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Approach
Start drilling
with discharge of
lubrocoolant
Drilling
Finish drilling
with removal of swarf and
switching off of
lubrocoolant
FIG. 19 – COOLANT DRILLING WITH BROACH CUTTER
8.3) Drill fi tted with special spiral bit
Follow the sequence described in (§ 8.1), taking care to position the drill on the rail by keeping
the spindle fully withdrawn. Bear in mind that the coolant circuit, instead of being automatically
opened and closed by the guide bit, is kept open at all times by the DPE spacer fi tted on the spigot
of the spiral bit; it must therefore be activated, by opening the tap (02), (see § 4) before starting to
drill, then switched off after drilling by closing the tap.
DPE spacer
APE adapter
Spiral bit
FIG. 20 – COOLANT DRILLING WITH SPIRAL BIT
22
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