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Reply by Boardman

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Posted on Jointer Problem

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Boardman

157 posts in 4369 days


#1 posted 04-27-2009 02:31 PM

For the life of me I can’t imagine how the table height on a jointer sitting idle for a few months could change all by itself. Or even a jointer used daily. The tables on a jointer are attached so securely that you could probably drop it from 10’ and not affect the table settings. But it seems that’s almost always blamed for jointing “problems.”

Azor – you mentioned the sides of the board are parallel, but didn’t say if there’s a bow in it. Sight down the length of the edge to see if there is. A bowed board should always be jointed with the concave side down. That way you’ll end up with it hitting the knives on both the leading and trailing ends, with no contact in the middle. DON’T put so much pressure on it that the center hits also. Use just enough pressure to keep it from hopping when it hits the knives. Each pass will take more off both the leading and trailing ends unti it eventually hits the knives in the middle too.

If you try jointing the convex side you’ll end up taking down only the leading end. Draw a “smile” on a piece of paper and you can envision how that would happen.


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