RBG 7" Professional Fast Grind Lawn Mower Blade Sharpener 712

What It Is

The RBG 7" Professional Fast Grind Lawn Mower Blade Sharpener (model 712) is a benchtop sharpening tool designed for fast, consistent blade sharpening without removing the blade from the mower. It’s built for commercial landscapers and serious DIYers who sharpen multiple blades weekly.

Fitment & Compatibility

• Deck size: Works with any walk-behind mower deck (21"–60") as long as the blade is accessible from above. Not for zero-turn or riding mower decks where the blade is enclosed.
• Blade type: Fits standard flat blades up to 7" wide. Not for mulching blades, gator blades, or blades with curved/angled edges.
• Mounting: Requires a 7" grinding wheel (included) and a stable bench or stand. The unit clamps to a workbench; no mower modification needed.
• Compatibility check: Measure your blade width (edge-to-edge) – must be 7" or less. Confirm your mower’s blade bolt is accessible from the top (most walk-behinds are). Not for Honda HRX or Toro Recycler decks with deep blade wells.

Key Things to Know

• Installation difficulty: Easy setup – mount the grinder, attach the guide arm, and adjust the angle. No wiring or special tools needed.
• Quality: Heavy-duty steel frame, commercial-grade motor. Users report consistent, factory-like edge in under 60 seconds per blade. The grinding wheel lasts ~50 sharpenings.
• Gotchas: The guide arm can slip if not tightened fully; check alignment before each use. Requires eye/ear protection and a dust mask – metal filings fly. Not for sharpening dull/damaged blades (those need replacement).
• Maintenance: Clean the grinding wheel face with a dressing stick every 10 uses to prevent glazing.

Should You Buy It

Buy this if you sharpen more than 10 blades per season and value speed and precision over cost. It’s overkill for a single mower owner – a hand file or $30 drill attachment works fine. For landscapers or rental shops, the $530 price pays off in time saved and consistent edge quality.