Diamond Drilling Systems. - Hilti

Difficulty starting
hole with core bit
Core bit does
not cut optimally
Core bit sticks
Excessive axial
segment wear
Radial segment
wear
Segments
break off
Water does not
flow out of the hole
Core sticks
inside core bit
Diamond Core Bits
Problems and solutions
Cause Solution
n Core bit not sharpened (dressed) n Sharpen (dress) core bit
n Carriage / rail worn (play) n Check carriage / rail etc. for play
n Core bit is deformed n Check that the core bit runs true,
use other core bit
Diamond Systems
n Wrong speed selected n Check the speed (select correct gear)
n Drilling pressure too low n Increase drilling pressure
n Motor power is inadequate n Reduce speed
n Segments are polished (better use of available power)
n High steel reinforcement content n Sharpen (dress) the core bit
(Symptom: clear water flows out / n Use special core bit
metal cuttings) (ask a diamond drilling specialist)
n Segments are too hard n Ask a diamond drilling specialist for advice
n Inadequate clearance n Release the core bit (withdraw the core
n Insufficient water bit while turning backwards and forwards
n Core bit barrel deformed using open-end wrench)
n Loose rebar / aggregates Check segment clearance
n Radial force too high n Check water flow rate
n Rig not fastened rigidly n Check core bit barrel
n Check carriage / rail for play
n Check that rig is fastened rigidly
n Wrong speed selected n Reduce drilling pressure
n Drilling pressure too high n Increase speed (r.p.m.)
n Motor power too high n Increase water flow rate
n Insufficient water (check that water flows out)
n Very abrasive material n Use a special core bit
(possibly also with high reinforcement n Ask a diamond drilling specialist
content) for advice
n Segments are too soft
n Radial forces too high as a result n Check that rig is fastened rigidly
of rig working loose during drilling Check condition of parts (carriage / rail)
n Core bit wanders n Prevent core bit from wandering by
n Insufficient water starting holes cautiously
n Rig not fastened rigidly n Increase water flow (better flushing)
n Too much play at carriage / rail Check water channels in core bit
n Insufficient water / no water, n Check water supply / flow rate
loose rebar or aggregates n Check that rig is fastened rigidly
n Vibration when starting hole Check condition of parts
caused by rig not fastened rigidly n Have core bit repaired
n Use of excessive force Note:
Broken segments must always be
removed from the hole in order to
prevent further damage
n Layer of material causing a seal inside n Check water flow (machines and core bit),
core bit (carpet, insulation layer) break out and remove core
n Water channels in the core bit worn n Clear or re-establish water channels
away or obstructed in core bit / retip the core bit
n Use a water flow meter
n Steel fragments jammed between n Release the core form the core bit
core and core bit barrel n Localise the spot causing jamming
n Core bit barrel deformed n Drill out the problem spot
n Core broken in several pieces
n Radial segment wear
0800 886 100 | www.hilti.co.uk
1850 287 387 | www.hilti.ie
Hilti. Outperform. Outlast.
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