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Apr 08,  · down vs. up spiral bit. 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. Aug 15,  · 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 5/5. Jun 05,  · Ethan talks about the differences between up spiral, down spiral, single flute and two flute router bits. He goes when, where and what to expect using these.
Nov 30,  · A good up-cut bit will leave a pretty clean cut too, but technically-speaking, the down-spiral would be a cleaner cut. So yes, the show side would be up in this case. But lets say you were using a hand held router and plunging all the way through the piece, for something like a through mortise. Sep 10,  · If you need 2 perfect faces, a compression bit combines a short (5/16 to 3/8 long) up spiral tip with a down spiral bit, so all cutting forces are directed to the centre of the work so both faces are supported for absolute minimum tearout. 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 between the material and sacrificial bed is crucial.

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