dimanche 2 août 2015

Why are my frames twisted?

I have made four of these with two coming out perfect and two twisted. All four were square to within 1/32" when measuring the diagonals.
TwistedFrame.jpg
I squared the stock. I glued it together with biscuits and used Jorgensen cabinet clamps. I used two clamps across the width at each end. The frame sat on the steel bars of the clamps. I was sure that the long boards touch the clamps at all four points of contact. The surface was level under the clamps.

What am I missing?
Attached Images
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Why are my frames twisted?

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