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Feb 15,  · Downcut spiral tools are best used for thinner materials which will be pushed down into the machine bed rather than being lifted with an upcut spiral. This can be particularly useful when using vacuum hold down where maintaining the seal . Apr 08,  · down vs. up spiral bit Mardon | Posted in Power Tools and Machinery on March 26, am In what situation would you ever use a down spiral router bit? An up cut or up spiral bit cleans the shavings but a down cut or down spiral bit seems counterproductive. Spiral double compression bits combine both an up-cut and down-cut configuration, and are the most widely used of a variety of router bit. A double compression spiral bit is the ideal choice for edge trimming and cutouts in situations where both top and bottom edges of .
For example, one Internet source sells a 1 ⁄ 2 x1 1 ⁄ 4" straight bit for $18, but an up-cut spiral bit the same size costs $A 1 ⁄ 2 x1 1 ⁄ 2" bottom-bearing straight flush-trim bit costs $21 versus $ for a comparable down-cut flush-trim bit.. In addition to their lower price, straight bits work best on wide cuts. While the all-carbide construction of spiral bits limits their. You likely want an upcut bit. It will pull the chips up towards the router, which gives you better control in both handheld and table routing situations. Downcuts, especially on router tables, have a tendency to want to push the wood/router away from each other, though they may give you a slightly better finish on the edges of a dado. Spiral Bits Leave a Clean Edge The three basic cutter configurations for spiral bits are up-cut, down-cut, and a combination of the two, known as a compression bit. A down-cut bit sends the chips downward; an up-cut bit sends them up to ward the shank. (On a router table, all direc-tions are reversed.).

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