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Reply by brtech

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Posted on Thickness Planer or Joiner?

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brtech

664 posts in 1556 days


#1 posted 1428 days ago

A jointer makes a flat face where there wasn’t one, and doesn’t reference off any other face to do so
A jointer can also make a flat face exactly 90 degrees to another flat face, but it can’t make a flat face parallel to another flat face

A table saw can be used to make a flat face parallel to another flat face as long as there are two flat faces at 90 degrees on the board already (using the fence and the table saw surface against the reference), within the limits of the diameter of the blade and safety for the tool. It can also make a flat face 90 degrees to another flat face (using the table saw surface against the reference), again within limits.

A thickness planner can make a flat face parallel to another flat face, but it needs that first flat face to work.

To get a rectangular board with 90 degree faces, you start with a jointer to get one flat face (bottom), rotate it to get another flat face (side) 90 degrees to that. Then you go to a planer to make the top flat, and parallel to the bottom. You then typically use a table saw to make the other side. You could do that with a planer or a jointer, but usually it makes more sense to do it with a table saw

You can’t start with the planer or the table saw, because they need a flat reference.

That tells you that your first tool is a jointer, but actually, using a table saw to get the top parallel to the bottom only works for roughly square boards less than 3-5”, so you really need both.

You can start with a planer, but you then have to get boards with at least one face surfaced.


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