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upcut-spiral-router-bit-position Using the upcut spiral bit with bearing in my router table makes smooth even templates cuts with NO SPLINTERING. Also the downcut spiral bit with bearing when used in my handheld router makes the the same smooth even cuts with NO SPLINTERING. Very very happy with the results and would recommend these bits. Thanks MLCS.  Upcut spiral helps remove material. Ideal for making mortise and tenon joints. HSS Spiral Upcut Router Bits. Item #. Large Diam. Straight router bits come in three varieties: Spiral-upcut, spiral-downcut and straight-cut bits. The choice of which to use comes down to the specific job and your preferences. The difference between straight and spiral bits is not only the helical shape of the cutting surface, but also how they function. With a helical shape, you get a shearing cut, which leaves the surface smoother with less tear-out.  Spiral-downcut bits have the reverse effect, pushing the router and the work apart. This may not sound like an advantage, but when trimming or grooving a veneered surface, the down-cut bit causes less lifting and tear-out of the veneer. It might sound like I am suggesting you only have spiral bits in your core group; I am not. In fact, none of the bits in my core set are spiral bits. Upcut vs Downcut. Up-Cut vs Down-Cut Geometry (Courtesy Eagle America). Depending on which way the spiral goes on a cutter, you get a cutter that either moves the chips up or down. Whichever way the chips are going, there is also force exerted on the workpiece in the same directions. So, an upcut will move the chips up and out of the cut, and it will tend to pull up on the workpiece. BTW, the conventional endmill world refers to some cutters as left handed or right handed.  Why would you care about a down-cut bit? An upcut is a conventional endmill for all intents and purposes. For wood and materials that may chip, it has the disadvantage that it wants to pull chips along the top edge. Since a downcut pushes down, it leaves a cleaner cut on top, but can fray the bottom edge.
Router Bits, Pods, Tooling, and Accessories for your CNC Router, CNC Mill, or hand router 1/4 2 Flute HSS Upcut Spiral 1/2 shk; 1/8 inch 2 Flute SC Downcut Spiral Wood Rout; By Bit Type. Drills. Insert Tooling. PCD Bits. Profile Tools. Compression Spiral. Downcut Spiral. Upcut Spiral. Straight. These compression (upcut and downcut) spiral router bits cut both top and bottom edges of a board cleanly. £ Up and down spiral bit ; £ Up and down spiral bit . The Mite-R-Slide ™ is a unique new miter gauge accessory for the router table. Designed to be mounted to the backside of the Mast-R-Fence II ™ or the Rout-R-Fence ™ and slide smoothly across the table on a polished steel bar positioned above the Freud Spiral Upcut Router Bit www.- innovative accessory is engineered to perform precision machined square or angled cope cuts, crosscuts and other end milling.

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