10/主驱动

    Main drive

蜗轮材料选用优质耐磨合金铜，由精密机床加工，高级技师精细刮削而成，磨损极小，精度高。曲轴，用铬钢高频淬火处理，使用寿命长。摆杆由球磨铸铁铸造而成，强度高，耐磨耐用。

Worm gear material selection of high quality wear resistant alloy copper, from precision  machine tool processing, senior technician fine scraping,wear a very small, high precision. Crankshaft steel with high frequency quenching, long service life. Pendulum polished cast by the cast iron, high strength, wear and durable.