CNC Router Bits — Solid Carbide, Ballnose, V-Groove & Insert-Pro

CNC Router Bits for Precision Woodworking and Detail Routing

CNC router bits must handle high spindle speeds, continuous feed rates, and repetitive passes without dulling prematurely. This collection brings together two families of CNC tooling: solid carbide bits ground to tight tolerances for clean chip evacuation in profiling, carving and detail work, and Insert-Pro bits with replaceable carbide knives for large-format V-grooving, miter folding and spoilboard surfacing.

O-Flute, Ballnose, and V-Groove Options

O-flute (single-flute) bits are the standard choice for softer materials and high-feed CNC work because the large flute gullet clears chips efficiently and reduces heat buildup. The 3-piece O-Flute CNC Bit Set covers common straight-cut diameters in one purchase.

For 3D carving and surfacing operations, ballnose bits follow curved contours without leaving flat-bottomed scallop steps. Choose the standard ballnose upcut spiral for general 3D work or the tapered upcut ballnose when you need to reach into narrow recesses or produce finely tapered relief carvings. V-groove engraving bits are ideal for lettering, inlay channels, and decorative line work.

Insert-Pro CNC Router Bits with Replaceable Carbide Knives

Insert-Pro bits use solid carbide knives locked into the bit body. When an edge dulls, you rotate the knife to a fresh edge, and when both edges are spent you install a new insert, so there is no resharpening and no need to replace the whole bit. For large V-grooves and sign work, choose the 3" 90° V-groove bit (94-302), the 2-5/8" 90° V-groove bit (94-303), or the wider-angle 120° V-bit (94-301). The 91° miter-fold bit (94-300) cuts the V-groove for folded mitered corners in panels.

To keep your machine flat and true, the 2-1/2" spoilboard surfacing and rabbeting bit (94-201) and the 1-1/2" mini surfacing bit (94-200) resurface spoilboards, flatten slabs and panels, and cut clean rabbets. Replacement knives, such as the 94-302 carbide knife, are sold by bit part number. See the full lineup in the Insert-Pro CNC router bits collection.

Shank Sizes and Related Tooling

The solid carbide bits in this collection use 1/4" shanks that fit standard CNC router collets. Insert-Pro bits use 1/2" or 3/4" shanks, so confirm your spindle's collet size before ordering. For a broader selection of router bits that can also be used in CNC setups, browse the full carbide router bits collection or explore routing tools and accessories.

Frequently Asked Questions

What type of CNC router bits are best for cutting wood?

For general wood cutting on a CNC router, upcut spiral bits provide good chip clearance and are the most common choice. O-flute (single-flute) bits work well for softer woods and plywood at higher feed rates. For large V-grooves, miter folds and spoilboard surfacing, Insert-Pro bits with replaceable carbide knives are an economical choice.

What is an O-flute CNC router bit?

An O-flute bit has a single, rounded flute channel that forms an O shape in cross-section. This geometry allows exceptionally large chip loads, making it ideal for high-speed CNC passes in wood and soft materials where chip buildup can cause burning or bit breakage.

What shank size do these CNC bits use?

The solid carbide bits in this collection use 1/4" shanks, which fit standard 1/4" collets on most CNC routers and spindles. Insert-Pro bits use larger shanks. The 94-301, 94-200 and 94-201 have 1/2" shanks, and the 94-302, 94-303 and 94-300 have 3/4" shanks.

When should I use a ballnose CNC bit vs. a straight bit?

Use a ballnose bit for 3D relief carving, contoured surfaces, and any toolpath that needs to follow a curved profile. Use straight or upcut spiral bits for profile cutting, pocketing flat-bottomed recesses, and through-cuts. The ballnose upcut spiral is a good starting point for 3D work.

What is a tapered ballnose bit used for?

A tapered ballnose bit has a tapered body that narrows toward the tip, allowing it to reach into tight recesses and produce finely detailed relief carvings with less risk of the shank contacting the workpiece. It is particularly popular for decorative sign carving and 3D panels.

What materials can these CNC bits cut?

The solid carbide bits are suited for hardwood, softwood, plywood, MDF and similar wood-based materials. Insert-Pro V-groove bits are also rated for MDF/HDF, melamine, laminates, plastics, PVC, solid surface, sign board, composites and foam. For guidance, visit the Infinity Tools learning blog.

What are Insert-Pro CNC router bits?

Insert-Pro bits hold replaceable solid carbide knives in the bit body with a locking screw. When an edge dulls, you rotate the knife to a fresh edge, and when both edges are used you install a new insert. There’s no resharpening and no need to buy a new bit. Replacement knives are sold by bit part number.

Which bit should I use to surface my spoilboard?

Use the Insert-Pro 2-1/2" surfacing and rabbeting bit (94-201) for full-size spoilboards and wide panel flattening. Its 2+2 design pairs two shear-angle knives with two bottom scoring inserts. The 1-1/2" mini surfacing bit (94-200) suits smaller machines, router sleds and square-edge rabbets.

How do I maintain and clean CNC router bits?

Remove pitch and resin buildup from bit flutes using a bit-cleaning solution and a soft brush after each session. Inspect the cutting edge under magnification for chips or dullness. Sharp bits produce cleaner cuts and reduce spindle load; dull bits increase heat and tear-out.

Does Infinity Tools ship CNC router bits quickly?

Yes. Items in stock ship promptly from Infinity Tools. Review the shipping policy for current processing times and carrier options.

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