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Bent lamanation settling

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Forum topic by EandS posted 09-15-2011 09:30 PM 1170 views 2 times favorited 6 replies Add to Favorites Watch
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EandS

73 posts in 1922 days


09-15-2011 09:30 PM

I was experimenting with bent lamanations today for some modernistic tables. I noticed when I removed them from the form that they have lost shape from the form a considerable bit. Now this isnt to say that the pieces are ruined. They still are bent perfectly and seamlessly and will work GREAT with this table I am just wondering.
Is this typical for a lamanation to settle after its unclamped? Should I leave it clamped longer? Use a different type of glue?
Any advice would be accepted.

-- ~ eandscarpentryandwoodworking.com ~


6 replies so far

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SASmith

1850 posts in 2447 days


#1 posted 09-15-2011 11:30 PM

What glue did you use? Most people over-bend the lamination knowing it will spring back.

-- Scott Smith, Southern Illinois

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EandS

73 posts in 1922 days


#2 posted 09-15-2011 11:41 PM

I used white Gorilla glue. I covered the entire surface 100 percent of course.
Thats what I thought about it springing back, I just wanted to check with you guys and make sure that it was actualy supposed to do that.

-- ~ eandscarpentryandwoodworking.com ~

View John Ormsby's profile

John Ormsby

1283 posts in 3197 days


#3 posted 09-15-2011 11:54 PM

You will need to use either Epoxy or Urea Resin glues to keep the lamination from springing back. One must also play around with the thicknesses and tightest curve desired that will work.

-- Oldworld, Fair Oaks, Ca

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shipwright

7163 posts in 2258 days


#4 posted 09-16-2011 01:03 AM

I’d go with urea formaldehyde as the best glue. Epoxies need a little room and if clamped too tightly as in a sharp lamination can fail as all the glue is driven out of the joint. If you want to use epoxy, add a thin glass cloth or the like to prevent this.

Generally though, spring-back can be reduced by using more, thinner laminations.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

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DLCW

530 posts in 2114 days


#5 posted 09-16-2011 02:59 AM

Plastic resin glue (DAP Weldwood). Little or NO springback. I use it exclusively for bent lamination and veneer work. My local Ace Hardware carries it.

-- Don, Diamond Lake Custom Woodworks - http://www.dlwoodworks.com - "If you make something idiot proof, all they do is make a better idiot"

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fussy

980 posts in 2510 days


#6 posted 09-17-2011 01:44 AM

Paul and DLCW are on it. The problem with most glues is they introduce too much moisture. As the glued up form dries, it shrinks and springs back. Urea formaldehyde won’t/ Wear a respirator and have pleanty of ventillation.

steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

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