Machine Operation
DITCHING
CROSS ROOM DITCHING
When removing hard to remove ceramic, VCT or VAT, cross-room ditching will help to make the removal easier. Using a blade 5 to 15.25 cm
(2” to 6”) in width, make ditches 30 to 60 cm (1’ to 2’) apart in the same direction the machine will be removing the goods (See Figure BB). This
“relieves” the pressure holding the tiles together. If ditching helps and the goods are coming up easy, try using a wider blade to ditch with.
CHECKER BOARD DITCHING
To make carpet removal and debris cleanup easier, checker board ditching is very helpful. Using as wide of a self-scoring blade as possible,
make ditches 1.2 to 1.8 m (4’ to 6’) apart crossways from the way the machine will be removing the goods (See Figure CC). Running the ma-
chine crossways from the ditches will make smaller pieces of debris to be hauled away. Instead of large gummy rolls of carpet, there are small
squares that can be rolled, palletized, put on a dolly or folded with the sticky side in. This makes removing the debris easier and reduces the
amount of debris.
BLADE SHARPENING
Always check for blade sharpness before using; because dull blades greatly reduce cutting effectiveness. Over time, the used blades will
develop a back bevel. While re-sharpening, blades will not recover entirely until the back bevel is completely leveled out. NOTE: Thinner blades
are easier to sharpen, but they also break easier.
•
Always wear gloves and safety glasses.
•
Grind blade using a 4” diameter disk with 120 or
fi
ner grit. Be careful not to catch disk on edge or corner of blade.
•
Pass grinder along blade edge starting on one end and continuing in one direction being careful to hold grinder at proper angle of blade.
Grind until sharp.
•
While using a high quality
fi
ne tooth hand
fi
le, follow the same procedure as above.
•
Blades are sharp. Use extreme caution.
•
Have plenty of sharp blades on each job so on-the-job blade sharpening is eliminated.
•
It is best to re-sharpen dull blades on proper bench or belt grinder in the shop, so the blades are ready for the next job.
SELF-SCORING BLADE SHARPENING
It is important to keep the “wings” on these self-scoring blades sharp. Use a
fi
le on the edge. Sharpen the
fl
at part of the blade, the same way
as described above.
CARBIDE TIPPED BLADE SHARPENING
To sharpen carbide tipped blades, a carbide grinding wheel is necessary, ie: silicon carbide or green wheel.
20
CROSS ROOM DITCHING
Ditch
2” to 6”
Blade
Tile
1’ to 2’
Strips
Figure BB
Run the machine the same direction
that the ditches are made
Carpet 4’ to 6’
apart
Use as
large of a
blade as
possible for
ditch
Figure CC
Run the machine crossways from the
directions that the ditches are made
CHECKER BOARD DITCHING
FIG. DD
FIG. EE
Back Bevel
Self-Scoring
Wing
www.nationalequipment.com
Phone: 763-315-5300
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