PC Board

The board uses to be equipped with a metal frame of ~1mm thickness and a VGA socket which has massive supportive screws beneath. Those kind of metal parts might be able to damage the knives or inserts. We recommend removing parts like this before grinding.

The remaining board should be split in < 7x11 cm pieces for feeding to the machine.

After 30s of grinding, we interrupted the grinding process and checked the inside of the grinding chamber. It has shown that the biggest board piece has been flexible enough to lie on top of the sieve and in front of the third fixed knife. Electronic components have been removed from the surface, but the board itself stayed mainly intact.

Therefore, we took out the board and broke it into pieces < 5cm (which can been fed directly to the Universal Cutting Mill PULVERISETTE 19 too). Afterwards, we fed the board pieces again. After totally 1 minute, all pieces have been crushed successfully. Only a minimal residue inside of the grinding chamber is left. These pieces can be brushed off and used for further grinding as well. Fewer residues might be found when a 10mm square perforated sieve cassette might be used.

The sample from the pre grinding step in result 1 has been used for this trial. All sample has been fed to the standard funnel for long and bulk solids, to minimize dust exposure, we recommend using the protected funnel with sample pusher.

After 1 minute, all sample has been ground. Only minimal residue is left inside the grinding chamber. Even higher amounts can be ground without problems.

50g of the ground sample from result 2 have been used to demonstrate that even smaller fineness’s can be achieved 0,25mm is the smallest available sieve cassette. Also 0,75mm and 0,5mm are available for faster grinding.

The start size has been < 1mm. Particles <30mm can be fed direct with our standard funnel; pieces < 5cm should be fed with the protected funnel. After the first 2 minutes of grinding, an output of 37g has been achieved. Within the last 3 minutes of grinding (totally 5 mintues), the output rose to 46,7g.

After 5 minutes, only minimal residue has been found inside the grinding chamber.

Even higher amounts can be ground without problems.