... backing, rings with drag ,the popular style is two-speed electric - driven, A is variable-frequency electromotor plus inverter ... the amount of unbalance ,phase and real-time rotational speed, bases have adopted the overall foundry, stability is good ... (kg)Max.diameter of workpiece mmDistance between two bearing suppo mmMax.rotorDiametermmBalanncing speed min r/mmmin. achievableresidualun balance(g.mm ...