…(8) Method of writing dimensional tolerance limits When manufacturing an item, even if the diameter of a certain part is specified as 50 mm, it is impossible to actually finish it to an extremely accurate value of 50.000……mm, and in many cases there is no need to do so. Therefore, in practice, two appropriate maximum and minimum allowable dimensions (maximum and minimum allowable dimensions) are set so that the product fulfills its functions and is most advantageous in terms of processing, and the item can be finished within that size. The difference between the maximum and minimum allowable dimensions is called the dimensional tolerance, and to indicate this on a drawing, the following methods are used: writing the dimensional tolerance values slightly smaller and side-by-side next to the dimensional values indicating the standard dimensions (called reference dimensions), writing them side-by-side as the maximum and minimum allowable dimensions, or using the dimensional tolerance symbol (fit symbol). … *Some of the terminology that refers to "allowable limit dimensions" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…(8)寸法の許容限界記入方法 ある品物を製作する場合,例えばある部分の直径が50mmと指定してあったとしても,実際にそれを50.000……mmのようにきわめて正確に仕上げることは不可能であるし,また多くの場合その必要もない。したがって,実際には,その製品の機能を満たし,かつ加工上ももっとも有利なように,適当な大小二つの許容限界寸法(最大許容寸法および最小許容寸法)を定め,その間の大きさに品物が仕上がればよいようにしている。この最大・最小許容寸法の差を寸法許容差といい,これを図面上で指示するには,基準となる寸法(基準寸法という)を示す寸法数値の次に,寸法許容差の数値をやや小さく,上下に並べて書く方法,大小の許容限界寸法としてこれを上下に書く方法,寸法許容差の記号(はめあい記号)による方法などが用いられる。… ※「許容限界寸法」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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