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对于西安仪表厂1973年以前生产的EWY—103型圆图屯子电位差计,原配的玻璃记录笔尖损坏或丢失时,用以下办法可取得比较好的效果。即用26(1/2)的注射针头(根据记录的粗细可任意选择)经过加工代替玻璃笔尖。具体做法是:按附图所示的尺寸,沿虚线①锉掉或磨掉,沿虚线②剪掉。然后找一条直径稍小于针头大端内孔的铁条,放进内孔里,在砂轮上滚磨,以消除棱角,并使其大端外圆直径磨小到大约6毫米时为止,取下用焊锡将其大端内孔封闭,然后用锉刀锉掉焊锡面的1/3,以作为注射孔,并锉平小端的剪断面,最后以直径0.1毫米的钢丝在水笼头下边冲水边疏通,清洗掉锉
For Xi’an Instrument Factory EWY-103 type circular Tuntun Potentiometer before 1973, when the original glass record pen tip is damaged or lost, the following method can achieve better results. That is 26 (1/2) of the needle (according to the thickness of the record can be arbitrarily selected) in place of the glass pen tip. The specific approach is: according to the size shown in the figure, along the dotted line ① filed or worn away, cut along the dotted line ②. Then find a diameter slightly smaller than the needle end of the inner hole of the iron bar, into the hole, the grinding wheel grind to eliminate edges and corners, and its large diameter cylindrical wheel diameter down to about 6 mm, so remove Close the large end hole with solder and then file the 1/3 of the solder surface with a file to serve as the injection hole and file the end of the flat end with a small end and finally clear the edge of the tap with a diameter of 0.1 mm , Clean the file