Why Spiral Router Bits Are Better For Plunge Cutsīecause a spiral bit is designed much like a drill bit, it makes plunge cuts easily. You may also like the Joinery Router Bits, click here for details.These big three have been joined by such specialty spirals as bearing-guided up-cut and down-cut flush-trim bits for template work and combination bits with short up-cuts and longer down-cuts for chip-free mortises. Up- and down-cut flutes meet in the middle of the bit (below) to compress veneer on both faces of a panel tightly against the substrate. Be careful: The downward force can lift a handheld router off your workpiece. They don't clear chips as well as the others, so use multiple 1⁄4 "-deep passes, or cut relief kerfs with your tablesaw. These spiral bits press veneer down as you make plunging cuts for dadoes, rabbets, and grooves. They lift the veneers on sheet goods when making plunge cuts, but push down on veneer when used in a table-mounted router with the "good" side up on the workpiece. (Picture the left-to right rise of the spiral.) Like a twist drill bit, these bits quickly evacuate chips from deep cuts. Most spiral bits use one of three flue patterns descibed on the next slide. That lets bit-makers use wear-resistant carbide formulas that stand up better to abrasive glues and resins in plywood, particleboard, and medium-density fiberboard. And unlike straight bits with carbide cutters brazed to a steel body, spiral bits are all carbide. This leaves a cleaner cut because a portion of the cutting edge constantly touches the wood. So why pay for the upgrade? All spiral bits share one advantage over straight bits: Their angled cutting edges slice, instead of chop at, the wood. Like a coach-class airline ticket, a standard straight bit ( KoneTool: Straight Router Bits S upplier) gets you where you need to be, and for a lot less money. Spiral bits plow through material the way business jets slice through the sky but neither of these high-tech tools fit everyone's budget. For the ultimate in finishing, nothing beats a solid carbide spiral bit, but they can be delicate and costly. If a plunge cut with a flat bottom is desired, look for the plunging straight router bits. A straight router bit with shear has angled carbide flutes for a slicing rather than a chopping cut which produces a cleaner edge. Fewer flutes mean improved chip clearance and faster speed. A single flute is used when cut speed is more important than the finish. They will have less vibration and a smooth cut. The most popular choice is a two-flute carbide-tipped router bit. There are many decisions to make in straight router bit selection. Straight & Spiral Router Bits Buying Guide
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