Positive peck drilling machine
Quackenbush™
Apex Tool Group SAS
themselves. These drills drill a short distance, then
retract from the hole to clear the chips and dissipate
heat, and then return to the hole and drill again, and
repeat this in-and-out motion until the process is
finished. This pecking motion gives the drill its name.
This is a unique advantage in the drilling of
deep close-tolerance holes, especially in stacks of
dissimilar materials.
With conventional drilling, drilling through aluminum
into materials such as titanium extracts chips of the
titanium out of the hole, which scratches the softer
aluminum and deteriorates the hole quality. But by
using the interrupted stroke of the peck drill, the
chips are smaller and are far less likely to create
problems.
This also reduces heat considerably, because the
drill is not in the hole continuously, building up heat.
Each time the drill retracts from the hole, it helps to
dissipate heat, significantly reducing distortion and
metallurgical change in the material.
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