Reply by paratrooper34

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Posted on Short Scrub vs. longer Jack/Fore?

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915 posts in 2947 days

#1 posted 12-12-2012 09:39 PM

12strings, as I mentioned, I have (had) a cupped board that I needed to get flat for a project. This is how I got it done:

Here is the board on my bench. I made a couple of passes with a jointer plane to show how it is cupped. The concave side is up. I do this side first because the jointer will ride the high spots on the side until the surface is on the same plane all the way across. You will notice the board is held by the end vise with wedges placed under the board to prevent rocking while I plane it.

You can see that the jointer did the job in removing the high sides and leveling it out. I wanted to go down just a little bit more after the jointer. With the side flat, I could use the jack plane to bring it down to where I wanted. Last thing to do was check with winding sticks to ensure there was no twist in the board.

After that, I got the edges somewhat cleaned up so I could use a marking gauge to mark the thickness I wanted along the entire perimeter of the board. This mark acts as a reference point for when removing the convex part of the other side and down to the final thickness.

I started on the convex side by removing the high middle with a scrub plane. By doing this, the two sides of the board would register the jointer to get this face flat before final thicknessing. Jack planes can do some good hogging out, but they cannot beat an effortless, full 1/8” shaving of a scrub plane. This took a total of about ten strokes.

I then used the jointer plane same way as the other side. I got it relatively flat so I could start thicknessing.

I used the scrub plane again to get the thickness almost to where it needed to be and cleaned it up with the jointer.

Last thing to check was twist. My winding sticks are extruded aluminum angle stock.

So I used three planes to get a pretty badly cupped board straight and flat. Now I am ready to cut it up and put into a project. Hopefully seeing pictures with descriptions helps you with your work.

Good Luck!

-- Mike

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