Why a table saw alone cannot create perfectly square lumber
In short: Achieving a perfectly square board requires more than just one machine. To transform raw timber into usable material, woodworkers must navigate the distinct mechanical roles of the jointer and the table saw, balancing surface flatness against edge parallelism while managing hidden internal moisture.
The process of milling lumber begins with establishing a reference surface. Using a jointer, woodworkers flatten one face of a board to create a stable base. This is done in batches, ensuring that all boards are processed at the same height to maintain consistency across a project. Once flat, the board is returned to the jointer to square an edge against that face. A critical technique here is orienting the grain so it runs 'downhill' toward the operator; this ensures the wood is pushed into the cutter rather than being torn out.
A common misconception in woodworking is that a jointer can complete the entire squaring process. While a jointer excels at making an edge perpendicular to a face, it cannot make two opposite edges parallel to one another. This is where the table saw becomes essential. By using a rip fence, the table saw cuts the board to a specific width, ensuring that the new edge is perfectly parallel to the previous cut. To ensure safety and precision during this stage, woodworkers often set the boards slightly wider than their final dimensions to allow for shop acclimation.
The physics of wood adds another layer of complexity: internal moisture distribution. Because the exterior of a large piece of lumber dries faster than the interior, hidden pockets of moisture can cause unpredictable bowing or twisting during the ripping process. To prevent these boards from closing up on the blade—which could lead to binding or dangerous kickback—woodworkers use a splitter. This component sits behind the blade to keep the wood open, ensuring a clean, straight cut regardless of internal stresses.
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- Summary by Intellect · source: Square Lumber with Planer & Table Saw | Woodworking
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