... machineFeatures:*Model: STM-41680*Max tested grinding wheel diameter: 400mm*Max rotary speed: 31000RPM* ... kgs)Main shaft wheel diameter (mm)Grinding wheel typeGrinding wheel outer diameterGrinding wheel hole diameter (mm)Grinding wheel Thickness (mm) ... , 321~10≤80m/s, ≤2 times T27 T29 Flat wheel, flap disc100-18016, 22, 25, 321-3.2 ... /s, ≤1.88 times 120002.5Φ63T41(Flat disc)250-40025, 25.4, 322.5- ...