The new diamond range
Practical tips


Diamond cutting discs

Disc selection

The metal bond that fixes the diamonds and the quality of the diamonds are designed to suit the materials that can be worked on. It is important to select the right disc for the material.

Machine speed

If the speed drops, this usually means you are working with too much feed pressure. In extreme cases, this leads to the disc overheating and the segments glazing. If you listen closely when working with these discs, you will be able to increase their lifetime.

Cutting depth (step cutting)

Shallow cuts are more likely to lead to quick cutting and a long disc life. Deep cutting (in a single pass) leads to slow cutting and a shorter disc life or possibly to disc overload. As a general rule, it is quicker and more cost-effective to make several shallow cuts (known as “step cutting”) rather than one deep cut.

Feed rate

Do not press too hard. Instead try to feel the optimum feed rate. The weight of the machine will provide enough feed pressure.

Cooling intervals

To prevent the diamonds from overheating or becoming damaged.

Resharpening

If the cutting performance of the diamond cutting discs deteriorates, the disc can be resharpened by using it to cut into abrasive material (e.g. sandstone).

Correct use

In order to avoid any tension on the cutting disc and to achieve the highest possible cutting speed, you should always work at a right angle to the material and in straight lines. This means no curved cuts. Always mount the cutting disc in the direction of rotation shown on the disc, in order to achieve the optimum lifetime and cutting speed. Bosch power tools also have an arrow showing the direction of rotation.

Work safety

Always wear protective goggles, strong work gloves, protective clothing and sturdy footwear when working. Use suitable machines with a protective guard and dust extraction.

Diamond grinding heads

Selecting the right grinding head

The grinding head is subjected to sustained high load. It is therefore important to select the right grinding head for the material.

Feed pressure

When grinding horizontally, the weight of the machine is sufficient. Additional feed pressure is not necessary. Using the correct feed pressure facilitates self-sharpening and protects the segments against overheating. Reduce the feed pressure as soon as you hear the machine’s speed dropping. This will enable the segments to cool down, and the speed will increase back to the optimum level.

Correct use

Move the power tool in small circles to achieve a consistent grinding surface. This prevents the grinding head from leaving marks on the surface.

Diamond drilling

Dry drilling

Always use a drilling cross or a pilot drill bit when starting to drill with a hand-held tool. A drill stand should be used for large diameters. Use a high-performance dust extraction system to prevent jamming.

Dry or wet drilling

The materials that can be drilled into can be roughly divided into three groups:

1.
Many hard materials (e.g. reinforced concrete) can only be drilled wet.

2.
Soft, medium-hard and some hard materials can be drilled both wet and dry. How you drill depends on the situation on the construction site (structural work or interior fitting) and on the power tool used (dry or wet equipment). The drilling depth, the number of holes to be drilled, and the hole diameter are also important parameters in deciding how to work.

3.
Water-sensitive materials like aerated concrete or plaster must only be drilled dry.

Speed recommendation

Begin at a slow speed and feed rate. Use a drill stand where possible. Adjust the water supply for suitable cooling – grey water is an indication of correct water supply.

Rotational speed:
Always drill within the recommended speeds. If the speeds are too low, this leads to a reduced drilling rate. If they are too high, it leads to excessive segment wear or machine overload.

Feed pressure:
The feed pressure must be adapted to suit the material being drilled. Start at a low feed pressure until the core cutter is securely centred. Reduce or stop the feed when you hit hard materials (e.g. rebar), in order to prevent overheating. If the feed pressure is too high, this can lead to excessive segment wear or machine overload.

Work safety:
Reinforced steel must only be drilled through if approval has been issued by a specialist. Ensure that no power, water, gas or waste disposal lines are drilled through. Always use a power tool with a circuit breaker when wet drilling.

Diamond core cutter does not cut and “strays” when you start to drill a hole
Diamond core cutter does not cut and “strays” when you start to drill a hole

First possible cause:
Diamond core cutter is glazed or not sufficiently sharpened.

Solution:
Resharpen the diamond core cutter on a sharpening stone.

Second possible cause:
The machine is not properly secured and is moving.

Solution:
Check the machine and secure it firmly.

Diamond drill does not drill or drills with too little feed
Diamond drill does not drill or drills with too little feed

Possible cause:
Diamond core cutter is glazed or ground down.

Solution:
Resharpen the diamond core cutter by drilling in soft material or using a sharpening stone.

Diamond core cutter jams in the drilled hole
Diamond core cutter jams in the drilled hole

Possible cause:
The drilling residues (dust) are not being removed at regular intervals, so they are blocking the core cutter.

Solution:
The drilled hole must be cleaned at regular intervals to prevent drilling dust from accumulating because this blocks the core cutter.

Diamond core cutter wears down too quickly
Diamond core cutter wears down too quickly

Possible cause:
The drill is working with a hammer function.

Solution:
Diamond core cutters must only be used in normal drilling mode without a hammer function.

Segments no longer have any play at the sides
Segments no longer have any play at the sides

Possible cause:
Core cutter is damaged or bent.

Preventive measure:
Examine the core cutter. Check the thread and make sure that the bit is running centrically.

Segment breakage
Segment breakage

First possible cause:
The material was drilled dry.

Solution:
Very hard materials and hard reinforced concrete must not be drilled dry.

Second possible cause:
Too much feed pressure was applied during drilling.

Solution:

Reduce the feed pressure and give the core cutter enough time to drill.

Segments are bent inwards or outwards
Segments are bent inwards or outwards

Possible cause:
Too much feed pressure.

Solution:
Reduce the feed pressure to match the possible feed rate of the diamond core cutter.

Core gets stuck inside the diamond core cutter
Core gets stuck inside the diamond core cutter

Possible cause:
Heat expansion of the drilling material (not enough cooling water).

Solution:
Carefully work the core cutter free. Do not use force.

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