· With six arms in grinding, skew side trimming, polishing
& chamfering operation at the same time
· Skew side ground are glossy & without joint
· Any portion of periphery can be taken at will for grinding
· Grinding arns increase & decrease the pressure automatically
in ascent & decline
· Grinding long & short sides ratio: Ellipse 3:1、 Shape of athletic
ground 2.5:1、 Chamfered rectangle 2:1