Due to the manufacture tolerances in pressing and machining of the magnets, the geometrical axle and magnetizing axle of the magnet usually are not parallel, but differ from each other with a certain angle. This is called angle deviation.
HPMG can quarantee an angle deviation less than 5 degrees for sintered NdFeB magnets and less than 3 degrees for SmCo without control. If higher accuracy is needed, magnets need to be controlled by angle deviation measuring device. Angle deviation < 1 degrees is not possible due to measuring accuracy.
It’s to be noted that due to mechanical tolerances achivieng small angle deviation gets increasingly difficult with the decreasing size of the magnet.