User Manual

4.1.2 Number of Balls per Grinding Jar
A larger number of balls reduce the grinding time, and the grinding result will lie within a
narrower grain band width.
Ball Ø (mm)
Jar volume (ml)
100
250
500
5
Number of balls (piece)
250 - 300
1200 -
1300
2000 - 2500
10
Number of balls (piece)
25-30
50 - 150
100 - 250
15
Number of balls (piece)
10
45 - 50
70 - 100
20
Number of balls (piece)
5
15 - 20
25 - 35
30
Number of balls (piece)
5 - 6
10
40
Number of balls (piece)
4
These values are just clues: the number of balls should be determined experimentally if
necessary.
For Ø 30 and Ø 40 mm balls, please keep the machine under observation during operation.
Because of the vibrations, there is a danger of the machine creeping.
4.1.3 Calculated Ball Weight
Ball Diameter (mm)
3
5
10
15
20
25
Material
Density (g/cm
3
)
Calculated Ball Weight (g)
Stainless steel
7.93
0.11
0.52
4.15
14.01
33.20
64.84
Zirconium dioxide
6.06
0.09
0.40
3.17
10.70
25.37
49.55
Agate
2.65
0.04
0.17
1.39
4.68
11.09
21.67
Sintered corundum
3.8
0.05
0.25
1.99
6.71
15.91
31.07
Tungsten carbide
14.95
0.21
0.98
7.82
26.41
62.59
122.25
4.2 Filling the Grinding Jar
It is imperative that the following sequence be observed:
1. Place the grinding balls in the empty jar.
2. Fill the material to be ground on the balls.
Never use the mill without sample material!
Danger of badly damage of the grinding balls and jars!
4.3 Influencing Quantities During Grinding
Grinding time