I’m having difficulty jointing two boards where they perfectly mate when placed together. I use a Delta 6 inch variable speed. I am jointing 1″ cherry boards of various widths 6″ – 10″.
There is a very, very small bow in the middle which leaves a tiny gap. I can close it with clamp pressure. The gap is there even if I flip the boards.
But I have checked the jointer fence for square. It is. I have tested, examined and measured the flatness of the fixed and movable surfaces on the jointer. They are flat and parallel.
I don’t get it. I’ve adjusted my technique and fee rates. I can make the gap smaller but not totally disappear.
Any hints?
Bob
Replies
If the gap is in the middle, you might want to keep it. Some older jointers had a special feature to do this. It would help to reduce the likelihood of the joint opening up at the ends.
Most likely the root cause is knife height relative to the outfeed table. Check with a good straightedge and see if the knives just tick the straightedge.
Pete
Thanks Pete. The tiny gap is in the middle and symetrical. I'll let it go for now.
You and the other gentleman who answered showed me that I'm still a rookie. I am grateful for pro's like you guys.
We're all rookies at something. Knots' biggest value is when people can share their their individual expertise.
Pete
I try to have a tiny gap in the middle of the joint. That helps keep the ends from opening up. I'd say you got it right! If light clamp pressure closes the gap, then you are good to go. You don't want to see daylight at the ends of the board.
Dave
Thanks Spike. I thought that this was an indication of a problem but I guess that its OK.
Thanks for your Pro answer.
For what its worth, I find I get a cleaner glue line (almost invisible) if I run a hand plane along the gluing edges right after the jointer. I hand plane until I can get a fine, continuous ribbon shaving and no more.
This seems to remove the 'ripple' which is always associated with the rotating blades on a jointer. It will probably smooth out your bow as well.
Like I said, the glue line becomes almost invisible.
good point. I normally joint them up, clamp back to back, then take a pass with a #7.Pete
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