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Grinding device

Belongs to:
Tools
Synonyms:
Angle grinder, Band grinder, Delta grinder, Disc grinder, Eccentric grinder, Grinder, Oscillating grinder, Pendulum grinding machine, Sander, Sanding machine, Side grinder
Description:

A grinding machine is an electric tool for smoothing and polishing of surfaces or to remove coatings from surfaces. Therefore a grinding surface (band, plate, disc) with a suitable roughness is moved along the work piece.

In the following, measurement data of different types of grinding machines (angle grinder, band grinder, oscillating grinder) can be found.
Band grinder use an endless abrasive belt which runs around two rolls (drive roll and deflection roll).
Oscillating, eccentric and delta grinder have a vibrating and sometimes slow rotating pad which is attached with a sandpaper or abrasive.
Angle grinder use a cutting or abrasive disc which is fast rotating. The edge of the disc then is used to treat the work piece.
Pendulum grinding machines are large angle grinders with high power and they are too heavy for a handheld device.

The emitted alternating electric and magnetic fields are mainly caused by the electric motor which is why electric emission can occur also in the kHz frequency region.

Frequency ranges:
  • 50–60 Hz
Type of field:
electric and magnetic

Measurements (acc. to literature)

band grinder
Measurand Value Feature Remarks
electric field strength 577 V/m (maximum, calculated) - at the surface of the device at 50 Hz [1]
electric field strength 1.636 kV/m (maximum) - at the surface of the device at 50 Hz [1]
magnetic flux density 1.181 mT (maximum, calculated) - at the surface of the device at 50 Hz [2]
delta grinder
Measurand Value Feature Remarks
electric field strength 2.816 kV/m (maximum, calculated) - at the surface of the device at 50 Hz [1]
magnetic flux density 683 µT (maximum, calculated) - at the surface of the device at 50 Hz [2]
eccentric grinder
Measurand Value Feature Remarks
electric field strength 1.791 kV/m (maximum, calculated) - at the surface of the device at 50 Hz [1]
magnetic flux density 965 µT (maximum, calculated) - at the surface of the device at 50 Hz [2]
pendulum grinding machine
Measurand Value Feature Remarks
magnetic flux density 1.081 mT (maximum, calculated) - at the surface of the device at 50 Hz [2]
oscillating grinder
Measurand Value Feature Remarks
electric field strength 2.088 kV/m (maximum, calculated) - at the surface of the device at 50 Hz [1]
magnetic flux density 1.081 mT (maximum, calculated) - at the surface of the device at 50 Hz [2]
angle grinder
Measurand Value Feature Remarks
electric field strength 1.814 kV/m (maximum) - at the surface of the device at 50 Hz [1]
magnetic flux density 2.243 mT (maximum, calculated) - at the surface of the device at 50 Hz [2]

References

  1. Leitgeb N et al. (2008): Electric emissions from electrical appliances.
  2. Leitgeb N et al. (2008): Magnetic emission ranking of electrical appliances. A comprehensive market survey.