FRITSCH PULVERISETTE 13 classic line - Manual (Page 23)

4. With a feeler gauge (if unavailable normal printer paper that has
been folded once can also be used), set the gap to 0.1 mm using
the rotary handle.
This is set through a viewing gap above the grinding
chamber (2). The feeler gauge can be inserted
through the opening to set or check the gap width.
The feeler gauge must only be lightly clamped and it
must be possible to pull it out again by hand without
any problems.
5. Turn the stop screws all the way round and secure the lock nut
again. Reposition the cover cap.
6.2 Setting the gap width
Setting the gap width between the two grinding disks is carried out by
simply adjusting the rotary handle attached below the drive motor with
scaling (1 graduation mark - 0.02 mm).
Make sure that the gap width is always turned from a
bigger to a smaller distance with the rotary handle. If the
gap width is increased during grinding, this can lead to an
imprecise grinding result because of the play in the thread.
You should pre‐crush material that is difficult to grind in a
first pass with a larger gap width, before achieving the
desired fineness with a smaller gap in a second pass.
Proceed in the same way if no information about the grind‐
ability of your material is available. In this case, it is neces‐
sary to carry out preliminary tests with small sample quanti‐
ties.
Using the device
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