ACER Group Homepage - Surface Grinders [Supra-618] Push button manual starter with overload protection. Distance between Double-V is 19.6" apart. The width of machine base is 22". FC 25 machine base weighs more than Downloads-Quotations · Surface Grinders · Supra-618 II · Supra-618 Specification SG-618 | Sharp Industries One "V" and one flat way for longitudinal travel; both ways are hand-scraped and covered with Turcite B coating. Lead screws are hardened and ground for durability.