Grinding machine Adopt the exceeding precise class7(P4 level) ball bearing ... the exceeding precise class7(P4 level) ball bearing for spindle.2,Bring transmission by synchronous belt, operating simple and convenient. ... -233-23Cross Feed On Handwheelmm0.02/Graduation 2.5/revolution 0.02/Graduation 2.5/revolution Vertical Feed On Handwheelmm0.01 ... Gross,NetTO.80, 0.70O.85, 0.75 grinding machine M820