Dust Extraction - Bosch GBH2-28L Operating/Safety Instructions Manual

2610047986_GBH2-28L 10/2/17 1:47 PM Page 11
TOOL TIPS
Following a few simple tips will reduce wear
on the tool and the chance of injury to the
operator.
NOTE: The high efficiency available from
the rotary hammers can only be obtained if
sharp and undamaged accessories are used.
The "cost" to maintain sharp and undamaged
accessories is more than offset by the "time
saved" in operating the tool with sharp
accessories.
All hammers require a short period of time to
warm up. Depending on the room
temperature, this time may vary from
approximately 15 seconds (90˚F) to 2
minutes (32˚F).
A new hammer requires a break-in period
before full performance is realized. This
period may require up to 5 hours of
operation.
You will extend the life of your bits and do
neater work if you always put the bit in
contact with the workpiece BEFORE pulling
the trigger. During operation, hold the drill
firmly and exert moderate, steady pressure.
Too much pressure at low speed will stall the
hammer. Too little pressure will keep the bit
from cutting and cause excess friction by
sliding over the surface. This can be
damaging to the drill and bit.
Carbide tipped bits: Used for drilling stone,
concrete, cement, brick, cinder block and
other unusually hard non-metals.
3-JAW CHUCK
(Drill only mode)
The 3-Jaw Chuck with SDS-plus
Adaptor accessory can convert your tool for
use with straight shank bits.
Shanks of all drill bits should be wiped clean
prior to using and immediately after
removing.
Recall these instructions for safe
operation:
1. All work must be supported or secured
before drilling and steady, even pressure
applied in line with the drill bit.
For selection of dust collection systems and
operating instructions, see the Operating /
Safety Instructions for 'Dust Extraction
2. As the drill bit cuts through the opposite
side, reduce the pressure and continue
running the drill as the bit is withdrawn.
3. Some materials require slow drilling
speeds; whereas, others require higher
speed to produce the best results.
Materials such as glass, porcelain,
ceramics, tiles, plastics, etc., should be
drilled at low speeds with specially
designed drill bits and lubricants.
DRILLING WOOD OR PLASTIC
If backing block is not used, ease up on the
pressure just before the bit breaks through
the wood to avoid splintering. Complete the
hole from the opposite side immediately after
the point breaks through. If bit binds, reverse
the drilling operation to help remove the bit
from the work.
There are two rules for drilling hard materials.
First, the harder the material, the greater the
pres sure you need to apply to the tool.
Second, the harder the material, the slower
the speed. Here are a couple of tips for
drilling in metal. Make a center punch in the
material for easier starting. Lubri cate the tip
of the bit occasionally with cutting oil except
when drilling soft metals such as alu minum,
cop per or cast iron. If the hole to be drilled is
fairly large, drill a smaller hole first, then
enlarge to the required size, it's often faster
in the long run. Main tain enough pressure to
assure that the bit does not just spin in the
hole. This will dull the bit and greatly shorten
®
Shank
its life.
Use carbide-tipped masonry bit for cinder
block, mortar, common brick, soft stone and
other materials. The amount of pressure to
be used is dependent upon the type of
material being drilled. Soft materials require
less pressure while the hard materials need
more pressure to prevent the drill bit from
spinning.

Dust Extraction

Attachments for Hammers and Hammer Drills'
included with your tool or with the dust
extraction attachment.
-11-
(Drill only mode)
DRILLING METAL
(Drill only mode)
DRILLING MASONRY