大凡从厚度四十有四日,二十四日,谓之薄板。
一,薄板一,薄板一。
百舍冲压,小隙则薄板开,裂者易合,厚度小,裂者益小,所抵者益小;
二铁性大,而薄者易变于五金冲压,压讫,故形大如回弹,厚度薄,面与正度高,所出五金冲形相稳。
三曰:薄者有缝,冲者有精,模柱连衡,至于六,以游导之具为固,冥板二十。
百有七,厚板平者,更有冲隙;
二十二曰:五金冲形,厚度曰正,冲床为力,大紧相厚,板翦胜薄板。
三两、冲压之度,外治之功,得于厚矣。
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