20
FIG. 20 – COOLING DRILLING WITH SPIRAL BIT
Start drilling
with discharge of
lubrocoolant
Drilling
Finish drilling
with removal of swarf and
switching off of
lubrocoolant
Approach
FIG. 19 – COOLANT DRILLING WITH BROACH CUTTER
8.3) Drill fitted 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spindle fully withdrawn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 fitted on the
spigot of the spiral bit; it must therefore be activated, by opening the tap (02), before starting to
drill, then switched off after drilling by closing the tap.
FIG. 20b
PE 170 - PE 275 spiral bits
(drilling diameters from 17 to 27,5 mm)
FIG. 20a
PE 70 - PE 165 spiral bits
(drilling diameters from 7 to 16,5 mm)
DPE spacer
APE adapter
Spiral bit
The slug is ejected upon completion of the drilling operation