Reply by William Shelley

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Posted on Expansion and Contraction..Am I thinking correctly

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William Shelley

609 posts in 2078 days

#1 posted 02-09-2017 11:07 PM

Clearly explained in post #6 ;)

As far as clins explanation:
”If you cut a board at 45-degrees and it then expands, the angle will become more than 45-degress (move closer towards a 90-degree cut). If it shrinks, the angle will become shallower.”

This is not true unless one side of the board is captured. Un-captured (theoretically) the board will expand equally and the angle will remain the same. (theoretically)

- jbay

Wood is not a homogenous material. Something like Corian would expand and contract equally in every dimension. Wood is going to move differently along X, Y, and Z axis. Thus the shape of a board with a miter will change over time.

-- Woodworking from an engineer's perspective

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