the second problem is the thickness of the wood.
in Holland we have the plywood thickness: 3.6, 5.5, 9, 12, 15, 18, 22, 25
and MDF: 6, 8, 10, 12, 16, 18, 22, 25, 28
The most common sizes of plywood sold in the United States are 3/4", 1/2" and 1/4".
However, that's not exactly correct.
A 3/4" sheet of plywood is really 23/32" (and is now typically labeled as such).
Similarly, 1/2" should be correctly labeled as 15/32" and 1/4" labeled as 7/32".
inch | */32 | mm |
1/1 = | 25,40 = | 25.40 |
3/4 = | 18,25 = | 19,05 |
1/2 = | 11,90 = | 12.70 |
1/4 = | 5,50 = | 6.35 |
so quit a challenge to convert a pattern were you put pieces together.