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齿轮加工计算挂轮比时,经常碰到一些多位小数的连乘。例如在Y38滚齿机上加工一个7级精度的斜齿轮,必须精确到小数点后第五位,才能保证工件的精度。而检验多位小数相乘结果,又很繁琐。下面介绍一种快速判别法——弃九法。例如:检验187.5364×0.7854=147.29108856,可分以下几步进行。 (1)用被乘数中各位数字的和,减去其所包含的9,或9的倍数,得到一个小于9的差数α: 1+8+7+5+3+6+4=34;α=34-3×9=7
Gear processing calculation When the ratio of hanging round, often encounter some number of decimal multiplication. For example, in Y38 hobbing machine processing a 7-level precision helical gear, you must be accurate to the fifth decimal place, in order to ensure the accuracy of the workpiece. The test of multiplying the decimal result, it is cumbersome. Here is a quick discriminant - abandoned nine law. For example: test 187.5364 × 0.7854 = 147.29108856, can be divided into the following steps. (1) Using the sum of the digits in the multiplicand, subtracting the multiple of 9, or 9 it contains, a difference of less than 9 is obtained. Α: 1 + 8 + 7 + 5 + 3 + 6 + 4 = 34 ; α = 34-3 × 9 = 7