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Usually only < 2 cm pieces should be fed to the machine to avoid a jamming of sample inside the feeding funnel. By the shape of your samples, a constant feeding was possible without the need to support the feeding with e.g. a brush.
To prevent a discoloration of ground particles, we recommend using grinding disks made of zirconium oxide instead of metal.
In the first trial, we ground the 5,2 kg of sample with a gap setting of 0,1 mm. For this, all resulting particles will show a fineness of < 100 µm in one direction. With smallest possible gap setting, we also observed that the sample inside the fully loaded grinding chamber heated up. Fits which were falling into the collecting vessel have reached up to 80°C. For temperature sensitive samples, the grinding chamber should not been filled to the maximum to lower the temperature.
In case that the shaft of the engine will heat up during constant grinding, we recommend checking its temperature every 30 minutes and interrupt, when > 80 °C might get reached (so bearings will not suffer). We are guessing that it might take very long until such temperatures will be reached.
With a second sample, we used a gap setting of 0,3 mm to grind the complete amount of sample. It took 25 minutes until the grinding chamber has been emptied. Temperature was not a problem with this gap setting or higher.
A third grinding trial with a gap setting of 0,5 mm could be ground within 17 minutes. For all 3 trials, a grinding of higher amounts will be possible.
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