带孔工件的键槽,一般用划线盘划线很难精确,而且效率很低。我厂工人改进一付划键槽用的工具,效果却很好。这付工具由两种零件组成:1本体,2T形尺。本体1和T形尺2都需要加工得非常精确。本体的四个面要互相垂直。A部的端面要居于Б体两棱的中心,并且同它平行, Keyhole with a hole in the workpiece, generally difficult to use crossed scribing difficult, and low efficiency. I plant workers to improve a row keyway with the tool, the effect is very good. This pay tool consists of two parts: a body, 2T-shaped ruler. Body 1 and T ruler 2 need to be processed very accurately. The four sides of the body should be perpendicular to each other. A part of the end to live in two body B center, and with it parallel,