glue'n and clamping

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Forum topic by Paddle_Tail posted 03-06-2014 07:55 PM 841 views 0 times favorited 4 replies Add to Favorites Watch
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24 posts in 990 days

03-06-2014 07:55 PM

Topic tags/keywords: joining clamp tip trick question

ok, may have been on here before but i seem to be having trouble the most in two areas that have bugged me for some time. during my glue up i lay my bead of glue down and smashed together I have even brushed it on and at the end (over night) their seems to be bubbles and missed places in between the joints how do I get this to stop. Also when I’m clamping I make sure that the table is flat of course. then I clamp but it seem to always bend up at the ends and sag in middle. am I applying to much pressure to it I try to place to the clamps alternating them top of board then under board till out of room. any advice is greatly appreciated. Thanks in advance.

-- Wayland,Arkansas,~Chance Favors The Prepared Mind~

4 replies so far

View PurpLev's profile


8523 posts in 3068 days

#1 posted 03-06-2014 08:05 PM

“bubbles and missed places” – your description makes me think that your pieces are not jointed properly and are not completely flat prior to joining them together- this would be the only reason for “missed places” in a joint. otherwise if the 2 parts being glued together are jointed flat properly there will be a seamless joint – no place for bubbles to form, or for any missed spots to exist. you will not be seeing the glue line at all.

“bending up and sagging” – you may be putting too much pressure on the clamps for the thickness of your work pieces. Generally speaking – the thinner your boards are, the less pressure you should put on the clamps. In order to avoid bending and sagging during clamping, you should also look into using cauls to keep things inline and flat

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View pintodeluxe's profile


4825 posts in 2233 days

#2 posted 03-06-2014 08:33 PM

Try to joint the edge of the boards paying particular attention to their orientation. Joint one board facing the jointers fence. Joint the next board facing away from the jointers fence. Then the boards will lay perfectly flat, even if the jointers fence is not perfectly square.

I also try to use the same type of clamps on top and bottom of the glueup. Pipe clamps for instance exert much more clamping force than parallel clamps. A situation where you have pipe clamps on the bottom, and parallel clamps on top would cause a bowed panel.

Good luck with it.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View Gerald Thompson's profile

Gerald Thompson

804 posts in 1654 days

#3 posted 03-06-2014 08:40 PM

Try a dry clamp up first. Inspect the joint for gaps. Shine a flash light behind the joint to really make sure.
Make clamping cauls. Google Mike Henderson. His sight has simple, effective cauls that are cheap and easy to make.
I do not know how you are edge jointing the boards. If they are about 1/32’’ apart in the middle that could be clamped so the edge face would be in contact and glued. Do not over tighten the clamps. This can leave glue starved areas and also stress the boards out of flat.
If you have a sharp #5 jack plan put the boards edge up in a vice, both at the same time, and joint both edges. Place the edges together and they should be right on.
Clamps, cauls and matching edges are what need to be learned and it is not too hard to learn and do. It beats the frustration of keep doing it half right over and over.

-- Jerry

View Paddle_Tail's profile


24 posts in 990 days

#4 posted 03-06-2014 09:11 PM

thanks guys, i am after all a noob at wood working never heard or seen a clamming caul but i have now and off to make some. As for me edging ill definitely try the suggestions see if that helps. thanks

-- Wayland,Arkansas,~Chance Favors The Prepared Mind~

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