TAPS- 絲攻下孔徑
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.
Because the minor diameter of the internal thread is equal to the drill hole diameter, the drill diameter is calculated using the following formula.
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H1=M係U係螺紋/metric&unifiedthread 0.5413P |
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W係螺紋/whitworhthread 0.6403P |
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SM係螺紋/sewingmachinesthread 0.6495P |
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管用螺紋(RC,RP,G,PT,PS,PF)/pipethread 0.6403P |
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P =螺距pitch |