Apr 08,  · "If you use a router table, a down spiral pulls the cuttings up away from the router to wher Up Down Spiral Router Bits Zero they can be removed by dust collection." Actually, just the opposite is true. The terms 'upcut spiral' and 'downcut spiral' refer to the direction of the slicing force when a router is hand-held. 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. Aug 15,  · 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.)5/5.
Since I've worn out my 1/2" and 1/4" bits, I'm looking at spiral bits from whiteside as replacements. I will use them both in handheld applications, and in a router table. Mostly they will be for Dadoes. Should I be looking at up cutting or down cutting bits? Nov 30,  · Hey Dan. As far as finish side and up vs down, it kind of depends on what you are doing. For instance, a dado using a hand-held Up Spiral Bit Vs Down Spiral Bit Key router would have the cleanest cut using a down-spiral. 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. 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 .

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