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Gundrilling
is a highly flexible, efficent and quick method of producing
deep or shallow close-tolerance holes with smooth surface
finishes-usually in one pass. This often eliminates the
need for reaming, honing, or other finishing operations.
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Less known are the potential advantages of shallow hole
and deep hole gundrilling. Depending on the material and
application, gundrilling is always more precise, and often
faster than conventional drilling.
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Tolerances as close as 0.0003" have been consistenly held,
and surface finishes of 16 to 20 microinches are expected
in gundrilling. Many different types of materials are
used in projects ranging from cast iron to tool steel
with hardnesses up to 46 R/c.
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When gundrilling, secondary operations such as deburring,
reaming and work hardening are eliminated.
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Cast
iron, aluminum, brass, molybedenum, steel, heat-treated
stainless, polycarbonates, plastics, and many other materials
too tough to twist drill normally are easily gundrilled.
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Because of the chip formation specific to gundrilling,
chips can be discharged continuously from the cutting
area by a high pressure coolant saving machine time. This
allows holes to be drilled with no pecking 2 to 6 times
faster than conventional drilling. Deep holes with 100
to 200 times the diameter can be drilled in a single pass.
- Cost
savings when gundrilling occur in part because of long
tool life. The gundrill can be reground 40 to 60 times
on universal tool grinders by specially trained machinists.
This long service life also makes it cost-competitive
against twist drills.
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