FRITSCH PULVERISETTE 2 - Manual (Page 34)

Functional part Task Test Maintenance
interval
Safety switch Operator safety Does the mill
stop when the
hood is
opened?
Before each use
Ventilation slots Cooling system,
electronics
Proper function,
clean when
soiled
Twice a year
8.3 Resharpening the grinding set
After prolonged use, scratches or irregularities may appear on the sur-
faces of mortar and pestle, in which grinding stock can get stuck.
It is possible to resharpen the grinding mortar by filling it with approx.
20 g of carborundum (0.5 mm silicon carbide abrasive, grain 60) and
operating the laboratory mortar mill in normal grinding mode for a
½ hour. Downforce should be set to 5-10 daN, and the lateral pressure
should be set to the 1st ring.
Choose a longer duration for the sharpening process depending on the
depth of the scratches and the type of grinding set. Wet grinding with
added water is recommended. If it is not possible to obtain abrasives,
aluminium oxide (sintered corundum) of the same grain size (0.5 mm)
can be used as an alternative.
Maintenance
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