Manual Makita DBM 131 (page 42 of 61) (English, German, Dutch, Danish, French, Italian, Spanish)

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Instructions for Using Diamond Core Drilling Bits

1. Dry Drilling

1.1 Only perform dry core-drilling on brickwork and soft lime or soft sand stones.

1.2 Vacuum the dust away. Rock and masonry dust is harmful. We strongly recommend

you to wear a face shield as well. Employ suitable type of vacuum and which also

have ample of suction power. Plentiful suction air offers additional benefit of cooling

the core drill’s body and free of dust, running more freely. Moving core drill slightly

back every now and then during coring process will make dust extraction more effective.

In doing so make sure not to tilt the core drill bit, as this will substantially shorten its

useful life.

1.3 Use solid pilot inserted into the core-bit until a starting groove about 5mm deep is cut.

Then remove pilot bit, otherwise it will start overheating and become unnecessarily

defective.

Alternatively you can also use separate hammer drilling machine to make a pilot hole

which then renders removal of the pilot from core bit unnecessary.

2. Wet Drilling

2.1 Concrete and natural (hard) stone must be core-drilled wet.

2.2 Ensure sufficient water flow. There has to be enough water to flush all the residue out

of the groove. A 100mm diameter core can require up to 5 lit/min of water supply. If

using pressurised water container, make sure it will deliver the required amount.

2.3 Starter hole guides and drill rigs assist accurate starts and guidance. These are also

available with a water collecting facility. If neither starter hole guide nor drilling rig are

available, use wooden template to ensure drilling starts in the proper place.

2.4 When using drilling rig, make sure that:

• drilling machine is mounted securely;

• the feed control is engaged and that drill does not move by its own weight;

• the stand is mounted securely.

Improperly secured drilling rigs can cause jamming of the core bit and breakage of the

segment(s).

2.5 For safety, the drill stand should be secured in one of the following

ways:

• with bolt anchor, washer and quick fastening bolt (use anchor for at least 50mm setting

depth).

• with vacuum base (vacuum kit and pump required)

• masonry or other work substrate surface need to be flat, cracks and pores free. This

method is not suitable for tiled surfaces. When drilling horizontally (wall) or ceiling

drilling, additionally secure the drill to prevent falling by the use of straps or rope.

• with Quick Clamping Column: Brace or prop-up against the centre of the column base

or clamping head.

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Makita DBM 131 Manual

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