我厂在制造螺距0.5公厘及0.5公厘以下的丝锥和螺纹样柱时,由于螺距很小,所磨螺纹尖底平面一般需达到0.02公厘左右的要求,由于底径的限制,用500粒度以上的专用砂轮,有时还达不到要求,如用500粒度以下砂轮磨削螺纹,其尖端极易磨损,必须经常进行修正。在砂轮磨损后就不能保证图纸 I plant in the manufacture of pitch 0.5 mm and 0.5 mm below the tap and thread-like column, due to the small pitch, the tip of the thread worn flat surface generally required to reach 0.02 mm around the requirements, due to the bottom diameter of the limit, with 500 Above the granularity of the special wheel, and sometimes not meet the requirements, such as grinding with 500 grains below the grinding thread, the tip is extremely easy to wear, must be regularly amended. After the wheel wear can not guarantee the drawings