Working Advice - Berner BWC 35 Manual Original

OBJ_BUCH-1829-002.book Page 21 Friday, October 9, 2015 12:03 PM
Constant Electronic Control
Constant electronic control holds the speed con-
stant at no-load and under load, and ensures uni-
form working performance.
Overload Protection
When overloaded, the motor comes to a stop. Re-
lieve the load on the machine immediately and al-
low to cool down for approx. 30 seconds at the
highest no-load speed.
Restarting Protection
The restarting protection feature prevents uncon-
trolled restarting of the machine after an interrup-
tion in the power supply.
To restart the operation, switch the On/Off switch
10 to the Off position and start the machine again.
Note: Check the function of the restarting protec-
tion feature regularly by having the mains plug
pulled during operation and plugged in again after-
wards.

Working Advice

 Exercise caution when cutting slots in struc-
tural walls; see Section "Information on Struc-
tures".
 Do not strain the machine so heavily that it
comes to a standstill.
 Clamp the workpiece if it does not remain sta-
tionary due to its own weight.
 The machine may only be used for dry cutting.
Protect the cutting disc against impact, shock and
grease. Do not subject the cutting disc to lateral
pressure.
– Adjust the cutting depth, see section "Pre-select-
ing the Cutting Depth". To compensate inaccu-
racies that occur when breaking away the fin, the
cutting depth must be set approx. 3 mm deeper
than the requested slot depth.
– Place the machine with the chaser rollers 7 on
the surface to be worked. The cutting unit must
be in the uppermost position.
– Switch on the machine.
– Push the release button 3 upwards to release the
cutting unit. Slowly lower and plunge the cutting
unit into the material.
– Guide the machine with both handles, applying
moderate feed, suited to the material being
worked.
– The machine must always work in an up-grinding
motion. Otherwise, the danger exists of it being
pushed uncontrolled out of the cut. Guide the
machine in the direction of the working-direction
arrow 8.
– The machine can be both pushed or pulled in
the cutting direction. Vertical slots can easily be
cut by pulling the machine from top to bottom.
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– After finishing the working procedure, swivel the
cutting unit out of the slot with the machine still
running, until the cutting unit engages in the up-
permost position.
– Switch the power tool off.
Do not brake coasting diamond cutting discs by
applying sideward pressure.
 Diamond cutting discs become very hot during
operation; do not touch them until they have
cooled down.
Remove the remaining fin of the material with the
break-out tool 20.
Curved cuts are not possible, as the diamond cut-
ting discs could jam in the material.
When cutting through plate materials, ensure that
the materials are firmly backed on a surface or sup-
ported.
When breaking through walls, e. g. with a rotary
hammer, most of the chipping-off of the surface
material can be avoided by first cutting in a slot
with maximum cutting depth.
For cutting especially hard material, e. g., concrete
with high pebble content, the diamond cutting disc
can overheat and become damaged as a result.
This is clearly indicated by circular sparking, rotat-
ing with the diamond cutting disc.
In this case, interrupt the cutting process and allow
the diamond cutting disc to cool by running the
machine for a short time at maximum speed with
no load.
Noticeably decreasing work progress and circular
sparking are indications of a diamond cutting disc
that has become dull. Briefly cutting into abrasive
material (e. g. lime-sand brick) can resharpen the
disc again.
Information on Structures
Slots in structural walls are subject to the Standard
DIN 1053 Part 1, or country-specific regulations.
These regulations are to be observed under all cir-
cumstances. Before beginning work, consult the
responsible structural engineer, architect or the
construction supervisor.
The permitted slot depth and width depends on the
slot length, wall thickness and the building material
used.
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