Lead Photo by Rob Brown Illustrations by James Provost Woodworkers need to do two things when engineering and building a piece of furniture 1 machine joinery that will secure different pieces of wood to one another with the appropriate amount of strength and 2 allow wood movement to freely take place. Wood movement including the relationship between moisture content and wood movement direction of movement how wood changes shape and estimating wood movement. In the meantime however I was lucky enough to have run the camera for Chris Becksvoort s class at Fine Woodworking Live 2013 titled 40 Years of Woodworking Tips.

I knew that wood swelled and shrunk with changes in its mois-ture content but I assumed that this tendency could be controlled with a tight joint and plenty of glue.

Woodworking If you look at the end of a piece of wood you will be able to see lines which are the so-called age rings of trees. Wood Movement and How It Affects Your Woodworking Projects This end table by Richard Slosky demonstrates one way to attach a table top while allowing it to be able to expand and contract with changes in moisture content. WOOD MOVEMENT 101 The ABCs and D A. WIDTH MOVEMENT IS THE MAIN ISSUE. A couple of years ago I attended a workshop with Grahm Blackburn at the Woodworking show covering a lot of topics from design to wood movement. One of the topics covered by our resident Shaker expert was calculating panel widths to account for wood movement. Wood that is harvested from near the center of the trunk will display less movement than wood that is harvested from the edge of the trunk. Then he lays out methods for accommodating wood movement in a range of structural situations commonly encountered by the furnituremaker from the simple to the complex.

One thing he told us is wood does what it wants to do. You can never be absolutely sure of where or how much it will move but you can plan accordingly and minimize or eliminate it all together. Dealing with Wood Movement. The wood we mostly work with today is not as good as the wood used by craftspeople fifty seventy five or a hundred years ago. In this webinar he explains the reasons for wood movement and why the amount of movement varies depending on the climate the wood species and the way a plank is cut. If your plans don t accommodate wood movement you ll end up with trouble like this cracked tabletop. Wood will move over time and in response to environmental conditions and while it may not always be possible to predict the movement with absolute certainty there are some indicators we can utilize. When I first took up woodworking I had only a rudimentary and naive understanding of wood movement. Part of the Workshop Companion a collection of information on wood woodwork woodworking skills woodworking materials and woodworking plans that together form the core knowledge needed by woodworkers furniture makers

Wood doesn t move much lengthwise so you don t have to worry a lot about boards getting shorter. Family Handyman Wood moves as its moisture content changes. I quickly learned that dealing with wood movement isn t so simple.

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