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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.) Besides directing the chips, the advantages of these configurations are best illustrated by the quality of cut, especially on veneered plywood (see the photos above).A down-cut bit will leave a clean edge on top but a ragged edge on the bottom; an up-cut bit will accomplish the opposite. This is great until you want to cut a dado with no tearout on the face.  Router-bit manufacturers have difficulty making solid-carbide spiral bits with cutting diameters larger than their shanks. So for small-shop hand routers you won’t find many bits with a cutting diameter larger than 1/2 in., the size of the largest bit shank. What is a downcut router bit? 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. These tools are predominantly used when a high quality cut finish is required on the top surface of cut parts. Downward spiral tools often require reduced cutting speeds because the chips are pushed back into the material. The chip extraction is generally less effective with thi. Up-cut and down-cut (or up-shear and down-shear) router bits are nothing new. The terminology simply means that instead of running parallel to the body and shank of the bit, the cutters of these two types of bits are angled. But this seemingly minor difference has a considerable impact on the way the bits perform.  Shear bits behave differently depending on whether they have an up-cut or a down-cut configuration. The down-shear of the flush trim bit you see on the left forces chips and shavings downward away from the router, and also has a tendency to pull the base of the router downward toward the material (as counterintuitive as that may sound). Both of these behaviors are desirable in many applications.
Feb 15,  · What is a downcut router bit? 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. These tools are predominantly used when a high quality cut finish is . Jul 20,  · The direction of the bit’s movement and the direction from which it originates both matter to the cut. Among the debatable aspects of an upcut versus downcut router is from which direction you are approaching the piece versus the spindle’s rotation. Unlike a straight-fluted bit, a down-shear bit slices downward into the top surface of the material and as a result, leaves a crisp, chip and “fuzz”-free cut edge. Likewise, an up-cut bit – although it is less often the purpose of using one – leaves a similarly clean edge on the bottom side of the material.

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