Shop

Key Features

CBN Abrasive CoreCubic boron nitride is one of the hardest abrasives made. It cuts steel teeth fast and wears far slower than a standard grinding wheel.Runs Off Your DrillChuck the shaft in a drill at medium speed and the grinder does the work. No bench grinder or dedicated sharpening station needed.Blades Up to 52mmThe slot accepts oscillating multi-tool blades up to 52mm wide, so it handles the common plunge and wood blade sizes.

Overview

The Byrne CBN Gear Grinder (model BN-GG-CBN52) is a blade sharpener for oscillating multi-tool blades. This is a drill-driven sharpening tool designed for restoring the teeth on worn plunge-cut and wood blades so they cut cleanly again instead of heading to the scrap bin.

Inside the aluminum alloy housing is a cubic boron nitride (CBN) abrasive. CBN is second only to diamond in hardness and is the go-to abrasive for sharpening hardened steel. It holds its shape and keeps cutting over hundreds of passes, which is why it delivers consistent results where a cheap stone glazes over and loses its edge.

Operation is simple. Clamp the drive shaft in a drill chuck, run the drill at medium speed, and feed the blade teeth into the slot. The grinder restores a serrated, even edge across the full width of the blade. Byrne rates it for blades up to 52mm wide, and it sharpens at any angle you present the blade, so you can match the original tooth geometry.

The housing is compact and stable, which keeps the blade square to the abrasive and makes the results repeatable blade after blade. At 0.6 kg (about 1.3 lb) packaged, it lives in a drawer or a systainer without taking up real estate.

Who should buy this: remodelers, trim carpenters, flooring installers, and anyone burning through oscillating blades for undercutting jambs, plunge cuts in subfloor, or cutting out drywall. If you toss a dull blade every few days, the CBN Gear Grinder pays for itself quickly.

Bring Dull Blades Back to Work

A resharpened blade plunges straight and cuts clean again instead of burning and wandering through the wood.

• Restores a serrated, even tooth line
• Extends the life of plunge-cut and wood blades

Sized for Multi-Tool Blades

The slot guides the blade squarely onto the CBN abrasive so every tooth gets the same treatment.

• Accepts blades up to 52mm wide
• Sharpen at whatever angle the tooth geometry needs

What’s in the Box

• (1) CBN Gear Grinder

Drill not included.

Key Specifications

Built For

RemodelingCarpentryFlooring InstallationDrywallWoodworkingDIY / Hobbyist

Pro Tip

Run the drill at medium speed, not full throttle. Let the CBN cut, keep the blade moving across the slot, and stop to check the teeth often. Too much speed and pressure heats the tooth tips and softens the steel.

Tool Nut’s Take

Tool Nut’s Take

Stop Throwing Away Oscillating Blades

The Byrne CBN Gear Grinder turns a dull multi-tool blade back into a working blade using the drill already in your bag.

• Who it’s for: Remodelers and trim carpenters who chew through oscillating blades on a weekly basis.
• Why it stands out: A CBN abrasive that outlasts ordinary stones, plus a slot that keeps the blade square for repeatable results.
• Worth knowing: It sharpens steel teeth. Carbide-tipped or diamond grit blades are a different animal and are not what this tool is built for.

Common Questions

• What powers the CBN Gear Grinder? A standard drill. Chuck the drive shaft and run it at medium speed.
• How wide a blade will it take? Blades up to 52mm wide.
• What is CBN? Cubic boron nitride, a super-hard abrasive used for sharpening hardened steel. It wears much slower than conventional grinding media.