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The Upcut, Downcut, and Compression Router Bits

The upcut bit is a standard for all sorts of cutting operations in solid wood. However, its spiral geometry often creates rough edges on the top veneer layer of plywood.

The invention provides a guillotine shear of the upcut type for flat rolled articles which is free from the drawback mentioned above. The lifting means of the shear are comprised of links of toggles.

Upcut Router Bits

Upcut Spiral Router Bits feature a new low-angle spiral designed to shear wood cleanly for better chip evacuation and superior edge life. This production quality router bit is great for plunging and routing through a workpiece as well as cutting mortises, tenons and deep blind holes in production applications.

These bits are a favorite for flush trimming and pattern routing at the router table. They're also used for grooving and slotting and are a great choice for hard or figured woods where tearout is a problem.

Because of their geometry, upcut bits pull the workpiece toward the rotary motor. For this reason they should be secured with a vacuum or held down with a steady hand. Downcut bits cut slower and push chips away from the rotary motor and are good for cutting materials where you want to prevent top surface splintering such as veneers, laminates and inlays. These bits are also a good choice for high-volume shops.

Downcut Router Bits

The downcut bit shears wood cleanly and ejects chips downward to eliminate the fuzziness that occurs on the top of the cut edge when a standard upcut bit is used. It is a preferred bit for morticing and other work that requires precision on the bottom face of the piece like pattern cutting at a router table or when going through a workpiece.

These bits have a low angle spiral that shears wood cleanly and provides good chip ejection to help reduce tool heating. They are ideal for all forms of solid timber along, across and end grain as well as melamine, veneered boards and ply.

These bits cut slower and struggle to clear their own kerf so they do require a lower feed rate than upcuts. They also do not perform as well on thin/small work pieces and can lift the workpiece so a secure hold is required. This type of bit is suited to high volume shops with a strong vacuum system for chip control or a good clamping method.

Compression Router Bits

A compression bit combines both up shear and down shear flutes to prevent tear out on both sides of the material and is ideal for CNC routing double-sided melamine, plywood and laminated materials. This unique bit also works well in soft woods, hardwoods and solid wood composite materials. It utilizes a proprietary carbide formulation for exceptionally sharp cutting edges that stay keen and last longer.

These bits can be used in a router table or handheld. We recommend reserving these bits for use in a router table as they can be run at a higher RPM than straight or downcut bits. The bit geometry pulls the workpiece toward the router which makes it a good choice for pattern routing at a router table.

Our most popular compression bit is 06-694 with a 1"cutting diameter and 2" cutter height. It's great for stock up to 5/4 thick and is well suited for routing large curves. It has a long up cut portion that extends into the shank for improved chip evacuation. This allows the bit to cut at a faster feed rate without overheating.

Straight Router Bits

Nothing puts the finishing touches on a woodworking project quite like a well-routed edge. And while there are a handful of router bit types that serve different purposes for grooving, routing edges or cutting dados and rabbets, a novice may be unaware that these bits come in a variety of cutter lengths.

Longer cutters can increase deflection and vibration, so a hand-held router user is better off sticking with shorter bits. That's especially true for straight router bits that cut through the top and bottom of a profile.

Unlike solid-carbide spiral bits, which look like drill bits and work at very high speeds, straight router bits generally need to be used with a slow feed rate of up to about 50 ipm. This helps them avoid burn and splinters, while still clearing chips efficiently. Dedicated plunging straight router bits have angled carbide flutes that shear rather than chopping, which is kinder to the cutting edge.

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