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在本刊第6卷第2期內徐心逸同志的‘聯結零件的孔間公差’一文,詳盡地討論了各種不同情况孔间公差的問題;但在工作時我們常会遇到下列情况:工作物上有兩孔,如[圖一]所示,兩孔的中心距離为L,其公差為△L,座標尺寸為x、y。关於座標尺寸是否需要标註公差及如何確定其公差等問題,在該文中未曾提及,今愿作如下補充:(1)首先应该肯定:孔的座標尺寸要標註公差,决不能按自由公差來處理。為了欲得到最高級的孔中心間距離精度,我們常在特種座標鑽床上按直角座標系統進行鑽孔或鏜孔;而在這些特种座標
In his article, Vol. 6, No. 2, Comrade Xu Xinyi’s article entitled “Hole Tolerances for Joint Parts” discusses in detail the issue of tolerances between holes in different situations. However, we often encounter the following situations during work: There are two holes, as shown in [Figure 1], the center distance of the two holes is L, the tolerance is △ L, the coordinate size is x, y. As for whether the dimensions of the coordinates need to be marked with tolerances and how to determine their tolerances, which are not mentioned in the article, the following are intended to be added as follows: (1) First of all, it should be affirmed that the coordinates of the holes should be marked with tolerances and must not by free tolerance deal with. In order to get the most advanced hole center distance accuracy, we often drilling or boring on a special coordinate drilling machine according to a Cartesian coordinate system; and in these special coordinates