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Forum topic by End_Grain posted 01-20-2010 10:09 PM 822 views 0 times favorited 1 reply Add to Favorites Watch
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End_Grain

95 posts in 2597 days


01-20-2010 10:09 PM

Topic tags/keywords: edge gluing glue bit

I started using a reversible glue joint for my edge gluing needs. I like it. Now that I understand the relationship or the cut to adjusting the bit up and down, getting it set takes just a few seconds and a couple of test pieces. After laying up a 20” X 48” panel and liking the results and ignoring all the rules I started thinking, ’If I only put glue in the lower groove, any squeeze out will be inside and be less noticeable and less work for me during finishing.’ Feeling smug, I quickly laid up two more panels putting glue in the lower groove only.

Several hours later I removed the clamps and set them up for the night. The exterior of the panels were perfectly clean and flat. Fast forward to the next morning, I move the panels out of the way and sure enough as I sight down them, they were bowed; but not the first one. Okay what the heck is going on? Check orientation of end grain and it is textbook. The only difference between the first and second and third panels is the first panel had glue in both grooves. Oh well, my wife wanted a bunch more bird feeders and a squirrel feeder. Sigh.

-- My greatest fear is that when I die, my wife will sell all my stuff for what I told her I bought it for.


1 reply so far

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PurpLev

8523 posts in 3108 days


#1 posted 01-20-2010 10:21 PM

isnt putting glue only in 1 groove prohibits (about) half of the joint not to have an even spread of glue, definitely there will be an inbalance between the amount of glue on each side of the joint, which in effect would cause different forces, and different adhesion capabilities on each side of the panel – leading to cupping. or at least thats what my reason tells me.

at least you have a plan for those boards :)

a lesson acquired from practice is priceless.

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

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