This machine is used to grind the hemline(FA ,OG edge,round) of flat glass .two wheels for rough feed,two wheels for find feed,two wheels fro polishing.Rough feed,fine feed and polishing can be completed by one time process.it can be both operated by manual and by PLC(Programmable logic Controller) which can set the parameter in interface then start work automatically.It adopt the stepless motor adjust the speed,can change speed smoothly in a big range,easy operation.