Product Description
The CMT 140.159.61 Diamond Compression Bit is a premium polycrystalline diamond (DP) router cutter engineered for CNC machines that demand clean, chip-free cuts on both faces of composite panels and fiber-reinforced materials. Built with a compression spiral geometry that shears simultaneously upward and downward, this 5/8 in. diameter bit delivers finish-quality edges on demanding substrates like fiberglass, carbon fiber, and solid surface materials - eliminating the tearout and delamination that conventional spiral bits can leave behind. With a 1 + 1 cutting edge configuration (5DP + 1HW) and super strength steel body, this right-hand rotation cutter is designed for high-performance CNC routing where surface quality and tool longevity are non-negotiable.
Key Features
- Diamond (DP) Cutting Edge with 1 + 1 Configuration (5DP + 1HW) - polycrystalline diamond cutting edges maintain sharpness far longer than standard carbide when routing abrasive composite panels, carbon fiber, and fiberglass, reducing downtime from frequent tool changes.
- Compression Spiral Geometry with Shear Angle - cuts upward and downward simultaneously, producing clean, chip-free surfaces on both the top and bottom face of the workpiece in a single pass - critical for laminated and composite panel work where tearout on either face is unacceptable.
- Super Strength Steel Body - provides a rigid, vibration-resistant platform that supports the diamond cutting edges and contributes to dimensional accuracy and consistent cut quality during heavy-duty CNC routing cycles.
- 5/8 in. Diameter x 1 49/64 in. Cutting Height - the generous cutting height accommodates a wide range of panel thicknesses in a single pass, reducing the need for multiple depth adjustments and improving throughput on production CNC setups.
- 5/8 in. x 50mm Shank - the robust shank dimensions ensure a secure, stable collet grip in CNC router spindles, minimizing runout and extending the usable life of both the bit and the collet.
- Right-Hand (RH) Rotation - compatible with the standard spindle direction of CNC routing machines, router tables, and handheld routers, enabling straightforward drop-in use without spindle reconfiguration.
- 4 1/16 in. Total Length - provides sufficient reach for deep fixture clearance and toolholder engagement while keeping the bit rigid enough to resist deflection under load.
Why This Product
- Composite panel fabricators working with fiberglass, carbon fiber, and solid surface materials need a bit that resists rapid dulling - the polycrystalline diamond (DP) cutting edges in this compression bit are specifically suited to abrasive, hard-to-machine substrates where carbide-tipped tools wear quickly and require frequent replacement.
- Double-sided laminate and composite panel work requires perfectly clean edges on both faces simultaneously - the compression shear angle geometry achieves this in a single CNC pass, eliminating the secondary trimming or sanding steps that add time and labor cost.
- The 1 + 1 cutting edge design (5DP + 1HW) balances the extreme hardness of diamond with a tough supporting geometry, giving the bit durability against the high cutting forces common in industrial CNC routing of reinforced materials.
- At 5/8 in. diameter with a matching 5/8 in. x 50mm shank, this bit is sized for professional CNC router spindles where rigidity and minimal runout directly translate to tighter tolerances and superior edge finish on finished parts.
Specifications
- Manufacturer Part Number: 140.159.61
- Brand: CMT Orange Tools
- Product Type: Diamond Compression Router Bit
- Diameter: 5/8 in.
- Cutting Height: 1 49/64 in.
- Total Length: 4 1/16 in.
- Shank: 5/8 x 50mm
- Number of Teeth: 1 + 1
- Cutting Edge Material: DP (Polycrystalline Diamond) - 5DP + 1HW
- Body Material: Super Strength Steel
- Rotation: Right-Hand (RH)
- Class: RCDP
Approved Applications
- CNC routing of composite panels
- Cutting fiber-reinforced materials including fiberglass and carbon fiber
- Heavy-duty CNC routing of Corian and solid surface materials
- Double-sided laminate trimming requiring chip-free finish on both faces
Frequently Asked Questions
What makes a diamond (DP) compression bit different from a standard carbide compression bit for CNC routing?
This bit uses polycrystalline diamond (DP) cutting edges - specifically a 5DP + 1HW configuration - rather than conventional solid carbide or carbide-tipped edges. Diamond is significantly harder than carbide, making it far better suited to abrasive materials like fiberglass, carbon fiber, and composite panels where a standard carbide edge dulls rapidly. The result is longer tool life, more consistent cut quality over extended production runs, and fewer tool change interruptions on the CNC machine.
What does the compression geometry with shear angle actually do during a cut?
The compression spiral geometry combines an upcut flute and a downcut flute in a single bit. As it routes through the material, the upcut portion shears the bottom face cleanly while the downcut portion shears the top face cleanly - both simultaneously. The added shear angle refines this action further, reducing cutting forces and producing smoother surface finishes. The practical outcome is a chip-free, tearout-free edge on both the top and bottom faces of the panel in one pass - eliminating the need for secondary cleanup operations.
What CNC machines and setups is the 5/8 in. shank compatible with?
The 5/8 in. x 50mm shank is sized for CNC routing machines, router tables, and handheld routers equipped with a 5/8 in. collet. The right-hand (RH) rotation is standard for the vast majority of CNC router spindles. Always verify that your machine's spindle speed range is appropriate for the bit diameter and the specific material being cut before beginning a routing operation.
What materials is this diamond compression bit designed to cut?
This bit is engineered for hard, abrasive composite and fiber-reinforced materials including fiberglass, carbon fiber, Corian, solid surface materials, and composite panels. The polycrystalline diamond cutting edges are specifically chosen for these substrates because their extreme hardness resists the rapid abrasive wear that would quickly degrade a conventional carbide edge in the same applications.
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