DRAG 
DRAG 
Quick access to essential system features, including the dashboard for an overview of operations, network settings for managing connectivity, system logs for tracking activities.
Quick & easy to clean
Rapid fine grinding
Easy jar & ball exchange
Wide range of jar & ball materials
Jar volume: 50 ml – 500 ml
Expandable: 1 to 4 jar positions
CE-certified
End fineness <1 μm
Programmable control
The LM PBM laboratory planetary ball mill is universally applicable for quick dry or wet grinding of inorganic and organic samples for analysis, quality control, materials testing and mechanical alloying.
In synthesis, the LM PBM can be used for mixing and homogenization of dry samples, of emulsions and of pastes.
LAARMANN® Planetary Ball Mills consist of several cylindrical grinding jars (positioned on the sun wheel as shown on the figure) which are filled with loose grinding balls. Two superimposed rotational movements move the grinding jars.
Like in a planetary system the grinding jar rotates on an orbit around the centre. This rotational movement is the self-rotation of the grinding container superimposed. The resulting centrifugal and acting acceleration forces lead to strong grinding effects.
Depending on the speed ratio different movement patters of the grinding balls / media can be achieved. It can be achieved that the grinding media are crossing the grinding jar and loosen from the wall.
At hitting the wall of the grinding jar the sample will be stressed. At a different motion pattern the grinding balls roll over the sample and stress the ground material.
Features and benefits
The Planetary Ball Mill consists of several cylindrical grinding jars, positioned on a sun wheel. Each jar is filled with loose grinding balls. The system generates two superimposed rotational movements:
Orbit Rotation – The grinding jars rotate around the center like planets around the sun.
Self-Rotation – Each jar rotates on its own axis in the opposite direction.
This unique motion produces:
Strong centrifugal forces leading to intensive grinding effects.
Coriolis forces that enhance grinding interactions.
Different motion patterns, depending on the speed ratio, such as:
Balls crossing through the jar and impacting the sample against the wall.
Rolling motion of balls over the sample, applying stress and grinding pressure.
With a typical rotation ratio of 1:-2, the grinding jar rotates twice during one turn of the sun wheel, but in the opposite direction, enabling highly efficient grinding performance.
High-efficient fine grinding up to end fineness <1 µm
Multiple speed ratios available
Grinding jars from 50 ml to 500 ml in various materials
Suitable for long-term trials and continuous use
Automatic direction reversal to prevent agglomeration
Reproducible results with programmable grinding parameters
Expandable from 1 to 4 grinding jar positions
CE-certified
High-efficient fine grinding up to end fineness <1 µm
Multiple speed ratios available
Grinding jars from 50 ml to 500 ml in various materials
Suitable for long-term trials and continuous use
Automatic direction reversal to prevent agglomeration
Reproducible results with programmable grinding parameters
Expandable from 1 to 4 grinding jar positions
CE-certified
Will our equipment suit your requirements? Send us a test sample for evaluation. Our application laboratory is pleased to conduct pre-purchase trials on customer free supplied samples.
If you require a test-grinding please click the Questionnaire Milling button and fill out the form.
| Dimensions W x D x H | 759x480x548 mm |
| Working principle | impact, friction |
| Feed size maximum | < 10 mm |
| Number of grinding jars | 4/3/2/1 |
| Maximum volume of each grinding jar | 500ml |
| Minimum volume of each grinding jar | 50 ml |
| Maximum end fineness | < 1μm; < 0,1μm for colloidal grinding |
| Adjustment of grinding duration | Digital adjustable |
| Setting of grinding time | Digital, 00:00 to 99:59 |
| Interval operation | Yes, with direction reversal |
| Pause time | 00:00 to 99:59 |
| Speed ratio | 1:-2 |
| Sun wheel speed | 50-650 min-1 |
| Effective sun wheel diameter | 360 mm |