五　螺丝样板之制造 螺丝样板为精密制造工作之一,螺丝样柱因螺纹精度较高,须用螺丝磨床来磨螺纹。至於螺丝样圈之制造,因在30公厘以内螺丝孔无法磨制,又因内螺丝无特殊之量具可以度量,祗能用螺丝对柱(螺丝样圈的样板),来测量内螺丝之各种尺寸,所以螺丝样圈之制造,比较困难。 I Five-screw model for the manufacture of screws One example of precision manufacturing, screw-type column due to higher thread accuracy, the screw grinder to wear thread. As for the manufacture of screw-like rings, the screw holes can not be ground within 30 mm and because there are no special measuring tools for the inner screw, only the screw pair (screw-like pattern) can be used to measure each of the inner screws Kind of size, so the manufacture of screw-like circle, more difficult. I