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I want to practice on my Incra and thought I'd make some basic boxes to house an inwall rectangle speaker (until I get the time to fish and crawl in the attic :thumbdown: )

My question: If the box is to be say 5"x7" and I want to make 1/4" box joints, do I add 1/4" to the initial cut lengths of the sides? In my mind if I box jointed the 5x7 it would cut the inside area down the depth of the bit or joint right?
 

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You typically measure the outside of boxes to get your cut length. With box joints or through dovetails, you cut your stock to the same length as the outside of the finished box.

If you are measuring the inside of the box, then yes, you would add the thickness of the stock.

The size of the box joint is irrelevant, it is the thickness of the stock that you are concerned with. Also remember that many box joints are cut so that the fingers are proud of the surface to allow for flush sanding and you may need to take that into account depending on how tight your tolerances are.
 
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