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奇数槽丝锥中径尺寸的测量颇为麻烦,用沟槽千分尺测量,操作简单,准确可靠。方法: 在沟槽千分尺上,用一根恰当直径的钢针,放入螺纹牙形槽内(如图),量出直径m和丝锥外径d_0,按下式可算出丝锥中径实际尺寸d中。d中=m-d(1+1/sina/2)+S/2ctga/2+m-d_o/sinβ/2式中:a为螺纹牙形角;s为螺距;d为恰当钢针直径;β为千分尺砧座之夹角,并由下式计算:
Odd slot taps diameter size measurement is quite troublesome, with groove micrometer measurement, simple operation, accurate and reliable. Methods: On the groove micrometer, use an appropriate diameter steel needle into the thread groove (figure), measure the diameter m and tap diameter d_0, according to the following formula can calculate the tap diameter actual size d in. d = md 1 + 1 / sina / 2 + S / 2ctga / 2 + m-d_o / sin β / 2 where a is the thread profile angle, s is the pitch, d is the diameter of the correct needle, Micrometer anvil angle, and by the following formula: