A compression bit combines upcut and downcut cutting geometries in one router bit. The opposing cutting forces direct material toward the center of the panel, helping produce clean edges on both the top and bottom surfaces.
CNC Compression Carbide Insert Bit-Opposite Shear
In stock
Price range: $658.00 through $689.00
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Series 6243
With two solid carbide insert tips shearing downward and 2 inserts shearing upward the 6243 series provides a chip free surface finish on laminated panel products as well as solid wood for jointing, trimming and sizing. The upper and lower inserts are interchangeable as are the bottom and peripheral cutting knives. Economically priced cost-saving alternative to 3/4″ diameter solid carbide compression bits. Get up to 30% longer tool life by ordering this tool on an HSK heat shrink tool holder for accuracy that surpasses a standard tool holder and collet.
Typical Machining Range:
16,000-18,000 RPM
250-350″/min.
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CNC Compression Carbide Insert Bit-Opposite Shear
Product FAQs
Compression bits are commonly used for plywood, melamine, laminated particleboard, MDF, veneered panels and other sheet materials where clean edges on both faces are required.
The upcut portion helps produce a clean bottom edge, while the downcut portion helps prevent chipping on the top surface. When the material is positioned within the compression zone, both faces can be machined cleanly in a single pass.
The upcut portion must remain within the thickness of the material for true compression cutting. If the upcut section extends above the top surface, it can cause chipping or tear-out on the top edge. For machining on a flat table/spoilboard, a shorter upcut is preferable (usually +/- 3/16″).  For Pod/Rail machines, a longer upcut, such as 5/16″ is appropriate.
Yes. Through-cutting laminated and veneered panels is one of the primary applications for compression router bits because the geometry is designed to produce clean top and bottom edges simultaneously.
Choosing the correct compression bit involves more than selecting the right diameter and cutting length. Material, panel thickness, feed speed, flute configuration, upcut length and carbide grade all influence tool performance and tool life.
A common misconception is that a 3-flute compression bit produces a better finish than a 2-flute tool. It does not. The primary advantage of a 3-flute design is its ability to accommodate higher feed speeds while maintaining the proper chip load per cutting edge. This can significantly increase productivity on CNC machines capable of higher feed rates.
Carbide grade is equally important. GDP Tooling offers compression bits manufactured from three different carbide grades using different binder compositions, allowing the cutting material to be matched more closely to the material being machined. For this reason, we differentiate between compression tools optimized for MDF, melamine and solid wood, rather than treating all compression bits as interchangeable.
Panel thickness and upcut length must also be considered. For clean top and bottom edges, the upcut portion of the tool must remain below the top surface of the material so that the compression geometry functions correctly.
