Product Description
The CMT 140.128.61 Diamond Compression Bit is a precision-engineered router cutter designed for CNC machining of composite panels, fiber-reinforced materials, and solid surface materials. Built with a diamond (DP) cutting edge and a compression spiral geometry, this 1/2 in. diameter bit cuts both the top and bottom faces of a workpiece cleanly in a single pass - eliminating delamination, tear-out, and fraying on demanding abrasive materials. The super strength steel body and DP cutting edges make it the go-to choice for production CNC routing where tool longevity and surface quality are critical.
Key Features
- Diamond (DP) Cutting Edge - delivers extreme hardness and wear resistance when routing abrasive composite panels, fiberglass, carbon fiber, and similar materials, significantly extending tool life between changes
- Compression Spiral Geometry (1+1 cutting edges: 4 DP + 1 HW) - cuts upward from the bottom and downward from the top simultaneously, producing chip-free, finish-quality faces on both sides of the workpiece in a single CNC pass
- Super Strength Steel Body - provides rigidity and stability at high CNC spindle speeds, reducing vibration and maintaining dimensional accuracy throughout the cut
- 1/2 in. Shank Diameter - fits standard CNC router collets and router table setups, ensuring secure tool holding and minimizing runout during operation
- Right-Hand (RH) Rotation - compatible with the vast majority of CNC routing machines and handheld routers, no spindle modification required
- 1 3/8 in. Cutting Height - provides sufficient depth capacity for routing composite panels and solid surface materials in typical production thicknesses
- 3 11/32 in. Total Length - designed for proper reach and clearance in CNC tool holders without compromising rigidity
Why This Product
- The diamond (DP) cutting material is specifically matched to abrasive composites, fiberglass, and carbon fiber - materials that rapidly dull standard carbide bits, making this bit the right tool where durability matters most in production environments
- The compression geometry solves the common problem of face delamination and splintering on composite panels by applying opposing cutting forces that clamp the material from both sides, delivering clean edges without secondary finishing
- With 1+1 cutting edges (4 DP + 1 HW), the bit combines the wear resistance of diamond with the geometry needed for a true compression cut - giving CNC operators both longevity and surface quality in one tool
- The 1/2 in. shank paired with a super strength steel body reduces deflection during heavy-duty CNC routing passes, contributing to consistent cut quality and repeatability across large production runs
Specifications
- Manufacturer Part Number: 140.128.61
- Brand: CMT Orange Tools
- Product Type: Diamond Compression Router Bit (CNC)
- Material: DP (Diamond) cutting edge, super strength steel body
- Diameter: 1/2 in.
- Cutting Height: 1 3/8 in.
- Total Length: 3 11/32 in.
- Shank Diameter: 1/2 in.
- Number of Teeth: 1 + 1 (4 DP + 1 HW)
- Rotation: Right-Hand (RH)
- Shear Angle: Yes
Approved Applications
- CNC routing of composite panels
- Cutting fiber-reinforced materials
- Routing fiberglass and carbon fiber
- Machining solid surface and Corian-type materials
- Heavy-duty CNC production routing
Frequently Asked Questions
What makes a diamond compression bit different from a standard carbide compression bit?
A diamond (DP) cutting edge is significantly harder than standard carbide, making it far more resistant to the abrasive wear caused by materials like fiberglass, carbon fiber, and composite panels. While a carbide bit may dull quickly on these materials, the DP cutting edge of the CMT 140.128.61 is engineered to maintain sharpness through longer production runs. The compression geometry - cutting upward and downward simultaneously with 1+1 cutting edges - also ensures clean faces on both surfaces of the panel in a single pass.
What materials is this bit designed to cut?
This bit is designed for abrasive and composite materials including fiberglass, carbon fiber, composite panels, and solid surface materials. The diamond (DP) cutting edge is specifically suited to materials that would prematurely wear conventional carbide tooling. It is not a general-purpose wood router bit.
Will this bit fit my CNC router or router table?
The CMT 140.128.61 has a 1/2 in. shank diameter, which is a standard collet size on most CNC routing machines and router tables. It rotates right-hand (RH), which matches the spindle direction of the vast majority of CNC routers and handheld routers. Always confirm your machine accepts a 1/2 in. shank before installing.
What does the "1+1" tooth count mean on this compression bit?
The "1+1" designation refers to the compression spiral configuration: one cutting edge with an upward spiral and one with a downward spiral, working together to apply cutting forces toward the center of the material from both faces. On this bit, the cutting edges consist of 4 DP (diamond) segments plus 1 HW (hardmetal/carbide) element, combining diamond wear resistance with the structural geometry needed for a true compression cut.
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