So the joiner doesn't actually join? It doesn't put stuff together? It makes it square because your running the material on each side along the fence?
Its called a jointer cause it makes one side flat so you can make a "joint". The jointer cuts a certain amount every pass. If you used only a jointer the boards would all be different thickness.
The planer mills boards to exact thickness cutting one face of the board to match the other so they are in the same "plane". The planer doesn't make things flat it makes the top side match the bottom.
Okay, I get the joiner part now. But that planer explanation... I don't get that one. I see what it's doing and I think it is making stuff flat. I don't understand "matching" the bottom.
If a board is warped and it goes through a planer it will still be warped. It needs one flat side on the bottom in order to work. It's using the boards flat bottom to guide it. If the bottom side is not flat It will make the top not flat.
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