Since the resulting “blast” will be increased when using 2 cartridges
in the same hole, we recommend a suitable mat (carpet works well) be
placed over the material to be broken to avoid fly rock issues and muffle
the sound.
Whether using one or two cartridges, the cleanliness of the drilled
hole is always extremely important and should always be done
thoroughly to insure dependable operation of your Micro-Blaster and
avoid misfires.
Always observe all suggested safety precautions and use your
Micro-Blaster in a sensible and responsible manner
.
Breaking Concrete
As stated earlier, concrete, because of its relative softness and the
aggregate it contains, will require more shots to be placed closer
together than when breaking hard rock. Rebar and reinforcing wire will
also further reduce the tools capacity. Large masses containing these
reinforcements have been successfully broken by successive shots
starting at a free edge or corner and progressing through the mass.
Concrete slabs and poured walls, given their relative thinness,
should be drilled in the center of an exposed edge. This will allow holes
to be drilled to their proper depth (9 to 10 inches for single cartridge
shots and 12 inches for 2 cartridge shots). If no edge is exposed, very
shallow angled holes can be drilled and shot in the face of the concrete
(floors or walls). Care should be taken to drill the holes so that the
bottom of the hole is in the center of the material to be broken. To start
these shallow holes, begin by drilling at a right angles to the surface
(approximately 1/4 inch deep) and then swing the drill to the angle
required. Be careful not to drill too deeply when starting the hole, as you
may damage the tip of the drill when moving to the shallow angle
required. Pre-scoring the outline of the opening with a masonry saw,
then Micro-Blasting the material out will provide a more finished
appearance to the opening if required. It is good practice to score as
deeply as possible and if access is available to score from both sides.
Holes drilled in the corners through the wall or floor will aid in the proper
alignment of these scored lines and should be done before scoring.
Drilling in these slots may cause the tip of the drill to jam and damage the
bit.
