A through cut on a table saw is any cut where the blade passes completely through the workpiece, separating it into two or more pieces. This is the most common type of table saw cut and includes rip cuts, crosscuts, and miter cuts. It stands in contrast to non-through cuts like dadoes, grooves, and rabbets, where the blade only removes a channel or notch without fully dividing the wood.
Through Cuts vs. Non-Through Cuts
The distinction is straightforward: if the blade exits the top surface of your wood and the piece separates into two parts, that’s a through cut. Every time you cut a board to length or rip it to a narrower width, you’re making a through cut. The blade height sits above the wood’s surface, and sawdust ejects cleanly from the cut.
Non-through cuts are partial. A dado, for example, is a flat-bottomed channel cut partway into the wood to accept a shelf or panel. A rabbet removes a step along the edge. In both cases, the blade stays below the wood’s surface and never fully divides the piece. This difference matters because it changes which safety equipment you can use, how you set blade height, and how you manage the offcut.
Types of Through Cuts
There are three main through cuts you’ll make on a table saw, and the distinction between them is based entirely on grain direction, not the orientation of your board on the saw.
- Rip cut: A cut made parallel to the wood grain, used to reduce a board’s width. Rip cuts are naturally aggressive because the blade follows the grain structure, which allows faster feed rates but often leaves a rougher surface. The blade tends to self-feed as it tracks along the grain fibers.
- Crosscut: A cut made perpendicular to the grain, typically used to trim boards to length. Because you’re severing wood fibers rather than following them, crosscuts require more controlled pressure but generally produce cleaner edges straight from the saw. These are usually made with a miter gauge or crosscut sled rather than the rip fence.
- Miter cut: An angled cut through the full thickness of the board, commonly used for frames and trim work. A table saw sled with an angled fence offers better control for wider panels than a standard miter gauge.
Blade Height for Through Cuts
For a through cut, the blade needs to rise above the wood’s surface, but how far above is a point of ongoing debate among woodworkers. The general safety guideline from sources like LSU’s shop safety rules is to set the blade 1/8 inch above the workpiece. The logic is simple: less exposed blade means less potential for injury if something goes wrong.
Many experienced woodworkers prefer a slightly different approach. They raise the blade high enough so the gullets (the valleys between the teeth) clear the top of the wood. When the teeth fully exit the workpiece, sawdust chips are smaller and eject more efficiently. This produces a cleaner cut because as each tooth re-enters the wood on its rotation, it’s cutting downward into the material rather than dragging across it. In practice, this means the blade sits roughly 3/8 to 1/2 inch above the surface depending on tooth geometry.
Either approach works. The lower setting prioritizes safety margin; the higher setting prioritizes cut quality and chip clearance. What you should never do is raise the blade far higher than necessary, which exposes more teeth and increases the severity of any accident.
The Riving Knife and Blade Guard
Through cuts are the one situation where you can (and should) use a full riving knife and blade guard. A riving knife is a curved piece of metal mounted directly behind the blade that prevents the two halves of a freshly cut board from pinching back together against the blade. For through cuts, the riving knife sits at or just below blade height, keeping the cut open as the wood passes through.
For non-through cuts like dadoes, the riving knife must be removed or lowered to a non-through position because the wood isn’t being fully separated and the knife would interfere with the workpiece. This is one reason through cuts are considered the baseline operation of a table saw: all of the saw’s built-in safety features are designed to work with them.
Some woodworkers keep their riving knife permanently set just a hair below blade height. At that position, it still prevents the wood from closing on the blade during through cuts, and it doesn’t need to be adjusted or removed for the occasional groove or dado. The only tradeoff is that an over-blade guard, which typically attaches to the top of the riving knife, won’t mount properly in the lowered position.
Why Through Cuts Cause Kickback
Kickback is the most dangerous thing that can happen during a through cut. It occurs when the workpiece gets pinched against the spinning blade and is launched backward at the operator. Blade teeth on a table saw move at tip speeds up to 120 mph, which is more than enough force to throw a board violently and pull your hand into the blade in the process.
The most common scenario happens during rip cuts. As the blade separates the wood into two pieces, internal stresses in the lumber can cause one or both halves to shift inward, squeezing the back of the blade. Since the teeth at the back of the blade are rotating upward and toward the operator, the wood gets launched in that direction. Knots and other irregularities in the grain can create the same pinching effect.
Three things work together to prevent this. The riving knife keeps the freshly cut halves from closing on the blade. Anti-kickback pawls (small spring-loaded fingers that allow wood to move forward but dig in to prevent backward motion) act as a secondary catch. And the rip fence, properly aligned parallel to the blade, keeps the workpiece tracking straight so it doesn’t drift into the blade at an angle.
Push Sticks and Featherboards
The final phase of a through cut is the most hazardous moment. As the trailing end of the board approaches the blade, your hands are closest to the spinning teeth. Push sticks solve this by keeping your fingers well away from the blade while still applying forward and downward pressure to finish the cut. For rip cuts narrower than about 6 inches, a push stick is essential rather than optional.
Featherboards clamp to the table or fence and press flexible wooden fingers against the workpiece, holding it flat against the table surface and tight against the fence. This steady pressure produces straighter, more consistent cuts because the wood can’t wander during the cut. Featherboards are especially useful when ripping thin strips, where the narrow offcut is prone to vibrating or getting caught by the blade.
Zero-Clearance Throat Plates
The throat plate is the removable insert in the table surface surrounding the blade. Stock throat plates have a wide slot to accommodate blade tilting, but that gap creates two problems during through cuts. Small offcuts or thin strips can fall into the gap and get kicked back by the blade. And the unsupported wood fibers at the bottom edge of the cut can tear out as the blade exits, leaving a ragged edge.
A zero-clearance throat plate is a shop-made or aftermarket insert with a slot that matches the blade’s exact width. It supports the wood fibers right up to the cut line, reducing tear-out on the bottom face. It also eliminates the gap where small pieces could catch. If you’re making through cuts on plywood or other materials prone to splintering, a zero-clearance insert noticeably improves cut quality without any change in technique.