Flush-Trim Router Bits as the name suggests these bits are used to trim the edge of one material flush with the edge of another– for example, trimming a veneered surface flush with a substrate or using a pattern to create multiple identical pieces. These bits are also used to cut out pattern templates. They usually are guided by a pilot bearing that’s the same diameter as the cutter. The bearing may be at the top, bottom, or top and bottom of the bit.
What are the first router bits you should purchase to use with your router? if you're new to routing, the hundreds of options can be confusing. How do you choose? Here's what you need to know to choose the best router bits for your woodworking projects.
Router Bit Shanks
The router bit shank is the solid, cylindrical part of a router bit. It's the part of the bit that goes into the collet of the router. There are two common sizes of router bit shanks: 1/4" and 1/2". They provide better stability with less vibration, and they typically produce a smoother cut and have longer cutter life. Except for very small and very large profiles, router bits typically are available in both shank diameters.
Router Bit Cutting Edges
Most router bits have cutting edges made from high-speed steel (HSS) or carbide tips fused to the bit. Most of the profile bits will have carbide cutters, which are harder than steel and will hold an edge longer – 10 to 25 times longer – but also are more brittle. So while carbide-tipped bits are preferable, you must handle and store them carefully to avoid chipping the cutters.
Signs of Quality
High-quality router bits have carbide cutters that have been sharpened to a fine edge and that are thick enough to allow for multiple regrindings. The brazing that joins the carbide tip to the bit will appear even. And high-quality bits will incorporate a design that minimizes the risk of workpiece kickback. These anti-kickback bits have more body mass, and their enlarged bodies prevent the bits from biting too deeply and catching on to the material. The greater body mass also helps to dissipate heat and keep the bits sharp longer.
SpeTool currently offers flush trim router bits with a 1/4" shank, and a 1/2" shank will be available soon. The SpeTool flush trim bit is made of carbide material, with industrial-grade quality, smooth operation, and smooth trimming. You deserve to have it!
