Masonry / Concrete Cutting
With this grinder it is possible to perform cutting of concrete and masonry materials. When cutting, work with moderate feed, adapted to the material being cut.
Always follow precautions for kickback.
Operate the tool with a dust extraction system and personal dust protection, e.g. respirator, dust mask, etc. The vacuum used for this application must be approved for the extraction of masonry and concrete dust. Bosch sells suitable vacuum cleaners.
Never pull the tool backward since blade will climb out of
the material and KICKBACK will occur.
1. Allow the tool to reach full speed before touching the tool to the work surface.
2. If plunge cutting:
a. Tilt tool forward with wheel lined up with the cut line and hold the tool by the grinder body and the auxiliary handle (Fig. 21).
b. Gradually lower the rear of tool using the front end of the foot as the hinge point.
c. When the foot rests flat on the surface being cut, proceed cutting in forward direction to end of cut.
3. Always maintain contact between the guard foot and work piece.
4. Slide the tool forward at a moderate speed adapted to the material being cut. Always cut towards the dust extraction port to maximize dust extraction and reduce likelihood of kickback (Fig. 22).
5. Apply minimum pressure to the work surface, allowing the tool to operate at high speed. Cutting rate is greatest when the tool operates at high speed.
6. When the cut is completed, remove tool from work piece before turning off. Allow wheel to stop rotating before setting tool down.
Tip: When performing deep cuts, it is best to cut in several shallow passes. Each pass should be only to the segment depth of the wheel. Masonry dust is abrasive and may wear and weaken the segment bond.
FIG. 21
FIG. 22
When cutting especially hard material, e. g., concrete with high pebble content, the dry diamond wheel can overheat and become damaged. This is clearly indicated by circular sparking of the rotating dry diamond wheel. In this case, interrupt the cutting process and allow the dry diamond wheel to cool by running the tool for a short period of time at the maximum speed with
Noticeable decreasing work progress and circular sparking are indications of a dry diamond wheel that has become dull. Briefly cutting into abrasive materials (e. g. brick) can resharpen the wheel.