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
Hardened,
stainless steel
7,7
0,50
4,03
13,60
32,25
108,86
258,03
Tungsten car-
bide
14,9
0,97
7,8
26,33
62,41
210,64
499,3
To determine the weight of the balls to be used, 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 1250 x 5 mm agate
balls.
Calculation: 0.17 g * 1250 pcs
»
212.5 g
212.5 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
CAUTION!
For wet grinding with large balls with a diameter of >10
mm, at least half the maximum sample quantity must
be inserted. If the suspension is highly fluid, the balls
will not have any resistance and the balls and the
grinding bowl could be damaged. The result is the same
as if it had been filled with no grinding stock. The same
applies to dry grinding with less than the minimum
sample quantity.
NOTICE!
Never operate the mill without grinding stock! This can
lead to grinding balls and grinding bowls getting dam-
aged.
Using the device
- 32 -
