系列图,似古钟,口朝西(左),头位东(右); 上放孔,下方轴,两零线,穿其中。定偏差,握要领,距零线,最为近; H基准,值为零,孔正负,轴负正; 取正值,下偏差,取负值,上偏差; 细领会,详记清,J例外,查表定; 最特殊,J_s IT定,与零线,恰对称。这里是指确定基本偏差。口诀中只写了H、J和J_S表示孔基本偏差代号的字母,应理解还包括轴的情况,即:H→H(h);J→J(j)和J_s→J_s(j_s)。该“口诀”可帮助我们结合系列图形象地掌握孔、轴基本偏差系列的一般规 Series of figures, like ancient bell, mouth west (left), head east (right); put hole, the lower shaft, two zero lines, wear them. Set deviation, grip essentials, from the zero line, the most recent; H benchmark, the value is zero, the hole positive and negative, positive axis; take positive value, the next deviation, take a negative value, the deviation; Exceptions, check the table set; the most special, J_s IT set, and zero line, just symmetrical. Here is to determine the basic deviation. In the formulas, only H, J and J_S are used to represent the letters of basic hole deviation codes. It should be understood that the axis condition is also included: H → H (h); J → J (j) and J_s → J_s (j_s). The “formulas” can help us with the series of graphic images to master the hole, the basic deviation of the axis of the general rules