Router bits are cutting tools with specific geometry for use on wood, plastics, nonferrous metals and some composites. Routers offer high feed rates, heavy depths of cut and better finishes. Ideal for use in CNC routers, machining centers and milling machines. Router Bit Sets are also available.
Flute Geometry of a Router:
- Single flutes are for faster feed rates in softer materials.
- Double flutes are for better finishes in harder materials.
- Straight flute offers a neutral cutting action, which creates higher cutting forces than a spiral flutes.
- Upcut spiral flutes are for grooving or slotting. They are ideal for an upward chip evacuation and offer a good finish on the bottom side of the part.
- Downcut spiral flutes help eliminate part lifting and are ideal for downward chip flow. They offer better hold down in fixture and offer a good finish on the top side of the piece part.
- Up/Down spiral flutes are for double-laminated material and offer a good finish on the top and bottom side of the piece part.
Types of Router Bits:
Straightrouter bits are the most common bits and are used for grooving, cutting straight lines, and slotting a workpiece. They are used at higher speeds in soft materials and are available in a variety of diameters and lengths. Straight router bits don’t plunge into the material as well as spiral router bits because they do not have a round cutting edge at the bottom. However, they create higher cutting forces than a spiral flute geometry.
Spiral router bits are used for deep cutting, grooves and slotting in harder materials. The tips are ideal for plunge cutting and provide a good finish on a workpiece. Spiral router bits are also efficient at clearing chips during an operation. Upcut Spiral router bits create upward chip evacuation so they are efficient at clearing chips during an operation but rigid set up is mandatory. Downcut spiral creates downward chip flow and is better in less rigid setups.
Diamond pattern for use on phenolic-epoxy parts, polyester glass reinforced, and graphite composites. They are designed with edges that have up-cut and down-cut angles to grind through a workpiece.
Edge profile router bits are used for detailing edges of a workpiece. Some edge-forming bits include a pilot.
Drill points are ideal for producing clean cuts in aggressive milling applications. Some drill point bits are made of composite material for increased tool performance.
Burr end router bits are used for bottom cutting and producing floor finishes on the part where minimal material needs to be removed. They are used in very light applications.
End Mill router bits are used for bottom cutting and are designed to produce a smooth surface with a square corner.
Fishtail ends are designed with a double flute (or reverse V-shaped ends) and produce a flat surface at the bottom of the workpiece. Ideal for fine detail work and on thin materials.
Plain (No End), also known as safe end router bits, are used for edge routing and applications when no floor finish cuts are required.
Square ends are used for general milling applications, including slotting, profiling and plunge cutting.
Center-cutting router bits are designed with a straight flute and used for general-purpose milling applications. Commonly used on fine milling of metals or milling of nonferrous exotic materials including Carbon Fiber Reinforced Plastic (CFRP).
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