Rather 50.8mm x 101.6 mm...
mm measurements have long since replaced inches... But because some still talk about inches, the nearest mm size applies. That is, 2"x4" gives 45x95... However, if you buy rough-sawn timber, it tends to be 50x100, which is more similar to your 2"x4".
mm measurements have long since replaced inches... But because some still talk about inches, the nearest mm size applies. That is, 2"x4" gives 45x95... However, if you buy rough-sawn timber, it tends to be 50x100, which is more similar to your 2"x4".
From the saw, a plank is cut at about 2"x4", approximately 50x100 mm. Then around 2.5 mm is removed from each side during planing. But it's usually said that the timber is planed to dimensions of 45x95.Alexej said:
Similarly, a 2"x8" becomes about 50mm x 200mm, which after planing becomes 5mm smaller both ways, i.e., 45x195.
Get out the calculator! 5 mm, not 0.5.Alexej said:
Regarding inches, it's important to understand that this measurement has varied greatly between different times and places. It actually wasn't until the early 1900s that C.E Johansson determined an inch to be exactly 25.4 mm. Parallel to this system, Sweden has used verktum, which is slightly smaller than the English inch. But as mentioned, there are many definitions of an inch.
My late Grandfather, who was a carpenter early in life, claimed that there were different inches all the way from the sawmill to the finely planed timber, and in this way, a 2 by 4 always remained a 2 by 4 whether it was just rough sawn or later finely planed.
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