Retsch GM 300, Manual

Page: 23 / 44

Operating the machine
23
2. Use the face spanner ( SL ) to mount the knife dome and the bearing flange in
the grinding jar. (see diagram below)
NOTE
Before inserting the grinding jar , it is essential to ensure that the bearing flange
and the knife dome are positioned securely. If necessary, tighten the bearing
flange with the face spanner (SL).
Fig. 11: Use a face spanner to remove the knife dome
3. Put the knife in the grinding jar on the knife dome and let the knife lock into
place.
4. Fill the grinding jar with the sample to be ground. Depending on the material,
the filling level may be as high as up to 2 cm under the edge of jar.
CAUTION
Note that some materials may increase knife wear, damage the knife or
damage the jar.
The knife must not be reground.
CAUTION
If the sample to be ground is dry, use a steel grinding jar. Dry grinding stock
can become very hot and damage the PVC grinding jar.
5. Put the lid onto the grinding jar, with one or two sealing rings depending on the
material.
6. Insert the grinding jar with knife, grinding stock and lid into the device.
7. Close the flap on the device.
8. Make sure the grinding jar engages with the correspondingly shaped
projections.
NOTE
Protect the grinding jar from continuous exposure to sunlight or UV irradiation.
The PC jar is not infinitely UV-resistant.
SL