8" x 1-1/2" 280 Grit Lapidary Diamond Hard Flat Grinding Wheel

The 8" x 1-1/2" 280 Grit Lapidary Diamond Hard Flat Grinding Wheel provides ultra-precise pre-finishing and surface refining for 8-inch vertical cabbing units and bench grinding machines. Built on a precision-turned solid steel core electroplated with uniform 280-grit monocrystalline diamonds, this hard wheel delivers true, vibration-free rotation and sharp dimensional stability. It effortlessly removes 180- and 220-grit scratch patterns while maintaining flat facets, crisp outlines, and smooth cabochon girdles across agate, jasper, quartz, jade, ceramic, and art glass.

Key Features

• Precision Steel Core Construction: Heavy-duty turned steel core ensures zero runout, absolute planar stability, and vibration-free operation at 1400–1800 RPM.
• Consistent Electroplated Diamond Layer: High-density 280-grit diamond particles are firmly nickel-electroplated across the entire face for uniform wear and scratch-free pre-finishing.
• Surface Smoothing & Scratch Removal: Effortlessly erases coarser grinding marks, transitioning workpieces seamlessly into soft resin sanding and diamond polishing steps.
• True Flat Profile: Delivers sharp 90-degree corners and flat, uniform grinds on slabs, preforms, and cabochon girdles.
• Standard 1" Arbor with Reducer Bushings: Bored to 1" and supplied with precision bushing spacers to adapt seamlessly to 3/4", 5/8", and 1/2" machine arbors.

Applications

• Gemstone Cabbing & Pre-Polishing: Refining cabochon dome contours and truing girdle flats on agate, jasper, quartz, petrified wood, and jade.
• Glass Cold Working & Beveling: Smoothing cut edges, beveling borders, and eliminating chip marks on art glass projects.
• Ceramic & Mineral Sizing: Flattening specimen bases, fossil slabs, and dense technical ceramics with accurate control.

Technical Specifications

• Diameter: 8 inches (200 mm)
• Width: 1-1/2 inches (38 mm)
• Grit: 280 Grit (Fine Pre-Polishing)
• Core Material: Solid Steel
• Bond Type: Electroplated Diamond
• Arbor Size: 1 inch (includes 3/4", 5/8", 1/2" reducer bushings)
• Recommended Operating Speed: 1400–1800 RPM

Operating Guidelines

• Always operate with adequate continuous water coolant to keep the workpiece cool and flush swarf from the diamond surface.
• Apply light to moderate, uniform hand pressure; let the diamond cut freely without forcing the workpiece against the steel core.
• Avoid grinding on the corner edges to prevent premature diamond stripping along the rim shoulder.