Starting Operation - Berner BWC 35 Manual Original

OBJ_BUCH-1829-002.book Page 20 Friday, October 9, 2015 12:03 PM
Swivelling Out the Cutting Unit
For a tool change, the cutting unit must be swiv-
elled out completely. Place the machine on a firm
surface. Turn the release lock 2 in anticlockwise di-
rection, using e. g. the spanner end of the two-pin
spanner 19.
 This releases the cutting unit and immediately
swivels it upwards by means of resiliance.
Dismounting the Clamping Assembly
(see figure A)
Press the spindle lock button 9 to lock the grinding
spindle.
 Actuate the spindle lock button only when the
grinder spindle is at a standstill. Otherwise, the
machine may become damaged.
Loosen the clamping nut 18 with the two-pin span-
ner 19 and unscrew the clamping nut 18. Remove
the spacer discs 17 and the mounting flange 15.
Clean the grinder spindle 14 and all parts to be
mounted.
Determining the Slot Width
The slot width results from the amount of spacer
discs 17 between the two diamond cutting discs 16
and the cutting width of the diamond cutting discs.
The slot width is calculated as follows:
Slot width = Thickness of the spacer discs + width
of the diamond cutting discs.
The allowable slot width is shown in the section
"Technical Data".
The machine can be operated with one or two dia-
mond cutting discs.
Mounting the Clamping Assembly (see figure A)
Set the mounting flange 15 onto the grinder spin-
dle 14. The mounting flange with its driving feature
must be properly seated on the grinding spindle.
Place the diamond cutting disc 16 and the spacer
discs 17 on the mounting flange 15.
 Regardless of the requested slot width, all
spacer discs 17 provided must always be
mounted. Otherwise, the diamond cutting disc
16 can become loose during operation and lead
to injuries.
Amount of required spacer discs:
3 pce. each 4 mm thick and 4 pce., each 6 mm
thick
At least one spacer disc 17 must be mounted be-
tween two diamond cutting discs 16.
When mounting the diamond cutting discs, ensure
that the direction-of-rotation arrows on the dia-
mond cutting discs match with the rotation rotation
direction of the machine (see direction-of-rotation
arrow on the gear case).
Press the spindle lock button 9 to lock the grinding
spindle.
Screw on the clamping nut 18 and tighten it with
the two-pin spanner 19.
20 | English
Swivel the cutting unit back again. Check the lock-
ing system of the cutting unit by pulling the handle.
When working with 2 diamond cutting discs 16, al-
ways replace them in pairs.
See graphics page for the mounting sequence.
Operation
Pre-selecting the Cutting Depth
 The cutting depth may only be pre-selected
when the machine is switched off.
The requested cutting depth can be pre-selected
with the depth stop 6.
Press the button for depth stop adjustment 5 and
push the depth stop 6 to the requested cutting
depth on the cutting-depth scale 4. Release button
5 again.
Ensure that the depth stop 6 is engaged again.

Starting Operation

 Observe correct mains voltage! The voltage of
the power source must agree with the voltage
specified on the nameplate of the machine.
Power tools marked with 230 V can also be op-
erated with 220 V.
Switching On and Off
 Before starting the machine, check if the cut-
ting unit has engaged in the upper position.
Otherwise the diamond cutting discs can touch
the workpiece, resulting in possible loss of con-
trol over the power tool when switching on.
To start the power tool, push the On/Off switch 10
forwards.
To lock the On/Off switch 10, press the On/Off
switch 10 down at the front until it latches.
To switch off the power tool, release the On/Off
switch 10 or, if it is locked, briefly push down the
back of the On/Off switch 10 and then release it.
To save energy, only switch the power tool on
when using it.
 Check the diamond cutting discs before use.
The diamond cutting disc(s) must be mounted
properly and be able to rotate freely. Carry out
a test run for at least one minute without any
load. Do not use diamond cutting discs that
are damaged, out-of-balance, or vibrate. Dam-
aged diamond cutting discs can rupture and
lead to injuries.
Reduced starting current
The electronic reduced starting current limits the
power consumption when switching the tool on
and enables operation from a 13 ampere fuse.
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