Whiteside Router Bits RD Standard Spiral Bit with Down Cut Solid Carbide 1/4-Inch Cutting Diameter and 1-Inch Cutting Length. out of 5 stars $  Up-cut bits offer better chip ejection. Perfect for mortises, stopped dadoes and plunge cuts. Metric sizes to work with Festool Domino loose tenon joinery1/4" shank. Advice on plunge cutting with a router. Plunge based routers can cut into the surface of a material. Wonkee Donkee Trend.  Most bits that can plunge-cut will be identified on their packaging. However, there are some other features that characterise them: A plunge-cutting tip. This is basically a pointed and very sharp tip located at the base of the body, which is able to pierce the material, cutting into it from above. This tip will either be an extension of the cutting edges or will be ground on separately. The steeper the angle of the tip, the easier that bit will be to plunge-cut. Spiral bits. All spiral router bits are able to plunge-cut. A cutting edge or edges running along the bottom of the bit. Cutting edg. Choose an up cut end mill bit by finding the largest cutting diameter and shortest cutting length that your router and project can accommodate. Always opt for the largest cutting diameter as this will help achieve the smoothest finish. Yonico solid carbide up cut end mills are manufactured from the highest quality micro grain C3 solid carbide and will last for hours of use and maintain its sharpness throughout. The quest for more tools certainly does not end with spiral router bits. Have a comment about this story? Joinery Sets. This chip ejection deficiency of down cut bits is minimized but the relatively shallow cuts they most commonly are used to make. Cart is empty.

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V-Point Boring Bits. Click image to enlarge Up Cut vs. The number of email questions on this subject instigated this story.

Though the flutes run in opposite directions, telling an up cut from a down cut bit can be difficult if you cannot imagine their rotation in the router. Though a router always turns in Bowl Cutter Router Bits Windows 10 the same direction, from the operators perspective, that rotation appears to reverse depending on if the router is bit down in the common hand-held mode or bit up, as when mounted in a router table.

With the bit down, the rotation is clockwise. That means the side of the bit farthest from the operator is turning left to right, the near side right to left.

This is very important for feed direction, as we always want the cutting edges turning against the feed direction, not with it. When the router is oriented with the bit up, as when mounted in a router table, the side of the bit closest to the operator is turning left to right and the back side right to left.

Because the wood is fed against the rotation of the cutting edges, we almost always work against the front side of the bit. If the wood is fed into a router bit on the wrong side, the feed direction matches the bits rotation, making a dangerous kick out all but certain. Feeding the wood with rather than against bit rotation allows the cutting edges to become highly efficient feed dogs that grab the wood, accelerate it and shoot it off the table at dangerous speeds.

Up cut bits are very efficient at evacuating chips from the hole or slot it is cutting. Deep holes or grooves still have to be cut using multiple light cuts, but the upward direction of the flutes while rotating prevent the debris from building up in the hole and binding or even breaking the bit. The problem with up cut bits is that the same action of the flutes that brings the chips up can also lift or fray the wood fibers around the edges of the cut.

While this damage is usually minor, especially with good quality bits, it can be noticeable if those edges will be visible when the project is assembled. Up cut bits are frequently used for cutting mortises because of their depth. Since the edges of a mortise are eventually hidden by the shoulders of the tenon that will be fit to it, this chipping or fraying will be hidden after assembly and have no impact on the finished project.

The downward slicing action of a down cut bit leaves a very clean, crisp edge around the hole or groove it cuts. While chips still are evacuated from the hole, a down cut bit is far less efficient in this respect than is an up cut design. This chip ejection deficiency of down cut bits is minimized by the relatively shallow cuts they most commonly are used to make.

Down cut spiral bits are a good choice for cutting dados or shallow grooves, especially when the edges will be visible when the project is assembled. Down cut bits require a slightly slower feed rate.

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