Product Description
The CMT 140.190.61 Diamond Compression Bit is a professional-grade CNC router cutter engineered for clean, chip-free cutting on both faces of composite panels, fiber-reinforced materials, and solid surface substrates. Built with a 3/4 in. diameter and 3/4 in. shank, this right-hand rotation bit features a compression spiral geometry that drives material fibers simultaneously upward and downward, eliminating surface tearout on top and bottom faces in a single pass. With diamond (DP) cutting edges arranged in a 1+1 configuration - three DP segments plus one solid carbide segment - this bit delivers exceptional edge retention and durability in abrasive CNC routing applications where standard carbide tooling wears prematurely.
Key Features
- Diamond (DP) Cutting Edges in a 1+1 Configuration (3DP + 1HW) - the polycrystalline diamond cutting edges provide dramatically longer tool life than standard carbide when routing abrasive composite panels, fiberglass, carbon fiber, and Corian, reducing downtime and replacement frequency in production environments.
- Compression Spiral Geometry with Shear Angle - the opposing upcut and downcut spirals work together to hold the workpiece firmly and cut both surfaces cleanly simultaneously, eliminating the need for secondary sanding or finishing on composite panel edges.
- 3/4 in. Shank (3/4 x 50mm) - the large-diameter shank maximizes rigidity and minimizes deflection under load, resulting in straighter cuts, reduced vibration, and improved surface finish quality during high-feed CNC routing passes.
- 1 in. Cutting Height - sufficient depth of cut for full-thickness passes through standard composite panel stock, allowing complete profile cuts in a single operation rather than requiring multiple stepped passes.
- Super Strength Steel Body - the high-grade steel tool body resists flex and stress fracture under the demanding feed rates and spindle speeds typical of CNC production routing, supporting consistent performance over an extended service life.
- Right-Hand (RH) Rotation - compatible with standard CNC router spindles and router table setups that run conventional right-hand tooling, making this bit a direct-fit upgrade for existing CNC operations routing abrasive materials.
- Total Length of 3-11/32 in. - the generous overall length provides adequate clearance between the router collet and the workpiece surface, supporting use in a wide range of CNC gantry and router table setups without interference.
Why This Product
- Composite panels and fiber-reinforced materials destroy standard carbide bits quickly - the polycrystalline diamond cutting edges on this bit are specifically engineered to handle abrasive substrates like fiberglass, carbon fiber, and Corian without rapid edge degradation.
- Tearout on composite panel faces is a common and costly finishing problem - the compression spiral geometry cuts upward and downward at the same time, producing chip-free top and bottom surfaces in a single CNC pass and eliminating rework.
- The 3/4 in. shank paired with a super strength steel body gives this bit the rigidity needed for aggressive CNC feed rates in production routing, reducing deflection and chatter that can ruin edge quality on expensive composite stock.
- The 1+1 cutting configuration (3DP + 1HW) balances diamond hardness with solid carbide support, giving this CNC router bit the toughness to maintain accurate cut dimensions through long production runs on abrasive sheet goods.
Specifications
- Manufacturer Part Number: 140.190.61
- Brand: CMT Orange Tools
- Product Type: Router Cutter
- Diameter: 3/4 in.
- Cutting Height: 1 in.
- Total Length: 3-11/32 in.
- Shank: 3/4 x 50mm
- Number of Teeth: 1 + 1
- Blade Material: DP (Diamond / Polycrystalline Diamond)
- Cutting Edge Configuration: 3DP + 1HW
- Rotation: Right-Hand (RH)
Approved Applications
- CNC routing of composite panels
- Cutting fiber-reinforced materials including fiberglass and carbon fiber
- Routing Corian and solid surface materials
- Heavy-duty production CNC routing of abrasive sheet goods
- Router table use with compatible 3/4 in. shank collets
Frequently Asked Questions
What makes this a "compression" bit and why does it matter for composite panels?
A compression bit uses opposing spiral directions - one cutting edge pushes chips upward while the other pushes chips downward. This simultaneous action compresses the material from both faces during the cut, which prevents surface tearout on the top and bottom of composite panels. The result is a finish-quality edge on both faces without secondary sanding or edge treatment.
What does the "1+1 (3DP + 1HW)" cutting edge configuration mean?
The 1+1 designation refers to two cutting edge groups - one upcut and one downcut - that together form the compression geometry. Within those edges, three segments are tipped with polycrystalline diamond (DP) for extreme wear resistance on abrasive materials, while one segment uses solid carbide (HW) to provide structural support and toughness. This combination delivers the hardness needed for diamond-class materials alongside the durability of carbide backing.
What types of materials is this diamond compression bit designed to cut?
This bit is engineered for abrasive composite materials that rapidly degrade standard carbide tooling. Suitable materials include fiberglass, carbon fiber, composite panels, Corian, and other solid surface materials. The polycrystalline diamond cutting edges maintain sharpness far longer than carbide alone when routing these highly abrasive substrates in CNC production environments.
Is this bit compatible with a standard CNC router or router table?
Yes. The bit uses a 3/4 in. shank (3/4 x 50mm) and right-hand (RH) rotation, which is consistent with standard CNC router spindles and router tables equipped with a 3/4 in. collet. Confirm that your machine's collet size and spindle rotation direction match these specifications before use.
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