Reply by lwllms

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Posted on Short Scrub vs. longer Jack/Fore?

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555 posts in 3251 days

#1 posted 12-11-2012 01:13 AM

Now to answer the original post, when preparing stock a scrub plane can often cause problems. Hand “thicknessing” traditionally rendered 7/8” thick stock from 4/4 material. Stock preparation was called “thicknessing” because the goal is to produce true stock to a uniform thickness and that’s the difficult part.

You don’t want to remove too much material from the first or reference face because you won’t have enough thickness left to get the desired end thickness. Stanley or Continental style scrub planes are too aggressive. You’ll actually remove as much stock with a jack or fore plane but the depth of cut isn’t as dramatic. With a jack or fore plane you’re removing material over a wider area and this gives you a more controlled flatting of the face. Control is important here if you want to end up with your material of uniform thickness. Of coarse you could always just start with thicker stock but that costs money and means you have to do a lot more work.

I used to try to justify using a scrub plane by saying it was good for localized problems but my business partner always insisted he wouldn’t want to put material in a project that moved so dramatically that a scrub was required. He’s right, this kind of distortion during drying always means residual stress remains after thicknessing and the material is likely to move again.

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