Bosch 1638 Operating/Safety Instructions Manual page 7

BM 2610995759 11/00 11/16/00 11:50 AM
REMOVING AND INSTALLING THE "CLIC"
DEPTH GUIDE ASSEMBLY
The depth guide assembly consists of the
depth guide, locking knob and bracket.
Twist the whole assembly counter clockwise
approximately 1/8 of a turn. Then pull the
whole assembly straight off of the tool. To
re-attach the assembly, align the notched
area of the depth guide bracket with the
protrusion on the spring which is attached to
the tool collar. Then push the assembly over
the collar and twist it clockwise about 1/8
turn until the spring clicks in place.
Disconnect the plug from
WARNING
!
the power source before
making any assembly, adjustments or
changing accessories. Such preventive
safety measures reduce the risk of starting
the tool accidentally. Make certain that the
collet nut is securely tightened before
turning the tool on.
MAKING DRYWALL CUT OUTS
After assembling the bit into the tool as
described earlier, it will be necessary to
review the instructions provided below and
make some practice cut-outs with this tool
before attempting an actual job. The best
method is to take some scrap pieces and
nail or screw them in place over wall studs
which have an electrical box or other feature
in place. A few such exercises will give you
the necessary practice to make clean,
professional cutouts around whatever is
behind the drywall you are installing.
Do not attempt to use this
WARNING
!
tool to make cut-outs
around any fixture or opening which has
live electrical wires, or on any wall which
may have live electrical wiring behind it,
as the bit could conduct current to the
tool, creating an electrocution hazard for
the operator. Shut off breakers or remove
fuses to disconnect the circuit. Always hold
the tool by its thermoplastic housing, and
always wear eye protection when operating
this device.
•Step 1: Be certain that the box or fixture
which requires a cut-out is firmly mounted
and all wires or other obstructions around
the opening are pushed back out of the way.
The drywall cut-out bit uses the outer edge
of the box or fixture as a guide, so it is
important that there is nothing in the way
which can prevent it from guiding completely
around the opening. For the purposes of this
instruction manual, the procedure discussed
will be to make a cut-out around a standard
2 1/8" x 3 3/4" electrical box.
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•Step 2: Before fastening the drywall sheet,
make a mark close to the center of the
opening in the box on the side of the drywall
facing you. You may then begin to screw or
nail the sheet to the wall, but do not install
fasteners closer then about 15" to the box,
or the sheet will likely bulge and crack
before you cut the opening.
•Step 3: Holding the tool firmly switch the
tool to the "ON" position as described
earlier.
•Step 4: Holding the tool firmly with both
hands, push the bit through the drywall at
the mark you made in step 2. Guide the bit
to the right until you feel it make contact with
the inside edge of the box. Then retract the
bit slightly, (do not pull entirely out) to allow
it to penetrate through the drywall and
contact the outside edge of the box by
continuing to move the tool slightly to the
right as you cut.
•Step 5: Keeping the bit in contact with the
outside of the box, move the tool counter-
clockwise to create the opening. When
rounding a corner, keep applying light
pressure towards the center of the box while
moving the bit steadily and smoothly around
the whole box until the entire cut has been
completed. Slide the switch to the "OFF"
position, and pull the bit free of the drywall.
You may then remove the piece you have
cut, and you will have a smooth opening.
The rest of the screws or nails may now be
put in place on the drywall sheet, and the
task is completed.
The motor may stall if
CAUTION
!
improperly used or over-
loaded. Reduce the pressure or feed rate to
prevent possible damage to the tool. Do not
attempt to start the tool when the bit is
engaged in the workpiece. Always be sure
the collet nut is tightened securely before
use.
MAKING CUT-OUTS IN MATERIALS
OTHER THAN DRYWALL
Your tool is capable of cutting many types of
building materials in addition to drywall.
There are several different bits available for
use on these materials. Most materials can
be cut with the "wood" bit, however the
"carbide" burr bits must be used for hard,
abrasive materials such as ceramic WALL
tile (will not work on ceramic FLOOR grade
tile), cement board, plaster etc.
To make cut-outs, insert and adjust the
proper bit according to previous instructions.
Hold the tool firmly and turn it on. Place the
depth guide at about a 45º angle against the
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