When making a frame for frame-and-panel construction, an easy way to mill centered grooves in a piece of solid wood is to run the piece through the table saw on edge and then flip it end for end and run it again.

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This technique is commonly used to mill centered grooves in a piece of solid wood for frame-and-panel construction. Running the piece through the table saw on edge creates one side of the groove, and flipping it end for end and running it again creates the other side of the groove, resulting in a centered groove.

When Making a Frame for Frame-And-Panel Construction, an Easy Way