FRITSCH PULVERISETTE 5/4 classic line - Manual (Page 32)

6.1.3 Calculated weight of a ball
Ball diameter in mm 5 10 15 20 30 40
Material Density
in g/cm 3
Calculated weight of a ball in g
Agate 2,65 0,17 1,39 4,68 11,1 37,46 88,8
Silicon nitride 3,25 0,21 1,7 5,74 13,61 45,94 108,91
Sintered
corundum
3,9 0,25 2,04 6,89 16,33 55,13 130,69
Zirconium
oxide
5,7 0,37 2,99 10,07 23,88 80,58 191,01
Stainless steel 7,8 0,51 4,08 13,78 32,67 110,27 261,38
Tempered steel 7,9 0,52 4,13 13,96 33,09 111,68 264,73
Tungsten car-
bide
14,9 0,97 7,8 26,33 62,41 210,64 499,3
To determine the weight of the required balls, the "calculated weight of
a ball" is multiplied by the "number" of balls required.
Example: A 250 ml agate bowl is to be filled with 1221 agate balls with a
diameter of 5 mm.
Calculation: 0.17g * 1221 St » 208 g
208 g of grinding balls can be weighed and inserted in the grinding bowl,
thus avoiding the time required for counting the balls.
6.2 Filling quantities of grinding bowls
NOTICE!
Never operate the mill without grinding stock! This can lead
to grinding balls and grinding bowls getting damaged.
NOTICE!
If the minimum filling quantity is fallen short of, increased
wear due to abrasion is to be expected. This can cause
irreparable damage to the mill components.
Using the device
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