The angle grinder is an electric tool designed mainly for side and peripheral grinding (cut-off grinding) of various materials, mainly metal. The working shaft is arranged at right angles to the motor shaft. The angle grinder has a maximum speed corresponding to the grinding wheel diameter.
Small angle grinders
Small angle grinders are hand-held angle grinders for rough, cut-off and surface grinding for use in trade, agriculture, workshops and in industry as mobile units. Small angle grinders with universal motor and speeds of 10 000 1/min with 115 mm or 125 mm grinding wheel diameter. Circumferential speeds of 60 m/sec or 80 m/sec are common, but this design results in a speed drop between full load and idling.
Small angle grinders with universal motor and Constant-Electronic
The speed of these machines is kept constant regardless of the load. With optimum grinding patterns, the electronics also result in additional savings of about 20 percent in grinding costs. Built-in overload protection through electronic current limitation.
Small angle grinders with universal motor and Constant-Electronic and additional speed reduction. A short contact pressure is sufficient to obtain the desired grinding speed of 11000 rpm. The automatic speed reduction at idle reduces the noise level by 60 percent. Built-in overload protection through electronic current limitation. Small angle grinders with universal motor and infinitely variable speed selection, whereby the set speed can be kept constant by a constant electronic. Built-in overload protection by electronic current limitation is possible. The special application of this grinder is the material-specific polishing, brushing, cutting, roughing and grinding of various materials.
Large angle grinders
Large angle grinders with universal motor and often with starting current limitation. These angle grinders are designed for tough continuous use for cutting, roughing, grinding and brushing. Several power classes between 1200 and 2500 watts for 8500 and 6500 rpm each can be selected.
Special angle grinders
Special angle grinders with universal motor is an angle grinder with bow handle for extremely deep cuts up to 100 mm in steel or stone with a power consumption of up to 2500 watts at 5000 rpm. For safe guidance this grinder is equipped with a guide carriage, a protective hood with additional dust extraction connection is available as an optional extra.
Large angle grinders as polishers
The polisher is a power tool with a rotating machine tool designed for polishing various materials or for dry stone grinding. The polisher can have several speeds. With the machine tools it is possible to work on the circumference and on the side. The peripheral speed of the machine tools is low in comparison with other grinding machines with rotating machine tool, below 2000 rpm. Best are 1600 rpm. With the associated peripheral speeds, the polisher is below 16 m/s and can therefore be used without a protective hood.
Angle grinder with HF (high frequency) motor
Angle grinder with high frequency motor are available with input powers from 470 to 3400 watts and speeds from 1100 to 12 000 rpm.
Pneumatic angle grinders
Pneumatic angle grinders are called vertical grinders, which are manufactured in the usual speeds with output powers up to 3500 W.
More than half of all abrasives are used in the form of grinding wheels. For the large number of grinding wheels (and grinding tools DIN 69 123 to 69 188) standardized according to DIN 69 120, the following basic statement applies: For the grinding process, the hardness of the grinding wheel achieved by the bond is the most important factor, as it has the greatest influence on the cutting performance.
Fibre-tip abrasive sheets
The basis of the fibre abrasive sheets is a fibre material which has pressed and chemically treated cotton fibres as a carrier material for the abrasive. Surface sanding, rust removal and polishing work is carried out with flexible rubber discs and applied fibre sanding sheets.
Fibre sanding discs
1 support plate
2 Fibre sanding sheet
3 Fixing nut
Angle grinders are angle grinders on which cut-off wheels with a diameter of 300 mm or more are operated. The large cut-off wheel-The large cutting diameter results in the large cutting depth usually required for cutting work. For cutting rock materials, cut-off machines are equipped with a cutting carriage that enables angle-true cuts and helps to prevent the cutting wheel from tilting in the material.