FRITSCH PULVERISETTE 15 - Manual (Page 23)

6.1.3 Checking the gap width
The rotating knives must not touch the fixed knives. A cutting gap of 0.2 -
0.3 mm has been set between them at the factory.
The rotating knives must be aligned parallel to the fixed knives. Turn the
cutting rotor carefully by hand.
If the rotating knives are badly worn, it is possible to turn
them over once. See Ä ‘Setting the gap width’ on page 23.
6.1.3.1 Setting the gap width
Set the gap width as follows:
1.
Open the closing lid.
2. Before setting the fixed knives, check whether the rotor knives are
parallel.
If they are not parallel, correct the position of the
movable knives as described in Ä ‘Assembling the
rotating knives’ on page 31.
3. Position the rotating knife with the smallest gap by pushing it in
the direction of the left fixed knife until the knives are edge-to-
edge.
4. Depending on the degree of wear, loosen the retaining screw of
the left fixed knife by turning it halfway.
5. Use a 4 mm hexagon socket key to alternately move the rear and
front pressure screws parallel inward until at least a folded piece
of paper (or a 0.2 mm feeler gauge) is slightly clamped between
the fixed knife and the rotating knife.
6. Now, fasten the left fixed knife again with the retaining screw.
This may slightly increase the gap again. Then, the
retaining screws have to be loosened again slightly,
and the pressure screws have to be readjusted
slightly.
7. Mark the rotating knife which was used for the adjustment.
8. If the upper part of the housing is open, close it and screw it on.
9. Position the marked rotating knife opposite one of the right fixed
knives so that the knives are edge-to-edge. Align it as described
above using the retaining screw and pressure screws so that it is
parallel and there is a gap of 0.2 - 0.3 mm.
Using the device
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