TAPS- 丝攻下孔径

內螺紋下孔徑之加工必須思考咬合率的問題,因為下孔徑等同內螺紋的內徑,因此 依螺距、牙山高度、螺紋基準外徑如下列公式計算出下孔徑及咬合率。
Because the minor diameter of the internal thread is equal to the drill hole diameter, the drill diameter is calculated using the following formula.




table06.jpg





H1=M係U係螺紋/metric&unifiedthread                   0.5413P

W係螺紋/whitworhthread                                          0.6403P

SM係螺紋/sewingmachinesthread                             0.6495P

管用螺紋(RC,RP,G,PT,PS,PF)/pipethread                   0.6403P

P =螺距pitch