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一、挤牙丝攻内孔径计算公式：-
公式：牙外径－1/2×牙距-
例1：公式：M3×0.5＝3－(1/2×0.5)＝2.75mm-
M6×1.0＝6－(1/2×1.0)＝5.5mm-
例2：公式：M3×0.5＝3－(0.5÷2)＝2.75mm-
M6×1.0＝6－(1.0÷2)＝5.5mm-
二、一般英制丝攻之换算公式：-
1英寸=25.4mm（代码）-
例1：（1/4-30）-
1/4×25.4＝6.35(牙径)-
25.4÷30＝0.846(牙距)-
则1/4-30换算成公制牙应为：M6.35×0.846-
例2：（3/16-32）-
3/16×25.4＝4.76(牙径)-
25.4÷32＝0.79(牙距)-
则3/16-32换算成公制牙应为：M4.76×0.79-
三、一般英制牙换算成公制牙的公式：-
分子÷分母×25.4＝牙外径（同上）-
例1：(3/8-24)-
3÷8×25.4＝9.525(牙外径)-
25.4÷24＝1.058(公制牙距)-
则3/8-24换算成公制牙应为：***.525×1.058-
四、美制牙换算公制牙公式：-
例：6-32-
6-32 (0.06+0.013)/代码×6＝0.138-
0.138×25.4＝3.505（牙外径）-
25.4÷32＝0.635（牙距）-
那么6-32换算成公制牙应为：M3.505×0.635-
1、 孔内径计算公式：-
牙外径－1/2×牙距则应为：-
M3.505－1/2×0.635＝3.19-
那么6-32他内孔径应为3.19-
2、挤压丝攻内孔算法：-
下孔径简易计算公式1：-
牙外径－（牙距×0.4250.475）/代码＝下孔径-
例1：M6×1.0-
M6－(1.0×0.425)＝5.575（***大下孔径）-
M6－（1.0×0.475）＝5.525(***小)-
例2：切削丝攻下孔内径简易计算公式：-
M6－(1.0×0.85)＝5.15（***大）-
M6－(1.0×0.95)＝5.05(***小)-
M6－（牙距×0.860.96）/代码＝下孔径-
例3：M6×1.0＝6－1.0＝5.0+0.05＝5.05-
五、压牙外径计算简易公式：-
1．直径－0.01×0.645×牙距（需通规通止规止）-
例1：M3×0.5＝3－0.01×0.645×0.5＝2.58(外径)-
例2：M6×1.0＝6－0.1×0.645×1.0＝5.25(外径)-
六、公制牙滚造径计算公式：（饱牙计算）-
例1：M3×0.5＝3－0.6495×0.5＝2.68(车削前外径)-
例2：M6×1.0＝6－0.6495×1.0＝5.35(车削前外径)-
七、压花外径深度（外径）-
外径÷25.4×花齿距＝压花前外径-
例：4.1÷25.4×0.8(花距)＝0.13 压花深度应为0.13-
八、多边形材料之对角换算公式：-
1．四角形：对边径×1.414＝对角径-
2．五角形：对边径×1.2361＝对角径-
3．六角形：对边直径×1.1547＝对角直径-
公式2： 1．四角：对边径÷0.71＝对角径-
2．六角：对边径÷0.866＝对角径-
九、刀具厚度（切刀）：
切断刀宽度
约等于（05.～0.6）√D
十、锥度的计算公式：-
公式1：（大头直径－小头直径）÷（2×锥度的总长）＝斜角值
查三角函数值-
公式2：近似计算公式（度数在≤6°以内）
（大头直径－小头直径）÷总长×28.7＝度数
十一、车螺纹转速选择：
速度=1200／螺距-安全数值（建议值80）
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