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Super Micrograin Carbide with Titanium
Carbide is a metal powder and binder mixture molded at high temperatures and pressures. Wear occurs because grains of the hard metal powders break away. The larger the grain size, the faster the cutting edge dulls, and large grains creates "lakes" of binder which weakens the structure. Binders also break down from the chemical attack from the acids found in wood products. Freud is one of the few router bit companies who manufacture carbide. Our grain size is smaller than other grades and titanium is added making it more impervious to chemical attack. We produce several carbide mixtures for different cutting requirements, manufacturers who buy their carbide usually have only a few mixtures to choose from and these are usually formulated for metal cutting.
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Anti-Kickback Design
Kickbacks from router bits are dangerous and at 22,000 RPM you need all the safety you can get. Freud has always been devoted to safer woodworking, and made an early commitment to develop a full line of Anti-Kickback products. The Safety Dado was first followed by Anti-Kickback Design saw blades. Freud is the first major manufacturer to introduce a full line of Anti-Kickback Design router bits to the North American Woodworkers. The idea is simple, by limiting the amount of bite to the maximum safe amount, kickbacks are reduced. Other manufacturers do not think woodworkers are, concerned with safety, but we know different. Any safety device, particularly one that does not inhibit performance, is appreciated. Even though this required us to make tooling modifications and increased material cost, we did not pass this cost on to the woodworker. Freud's philosophy is woodworkers should expect safety, not pay for it!.
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Computer Balancing
Router bits rotate at very high rates of speed. The larger the diameter of a router bit, the greater fly wheel effect they have. If a router bit is the slightest amount out of balance it will vibrate and chatter while cutting and can be extremely dangerous if the router bit is too far out of balance. A Freud router bit is computer balanced to insure vibration free operation at speeds that are a safe margin above the typical 22,000 RPMs of most routers. This is done on special computer controlled equipment that determines the exact location where material needs to be removed and indicates the amount that must be removed. After the material is removed the router bit is rechecked by the computer balancing equipment to be sure the proper amount of material was removed. This is the only way a router bit can meet our standards and provide the woodworker with the cut they expect from Freud.
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Shear Angle
The shear angle is the angle that the cutting edge makes with the shank of the bit. Our carbide tips are angled to slice through the wood fibers similar in principal to using a hand plane at an angle to the direction of motion. This slicing action becomes even more important when cutting cross grain. Freud's high shear angle bits leave a cross grain cut that requires practically no sanding. Bits without shear or with too little shear chop the wood and are more likely to produce tear-out and chatter marks. Producing high shear carbide bits uses more carbide and requires additional machining processes, but our dedication to the Total Quality Concept demands we produce not only the highest quality tools, but also the most advanced.
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Advanced Tri-Metal Brazing
Brazing uses a low melt point alloy to bond the tips to the bit body. The tips and body are heated above the melt point of the brazing alloy. When brazing, the tip and body expands and contracts at a different rate. Other manufacturers use just a silver brazing alloy, and this can cause the joint to develop stresses that lead to cracks in the carbide or failed joints. Others use lower temperature alloys, but this creates a weak joint. Freud uses a process called Tri-Metal Brazing. A layer of copper alloy is sandwiched between layers of silver alloy. Copper is soft and will stretch without breaking. This flexibility allows the carbide and steel to contract without any residual stresses.
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Multi-Axis Grinding
The relief angle of a router bit is the angle the tip is ground behind the cutting edge, and is critical to achieve smooth, burn free cuts. When wood is cut, the fibers microscopically compress under the cutting edge and return to their normal position after the cutting edge passes. If the relief angle is too shallow the friction between the bit and the wood will cause burning. If the relief angle is to great the cutting edge will wear quickly. Other manufacturers use less expensive radial grinding to provide relief on their bits. This only provides adequate relief on the cutting edges parallel to the shaft. Our computer controlled multi-Axis grinding equipment provides proper relief on all cutting edges regardless of orientation. Though it cost more in equipment and time, it's the only way to produce bits of this quality.
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Order Line: 978-562-5575
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