Working Advice

Protect the cutting disc against impact, shock and grease. Do not subject the cutting disc to lateral pressure.

• Set the cutting depth see Preselecting the Cutting DepthTo compensate for inaccuracies created when breaking out the strip of material to be removed, it is recommended that the cutting depth be set approx. 5 mm deeper than the required groove depth.
• Place the power tool with the rollers (9) on the surface of the workpiece.
• Switch on the power tool.
• Press the front handle towards the workpiece so that the diamond cutting discs can plunge into the material beyond the base plate. There will be some slight initial resistance to get through.
• Guide the power tool by both handles and with a moderate feed motion that is suited to the material being machined.
• The power tool must always work against the direction of rotation. If this is not done, there is a risk that it will push out of the cut in an uncontrolled manner. Guide the power tool in the working direction shown on the base plate.
• Once you have finished your work, swivel the power tool out of the groove with the motor still running.
• Switch the power tool off.
• The combination of a return spring and the initial resistance prevents the diamond cutting discs from protruding when the power tool is placed upright on the floor or a table as normal. If the power tool is in the starting position, i.e. the bar (31) is engaged in the hook (32), this minimises the risk of the power tool moving (due to frictional contact between the rotating diamond cutting discs and the surface on which it is placed) or damaging the surface if accidentally switched on. However, if the power tool is not in the starting position due to the application of force (e.g. set down heavily), the diamond cutting discs may briefly touch the surface or rest on it.

Do not attempt to reduce the speed of protruding diamond cutting discs by applying pressure from the side.

Use the break-out tool (34) to remove the remaining strip of material.

Curved cuts cannot be made, because this would cause the diamond cutting discs to jam in the workpiece.

When cutting through plate materials, these must be laid on a firm base or otherwise supported.

When breaking through walls (e.g. with a rotary hammer), you can largely prevent the material from chipping on the surface if you first use the wall chaser to create a groove with the maximum cutting depth.

When cutting particularly hard materials such as concrete with a high pebble content, the diamond cutting disc can overheat and become damaged as a result. This is clearly indicated by circular sparking, rotating with the diamond cutting disc.

If this happens, stop cutting and allow the diamond cutting disc to cool down by running the power tool for a short time at maximum speed with no load.

A noticeable slowdown in work progress or circular sparking are signs that the diamond cutting disc has become blunt. You can resharpen the disc by briefly cutting into abrasive material (e.g. lime-sand brick).

Recesses in load-bearing walls are subject to country-specific regulations. These regulations must be observed under all circumstances. Seek advice from the responsible structural engineer, architect or construction supervisor before starting work.