CMT Spoilboard Surfacing Router Cutter with Insert Knives - 3-15/16 in. is a heavy-duty CNC router cutter engineered for rapid material removal across large surface areas, delivering an improved bottom-of-cut finish on soft and hardwood, particle board, and MDF. Built on a super-strength steel body and armed with 4-sided micrograin carbide inserts, this 4 in. diameter cutter is the go-to tool for CNC spoilboard resurfacing, panel flattening, and large-area facing operations where precision and economy of blade use are equally important.

Key Features

• Super-strength steel body - provides a rigid, durable platform that resists flex under the high-feed conditions typical of CNC spoilboard surfacing, keeping cuts consistent pass after pass.
• 4-sided replaceable micrograin carbide inserts - each insert offers four usable cutting edges, so when one edge dulls you simply rotate or flip the insert rather than replacing the entire cutter, dramatically reducing long-term tooling cost.
• 4 in. cutting diameter with 4 teeth - covers a wide swath in each pass, speeding up full-board surfacing and reducing the number of passes needed to flatten a spoilboard or panel.
• 12mm cutting height - allows a meaningful depth of engagement suitable for resurfacing worn spoilboards and for facing operations on particle board, MDF, and solid wood workpieces.
• Right-hand rotation (RH) - compatible with standard CNC router spindle configurations, ensuring straightforward drop-in setup without special adapters.
• 20mm shank - fits common CNC router collets and tool holders, making this cutter a practical match for a wide range of CNC router machine setups.
• Optimized for soft and hardwood, particle board, and MDF - the carbide insert geometry is selected to handle the varying densities and abrasiveness of these materials without premature edge wear.

Why This Product

• Faster spoilboard renewal at lower cost - the large 4 in. diameter combined with 4 cutting inserts means more material removed per pass, cutting resurfacing time significantly compared to smaller-diameter bits, while the rotatable 4-sided inserts keep replacement costs low.
• Improved surface finish where it counts - this cutter is specifically designed to leave an improved finish at the bottom of the cut, which means CNC workpieces rest on a truer, flatter spoilboard surface for more accurate results.
• Broad material compatibility for busy CNC shops - rated for solid softwood, solid hardwood, MDF, and particle board, this single cutter handles the most common CNC routing substrates without the need to swap tools between jobs.
• Straightforward insert serviceability - rotating or replacing individual carbide inserts is faster and more economical than regrinding or replacing a solid carbide cutter, minimizing machine downtime during production.

Specifications

• Manufacturer Part Number: 663.006.11
• Brand: CMT Orange Tools
• Product Type: Spoilboard Surfacing Router Cutter with Insert Knives
• Diameter: 4 in.
• Cutting Height: 12mm
• Total Length: 3-35/64 in.
• Shank: 20mm
• Number of Teeth: 4
• Insert Material: Super Micrograin Carbide (HW)
• Body Material: Super Strength Steel
• Rotation: Right-Hand (RH)

Approved Applications

• CNC Spoilboard Surfacing
• Large Surface Facing
• Panel Flattening
• Material Removal on Soft and Hardwood
• Material Removal on Particle Board and MDF