一般箱体工件上都有较多的孔,这些孔在加工时,如果不能用夹具,那末每个孔就需要划两条中心线和四条加工的看线。每条线到基线或到另一条线都有一定的距离,这些距离往往又不是整数,所以用一般的方法来划这些线,既浪费时间又不容易准确。苏朕工人在划箱体工件上的线时,采用了一种新的划线方法,就是屏板划线法。利用这种方法,可以提高划线工作的效率,并可避免产生差错。附图就是屏板划线的实际例子。 General box workpiece has more holes, these holes in the processing, if you can not use the fixture, then each hole you need to draw two centerlines and four processing of the line of sight. Each line to the baseline or to another line has a certain distance, these distances are often not an integer, so the general method to draw these lines, not only a waste of time and not easy to accurate. When workers in the zoned box skimmed the workers, a new method of scribing was adopted, which was the screen scribing method. Using this method, you can increase the efficiency of scribing work, and avoid errors. The picture is a practical example of screen scribing.