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6 mass balance, 7 grinding duration, 6 mass balance 6.7 grinding duration – FRITSCH PULVERISETTE 7 classic line User Manual

Page 35: Using the device

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13 Spindle screw

14 Lock nut
Clamping

n

Place the sealing ring and the lid onto the bowl.

n

Place the grinding bowl in the grinding bowl holder on the cork disc;

do not force it!

n

Turn the spindle screw (13) all the way down until the pressure piece

of the rubber disc lies flush on the lid.

n

Screw the spindle screw by hand until tight.

n

Turn the lock nut (14) all the way down until it lies flush on the

clamping bracket.

n

Tighten the lock nut by hand.

DANGER!
After several minutes of grinding and in the cooling-down

phases, check that the spindle screw and the lock nut are

still firmly connected.

6.6 Mass balance

For mass balancing always clamp a bowl with a lid and sealing ring of the

same weight opposite as a counterweight. This bowl can be empty

(without balls or grinding stock), if the weight difference does not exceed

70 - 100 g.

NOTICE!
If the weights of the bowls differ too much, this may result

in the planetary micro mill shifting position on the sup-

porting surface.

6.7 Grinding duration

WARNING!
Burn hazard!
Grinding bowls can get very hot after long grinding dura-

tions. Wear protective gloves for removal after grinding or

during the grinding breaks.

Depending on the application, the grinding duration should be adapted

to the development of heat in the bowls. The temperature inside the

bowls is 20 - 30 °C warmer than the outer casing temperature.

Using the device

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