STUDER S30 LEAN PRO CNC Cylindrical Grinder 1999 3 Wheel Design ID Spindle. Manufacturer: Studer; Model: S30; USED STUDER S30 LEAN PRO CNC Cylindrical Grinder 1999 3 Wheel Design ID Spindle Price: $49,500.00 Product Details: Center Height 6.875 Distance Between Centers 39.4 ID Spindle Diameter 4 ID Spindle Speed 20,00