hinges

5th corner

CGF II, Certified Grumble Framer Level 2
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Oh and if hinges let go is it the humidities fault or is it something else?
 
it also might be that the hinges were not allowed to dry under weights. Just like a wood jint, a slight clamping will have a stonger joint than one that is not clamped.
 
Originally posted by 5th corner:
Oh and if hinges let go is it the humidities fault or is it something else?
If hinges let go, it probably is not due to normal himidity. Extremely high humidity could do it, though -- and there probably would be no question about the cause. The hinges would fail, the wood moulding might warp & its finish might peel, mold & mildew might grow. Also, the 4-ply boards in the frame might de-laminate, because they are also pasted together with a water-base adhesive.

I guess it's something else.
 
Wheat starch hinges are very strong - in the "Shear" mode. If you design them o be iin the "Peel" mode, they are terribly weak. Peel would be like a "V" hinge. Any weight or impact will peel the hinge right off the art or backing.

So... to make sure your primary (top) hinges never get into the "Peel" mode, alway have at least one loose "Safety" hinge at the bottom (or more and even at the sides on heavy or large art) to keep the primary hinges from failing.

Check out the article on hinging on the FrameTek web pages under the pull-down heading titled "Free Info"
 
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