Control of the quality of the abrasive used in the process. The most important test is a sieve analysis to determine a change in the grain composition depending on the abrasive flows.
After the sample has been filled in on the feed side, the testing machine is switched on and the sample is subjected to a first series of runs. The number of loads is preselected depending on the type of abrasive to be tested.
The sample is then taken from the testing machine and subjected to a sieve analysis. At the same time, the remaining total weight is also determined in order to determine the loss due to suction.
The grain fractions remaining after the sieve analysis that are above the target grain size are mixed with one another and returned to the testing machine. This is followed by a new series of runs and a sieve analysis follows after each series of loads. The process is repeated again and again until the final state defined according to the selected test method is reached.
The result is the wear resistance Z, the number ZN50 indicating the number of passes required until the sieve analysis only determines 50% of the original nominal grain fraction.