Hand planing a big cup…
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9 December 2015 at 5:30 am #133007
2 cm? Holy mackerel! If you must use this board, then follow Richard McGuire’s (The English Woodworker) advise. I saw this from a snippet of one of his videos.
With the concave side up, plane the two high spots down the length of the board to get you close to removing the cup. Richard says that there is a lot of wasted energy when planing transverse as the blade only touches the board at the beginning and end of the stroke until the cup is removed. You can use far fewer strokes by planing the high sides first. Then when the cup is mostly gone, you can go transverse to be sure the cup is gone.
You may need to shim the underside of the board on both sides so that it doesn’t rock too much while planing.
I really enjoyed Richard explanation on efficiency of planing with the grain and what he says make sense but i have a doubt here: when plane the concave side of my board, the plane will not stay parallel with workbench top wich is flat. My plane will stay sloped to the cup, one plane side higher toward board’ side, the other plane side will stay lower because it’s near the center…So does planing a cup with the grain really work?
9 December 2015 at 1:13 pm #133015Hello @bow: For me the short answer is yes. I know that theoretically what you are saying is correct and it’s the theory that is creating the doubt in your mind. In practice, by placing a little emphasis on the left side of the plane as you advance you will take a deeper shaving from the board edge and while the first pass may only create a narrow shaving, that is what you want to start forming a ‘flat spot’ which will widen as you take more passes. Take about five passes and put a square or straight-edge across the board to check your progress.
I know the theory seems against it bow but give it a go. Or better still, if you’re that concerned, try it on a cupped off-cut, or if you can spare it, cut a short length off the board and experiment with that first.
You are right @scottchensoda : i discovered it today while planing a small cup on a pine board. I pushed the plane with the grain usinga tecnique generraly used for flattening an edge..i skewed the plane toward the higher point. That make a difference probably because the sole is partially registered on the bottom of the U shape… Now i have to solve another plane issue, but i ‘m starting another thread. Thanks!!!
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