(A)Less running friction to save power; (B)The excellent linearity of blade frame can have good cutting quality and more slab; (C)Be more suitable to use very thin blade and get thin slab; (D)The low starting power can reduce impact force to the power system; (E)Less fluctuation of current can prolong the motor's life; (F)Adopts mechanical protection device with screw rod to avoid damage the frame top; (G)Adopts PLC and monitor panel control system for easy operating. The monitor panel can supervise the machine performance status as well as the trouble alarm; (H)Adopts power cut-off protection system to avoid the machine malfunction.