Dust/Chip Extraction; Operating Modes - Bosch GST 12V-70 Professional Manual Original

OBJ_BUCH-2905-001.book Page 16 Monday, July 4, 2016 2:41 PM
16 | English
Replacing/Inserting the Saw Blade
 When mounting the saw blade, wear protective gloves.
Danger of injury when touching the saw blade.
Selecting a Saw Blade
An overview of recommended saw blades can be found at the
end of these instructions. Use only T-shank saw blades. The
saw blade should not be longer than required for the intended
cut.
Use a thin saw blade for narrow curve cuts.
Inserting the Saw Blade (see figure A)
 Clean the shank of the saw blade before inserting it. An
unclean shank cannot be fastened securely.
Insert the saw blade 14 into the stroke rod 11 until it latches.
The SDS lever 18 automatically snaps to the rear and the saw
blade is locked. Do not manually press the lever 18 toward
the rear, otherwise you could damage the machine.
While inserting the saw blade, pay attention that the back of
the saw blade is positioned in the groove of the guide roller
10.
 Check the tight seating of the saw blade. A loose saw
blade can fall out and lead to injuries.
Ejecting the Saw Blade (see figure B)
 When ejecting the saw blade, hold the machine in such
a manner that no persons or animals can be injured by
the ejected saw blade.
Turn the SDS lever 18 forward towards the contact protector
19 to the stop. The saw blade is released and ejected.

Dust/Chip Extraction

 Dust from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dust can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dust, such as oak or beech dust, is considered car-
cinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials con-
taining asbestos may only be worked by specialists.
– As far as possible, use a dust extraction system suitable
for the material.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
 Prevent dust accumulation at the workplace. Dust can
easily ignite.
Connecting the Dust Extraction (see figures C – E)
Insert the vacuum connection 20 into the opening of base
plate 9.
Place a vacuum hose 21 (accessory) onto the vacuum con-
nection 20. Connect the vacuum hose 21 with a vacuum
cleaner (accessory). An overview for the connection of vari-
ous vacuum cleaners can be found at the end of these instruc-
tions.
1 609 92A 3B5 | (4.7.16)
To enable optimum dust extraction, use the splinter guard 22
if possible.
The vacuum cleaner must be suitable for the material being
worked.
When vacuuming dry dust that is especially detrimental to
health or carcinogenic, use a special vacuum cleaner.
Place the extraction hood 16 onto the contact protector 19.
Splinter Guard (see figure E)
The splinter guard 22 can prevent fraying of the surface while
sawing wood. The splinter guard can only be used with certain
saw blade types and only at a cutting angle of 0°.
Insert the splinter guard 22 into base plate 9 from the front.
The splinter guard 22 can also be fitted with the mounted
plastic sliding shoe 12.
Sliding Shoe (see figure F)
When working with sensitive surfaces, use the plastic sliding
shoe 12.
To put on the plastic sliding shoe 12, place the front edge of
the base plate 9 under the nose of the plastic sliding shoe 23.
Then press the power tool onto the plastic sliding shoe 12 un-
til it engages.
When using the plastic sliding shoe 12, the splinter guard 22
is inserted not into the base plate 9, but rather the sliding
shoe.
Operation

Operating Modes

 Before any work on the machine itself (e. g. mainte-
nance, tool change, etc.) as well as during transport
and storage, remove the battery from the power tool.
There is danger of injury when unintentionally actuating
the On/Off switch.
Orbital Action Settings
The adjustable orbital action allows for optimal adaptation of
cutting speed, cutting capacity and cutting pattern to the ma-
terial being worked.
The orbital action can be adjusted with the adjusting lever 8,
even during operation.
Orbital action switched off (level 0): No orbital action
Orbital action level I:
Orbital action level II:
The optimal orbital action setting for the respective applica-
tion can be determined through practical testing. The follow-
ing recommendations apply:
– Select a lower orbital action setting (or switch it off) for a
finer and cleaner cutting edge.
– For thin materials such as sheet metal, switch the orbital
action off.
– For hard materials such as steel, work with low orbital ac-
tion.
– For soft materials and when sawing in the direction of the
grain, work with maximum orbital action.
Small orbital action
Large orbital action
Bosch Power Tools