What many of us naturally assume to be a "no brainer" when rounding numbers is apparently not so - and can also be wrong. Apparently "pure" engineering has different rules for rounding up/down than what we learned growing up and apply in other areas of life.
One of our Company users recently had a dimension of xxx.25 that he wanted to be a one place dimension on the drafting side. When switching it to a one place, the value went to xxx.2 and NOT to xxx.3 as expected. After I duplicated the problem on my laptop and contacted GTAC about the issue, they replied to me with the IR (Incident Report) email below. I'm including the report in its entirity, but have copied and pasted the relevant information to be immediately below and bold. I was told that there is no toggle for which way the numbers get rounded and the methodology is hard programmed into the UG code this way to be compliant with the appropriate ANSI and ISO engineering standards. The suggested solutions for rounding xxx.25 to a one place dimension of xxx.3 were to either change the model appropriately or consult with the engineer about these engineering rules and move forward from there based on the design intent of the component in question.作者: jg一号 时间: 2005-1-6 14:43
其实在零件测绘的时候有一种说法，叫做四舍六入五单双。什么意思呢？前面大家都知道，就说说五单双把，如果小数点取2位，就看第3位。第2位是奇数就入，反之，就舍。作者: XIAO002 时间: 2009-4-28 08:55
有此等事??
