Down-cut Bits cut slower and push chips away from the router to eliminate top surface splintering. Use for pattern cutting or when going completely through the board as it allows clear vision of the cutting line. Ideal for fine finish work such as veneers, laminates, inlays and repairs because they prevent upper edge tear outs. Use Down-cuts for trimming and sizing. Compression Bits Cuts through stock and gives clean cuts in both top and bottom. No tear out as bit is designed to pull work into the center of the stock. Ideal for double sided veneer plywood, melamine, and laminates. Whiteside Router Bits RU Standard Spiral Bit with Up Cut Solid Carbide 1/4-Inch Cutting Diameter and 1-Inch Cutting Length. out of 5 stars $$ $$ RFT = Up Cut RFTD = Down Cut When choosing spiral router bits always remember that up cut spirals direct shear towards the router and down cut spirals direct shear away from the router. Up cut therefore favours the face of the work piece facing away from the router and down cut favours the face of the work piece facing the router. Chip clearance follows in the same direction as shear.  Please Note: We recommend that the RFT and RFTD be used to trim no more than mm wide × mm deep (1/8" × 1/4") due to the very fine diameter ball bearings. Heavier trimming can be accomplished by pre-trimming to mm wide × mm deep; using the modified 's which are factory installed with heavier bearings. Quote from: Cheese on August 13,PM. For notds, the up cut bit will be most efficient. Here's the one I'm using. Spiral donw look like spiral down cut router bit notes bits Spiral Down Cut Router Bit Youtube and are most often made of solid carbide, so they are super sharp and leave a superior cut on wood. Festool USA does not pre-approve the contents of this website nor endorse the application or use of any Festool product in any way other than in the manner described in the Festool Instruction Manual.

Straight bits, on the other hand, go through dozens of fractional sizes, all the way up to 2-in. Depending on the job you have in mind for your router bit, straight bits also come in a variety of cutter lengths. So you can buy close to exactly the length of cutter you need.

Straight bits also have a huge advantage over spiral bits when it comes to template routing, because you can buy them with guide bearings.

And those bearings can be mounted on the tip of the cutter or on the shank of the cutter, depending on your needs and your template. The bearings are made for a variety of cutter diameters and lengths.

With their superior edge cut, spirals make great template cutters when used with collar guides. But when it comes to bearing-guided bits, spirals seem to be available only with bearings mounted on the end of the bit. Shank-shod, bearing-guided, solid-carbide bits spiral bits with the bearings on the shaft end of the bit , which would permit template routing with the template on top of the work and trim cutting through only part of the work face, are not available.

Some woodworkers like to sharpen their straight bits, although I find it difficult to get it right and always send out my bits for sharpening. Carbide-tipped straight bits usually have enough carbide thickness to be reground four or five times, and the tech- nology to do so is common.

A few services claim to be able to sharpen spiral bits. To me, this translates into a substantial loss. Spiral bits might stay sharp longer than straight bits, but even so, the cost of using spiral bits will always be higher. Spiral bits work incredibly well in the production environment and especially in CNC computer numerically controlled router industrial applications.

But in a hand router, their use sometimes imposes unusual risks not associated with the equivalent or bigger straight bits. The down-cut spiral bit's screw-driven forces are sufficient enough to pick the router up and twist it out of your hands—with no warning. I know, because it has happened to me.

On end grain the spiral bit is getting even more traction, so the risk Spiral Down Cut Router Bit Values is even greater—a pity, too, because a sweet end-grain finish is attractive. The up-cut spiral bit can have the opposite effect.

It wants to pick up the work. So you must secure the work in some kind of fixture or hold it by a clamp. I never rout anything that is not secured or clamped, but some people do.

I do keep a few solid-carbide spiral bits because, when I want a beautiful face cut or I am cutting narrow mortises, and I have the money, there is just nothing better. But my cabinet is mostly full of a wide variety of straight bits. For general-purpose work, for template and pattern routing, and for those times when need a large-diameter bit, I still reach for one of my straight bits. Quick View. Add to Cart. You must be logged in to write a comment.

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Friends of Woodcraft. Getting Started with Woodworking. Make Something. Pen Kit Reference Chart. Press Releases. Resin Casting. 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 Spiral Down Cut Router Bit 2019 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. This reduced pace allows the bit a little more time to throw chips out and for them to be re cut into smaller pieces that eventually are thrown from the hole or slot. Making shallow cuts to achieve the full depth needed is always important, but especially so with a down cut bit.

The combination of a deep cut and a build up of chips can cause the bit to over heat and even break. For most woodworkers, the down cut type of spiral bit is most useful, particularly for those using a router to cut dados, rabbets and visible slots. Some woodworkers like cutting mortises with a router, table mounted or hand-held. For them, the up cut bit will be most efficient.

The ideal situation is to have both types of spiral bits in the drawer, in the size or sizes you most often use.

The quest for more tools certainly does not end with spiral router bits. The Infinity part numbers are, up cut bit — , the down cut bit — Visit the Infinity Tools web site — Click Here.

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