35
In the case of a breakdown contact our Area Agent who will advise you on the problem and
give you the necessary instructions on how to dispatch the tool to our nearest service Centre; if
possible, attach a copy of the Test Certificate supplied by
Cembre
together with the tool or fill
in and attach the form available in the “ASSISTANCE” section of the
Cembre
website.
15.
RETURN TO
Cembre
FOR OVERHAUL
APPENDIX “A”
Factors which influence the number of holes that can be made according to the cutter used:
– Hardness of the material to be drilled.
– Thickness to be drilled.
– Stability of the drill clamping
and correct assembly of the drill cutters.
– Suitable lubrocooling (lubrication/cooling)
to keep the temperature of the cutter low so as
not to compromise the efficiency of the cutting edges, whilst at the same time facilitating the
removal of swarf.
– Contact time of the cutting edges of the cutter with the material to be drilled;
bear in mind that the faster the hole is made the greater the efficiency.
– Observance of these basic rules:
1
) Commence drilling by exerting light pressure on the advance lever, progressively increas-
ing and then relaxing it when the cutter is in the exit phase.
2) Avoid pressure surges and advance according to the diameter of the drilling diameter, to
avoid scratching the material or damaging the cutting edges of the cutter.
3) Remember that a cutter with efficient cutting edges requires a lower pressure than one with
which a certain number of holes have already been made.
4)
When holes are made close to raised lettering on the rails, commence drilling with very
light pressure
until the lettering disappears, to avoid possible breakage of the cutter.
5) Bear in mind that when operating on very hard rails, as in the case of quality 1100 steel, it is
advisable to increase the lubrocoolant flow rate.