Breaking out lumber begins the process of turning rough material into a finished project. Complete this step properly, and you’ll have an easier time with all the other steps.
When purchasing lumber, make sure the boards are as straight as possible, especially boards that will supply you with the longest parts of your project. Even if you can machine the required parts from the board, a piece of heavily warped lumber will tend to move more than average once it’s been turned into a furniture part.
Knots can cause wood to twist and warp, they add structural weaknesses to parts, and depending on the species and project, can be an eyesore. If knots are in your material you can always cut around them, but it does take time and planning.
Letting wood sit in your shop for a while before cutting into it allows it to become at one with the moisture content in your shop. Planning and patience will become more important, or you can store lots of wood in your shop so it’s ready for action when you are.
Generally speaking, the moisture content of purchased lumber is acceptable, though if you don’t luck out you’ll pay for it with a project that moves much more than you want.
Jointers that don’t leave one board face flat and straight, and planers that chip wood or leave heavy snipe, will not help you create square, usable stock for cutting joinery in. Even mitre and table saws need to run true and create square cuts, to break out lumber accurately.
Once you have marked where the project parts will be cut from your boards, cutting to rough length or rough width will make breakout much easier and more accurate. Dressing 8’-long x 10″-wide boards isn’t easy.
Some parts can be rough cut from a board on an angle so its grain is parallel to the freshly cut edge, producing a more visually appealing workpiece. Extra thick pieces can be rotated slightly then dressed to create quarter cut / rift cut stock for aesthetics and function.
Whenever possible, obtaining all your parts from just one board will give you more consistent colour and grain. It’s surprising how different boards can be, even though they’re the same species.
When machining parts of like thicknesses, plane them all at the same time to ensure they are all exactly the same thickness. Doing so will help avoid slight discrepancies while machining joinery.
Don’t let parts sit around before machining joinery and assembling the project, as parts can warp. This causes joinery not to fit as tightly, or assembly to be more difficult. Also sunlight causes discolouration in weird spots while furniture parts sit around the shop, even if they’re stacked neatly.