10-18 workdays
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