Double Column Grinding Machines Joen Lih Double Column Surface Grinding Machine JL-20200-CNC Grinding Area: 230 x 2250 mm X & Y & Z: Servo Explore Joen Lih Double Column Surface Grinding Machine JL-20400-CNC Grinding Area: 230 x 4250 mm X & Y & Z: Servo Explore Joen Lih Double Column Surface Grinding Machine JL-30200-CNC Grinding Area: 400 x 3100 mm X & Y & Z:Servo Explore Joen Lih Double Column Surface Grinding Machine JL-50400-CNC Grinding Area: 400 x 4875 mm X & Y & Z:Servo Explore