Reply by knotscott

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Posted on A question: what is the difference between a Jointer and a Jointer/Planer?

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8056 posts in 3400 days

#1 posted 01-19-2013 10:30 PM

Two different tools, with different primary functions, though there are some similarities. The jointer’s primary job is to flatten a reference face, and then an adjacent 90° edge to that face…..everything other aspect of dimensioning lumber references to that flat face and squared edge.

A planer essentially makes the opposite face parallel to the bottom face, and produces a consistent thickness across the length of a board…note that it doesn’t flatten a board per se…a board that’s twisted will come out twisted, but thinner. A planer needs a flat board face to reference from so it it can make that opposite face parallel to the reference face. With the help of a planer sled to substitute as a reference face, a planer can be coaxed into flattening an opposite face.

It’s worth noting that some people skip the flattening of a face and do edge jointing using a table saw or a router, but without a reference face, the ensuing 90° edge isn’t uniformly 90° to the entire face….it’s random.

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