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钳工用丝锥加工螺纹孔时,因没有夹具,很难保证螺纹孔与端面的垂直。为了避免这个偏差,可以做一个很简单的夹具,如图所示,1是三个支柱,2是导套, 3是扳手。扳手可以在导套的内孔中转动和上下移动。扳手与导套配合表面的公差可以按db加工。三个支柱互成12°。支柱与导套底面的连接,可以是焊在一起的,也可以用螺纹连接在一起,但是要保证三根支柱所决定的基准平面与导套的内孔垂直。
Fitter tap hole processing, because there is no fixture, it is difficult to ensure the vertical screw hole and the end face. To avoid this deviation, you can make a very simple fixture, as shown in the figure, 1 is the three pillars, 2 is the guide sleeve, 3 is the wrench. The wrench can be turned and moved up and down in the bore of the guide sleeve. Wrench and guide sleeve with the tolerance of the surface can be processed by db. The three pillars are each 12 °. The connection between the pillar and the bottom of the guide sleeve can be welded together or screwed together. However, it is necessary to ensure that the reference plane determined by the three posts is perpendicular to the inner hole of the guide sleeve.