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All of the raised panels I've ever made have had flat slopes, but the sawbuck's are concave (cove profile).
If you don't have a moulding plane that matches the cove's shape (raising hand) and believe it's too dangerous a task to be performed on a table saw (raising both hands), then you need to get resourceful.
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It's all about stock removal. How you achieve it depends on the tools you have and your personal preference.
The top edge of the slopes sits a bit lower than the decorative field, so I reached for a tool I'd never used before, a Record 043, to define the depth of the recess and the width of the slopes.
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Even though I spent time sharpening the Record's blade and flattening the fence and depth stop, it worked very poorly—tearing up the wood like kids unwrapping Christmas gifts. It w
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So I employed my Sargent combination plane, which worked superbly.
From there, a block plane, moulding plane, rasp, scraper, and sanding block finished the profile. Some of these steps could have been skipped, but I was figuring this out as I went along.
I'm sure there are a number of other ways to create a cove so feel free to share your own creative methods.