Calculation method of paper opening amount of bottom box (in MM), taking vertical pit as an example (that is, the box height is in the same direction as the pit line)
Pit height = height+width+(width /2)+20/30 (buckle length, small box 20, large box 30)+ 15/30 (lid tongue, small 15, large 30).
Paper mouth length = (length+width) *2+20/30 (mouth sticking position, small box 20, large box 30)
This is the full size of this knife. In fact, you need to add flash on four sides, about 8MM, and these sticky mouths, buckles and tongues should be adjusted according to the actual situation. The size of the paper is written in front according to international practice.
Millimeter to inch divided by 24.5.