No need to know the vocabulary first
A few words, explained
- Stock
- The wood or other material you start with.
- Joinery
- The methods used to connect pieces of wood.
- Grain
- The direction and pattern of the wood's fibers.
- Moisture content
- How much water the wood contains, measured against the weight of the wood when completely dry.
- Board foot
- A lumber-volume unit equal to a piece 12 inches long, 12 inches wide and 1 inch thick.
Read grain direction before designing the joint
Solid wood moves most across its width, not along its length. Lay out panels, tabletop battens, breadboard ends, and frame-and-panel assemblies so cross-grain movement has somewhere to go.
Acclimate and measure before final milling
Bring lumber into the shop environment, let it settle, then mill in stages when stock is thick or unstable. A moisture reading is a planning signal, but flatness and stress relief after rough milling still matter.
Build allowance into the hardware and joinery
Use elongated holes, tabletop fasteners, floating panels, clips, or other methods appropriate to the piece. The goal is not to stop movement; it is to prevent movement from splitting the work.
Shop 101
Plan movement clearance in a joint
Identify the fixed reference, required movement clearance and joint detail to test on matching stock.
- Mark the grain direction on the wide parts of one project.
- Choose the fixed reference point in the assembly.
- Prototype the most critical joint, reveal, or fastener detail on matching stock.
Try it with your own numbers
Common questions
Which direction does wood move the most?
Wood changes most across the grain—across the width of a board or panel. Lengthwise movement is comparatively small for typical furniture work.
Should I let lumber acclimate before building?
Yes. Let stock adjust to the environment where it will be machined, then assess moisture, flatness, and stress before final milling and assembly.
Can finish prevent wood movement?
Finish slows moisture exchange but does not eliminate seasonal movement. The joinery and mounting method still need to accommodate it.