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The first method of table saw cove-cutting employs two boards set across the blade that act as guides for the board being cut. Adjust the angle of the cove by adjusting the height and angle of the guides.
With an 1/8" blade set into the saw, use the two guides to run the board at an oblique angle. Push toward the blade to avoid kickback. Cut slowly, making several passes. Raise the blade 1/16" every time you make a pass. This method creates rough edges on the board from the teeth of the blade. Sand the board after the cut is complete.
A dedicated tool for cutting coves (Image 1) on a table saw works much like a shaper blade. The cove-cutting shaper blade makes the cut more smoothly than a regular table saw blade (Image 2).
Use the cove-cutting shaper blade the same as a regular blade. Set the two guides to the angle required and run the board slowly across the blade, raising the blade slightly each time a pass is made.