Once all the tenons are finished, you will need to cut a groove along the inside face of the rails to accommodate the wood buttons that will secure the tabletop in place. Leave the dado head on your table saw, adjust its width to % inch, and set the cutting height at about % inch. Position the fence about % inch from the blades. Feed the rails into the dado head inside-face down and with the top edge pressed against the fence (left). Also cut a groove in the end rail blank at this time. This will ensure that all the grooves are identical. (Caution: Blade guard removed for clarity.)
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