Retsch Emax - Manual (Page 36)

Operating the machine
36
5.7 Ball sizes and speeds
With this grinding device, a very large amount of energy enters the sample
material. This high amount of energy also acts on the grinding jar and the grinding
balls.
–
The following recommendations for the ball sizes used therefore apply
depending on the grinding jar size.
– Likewise note the recommended speeds depending on the grinding jar
material.
5.7.1 Recommended ball sizes
Grinding jar Ball size
125ml Up to 15mm
50ml Up to 12mm
5.7.2 Recommended speeds
The following speed restrictions apply to balls larger than 10mm:
Grinding jar material Revolutions per minute
Steel Up to 1500
Tungsten carbide (WC) Up to 1200
Zirconium oxide Up to 1200
5.8 Inserting the grinding jar
NOTICE
H0067
Strong vibrations and noises
Uneven loading
–
In the event of uneven loading the device can generate especially strong
vibrations and noises.
• Always use 2 grinding jars.
• Switch the device off immediately in the event of strong vibrations
and noises and check the number and gross weight of the jars.