8" x 2" 220 Grit Sintered Diamond Grinding Wheel – Metal Bonded for Gemstone & Glass Grinding

The 8" x 2" 220 Grit Sintered Diamond Grinding Wheel (Metal Bonded) is a professional-grade, long-lasting lapidary grinding wheel engineered for high-precision medium grinding, contour shaping, and surface smoothing on gemstone cabochons, glass cold work, and technical ceramics. Unlike standard electroplated wheels with a single abrasive layer, this wheel features a full 5mm deep solid metal-bonded diamond matrix. As the wheel wears during use, fresh diamond crystals are continuously exposed, delivering consistent cutting performance and extraordinary working life across demanding shop environments.

Key Features

• 5mm Deep Solid Sintered Matrix: Fully impregnated metal-diamond rim provides years of dependable service and far outlasts electroplated alternatives.
• Self-Sharpening Cutting Action: Continuous exposure of fresh diamond points ensures smooth, uniform stock removal with minimal chipping.
• Solid Balanced Core: Heavy-duty core provides true concentric rotation and vibration-free grinding at standard cabbing speeds.
• Wide 2" Grinding Face: Broad profile accommodates larger slabs, wide cabochons, and extensive architectural glass projects.
• Full Lifespan Dressability: Easily redressed using an aluminum oxide or silicon carbide dressing stick to unmask fresh cutting points whenever necessary.
• Universal 1" Arbor Bore: Standard 1-inch inner bore supplied with reducer bushings to fit 3/4", 5/8", and 1/2" machine shafts.

Applications

• Lapidary & Gemstone Cabbing: Medium grinding, pre-forming, dome shaping, and scratch reduction on agate, jasper, quartz, jade, and sapphire.
• Glass Cold Working: Precision edge smoothing, bevel finishing, and cold grinding on art glass and optical components.
• Ceramic & Hard Materials: Clean shaping and dimensional profiling of dense technical ceramics, porcelain, and mineral specimens.

Technical Specifications

• Diameter: 8 inches (200 mm)
• Width: 2 inches (50 mm)
• Diamond Rim Depth: 5 mm
• Grit: 220 Grit (Medium Grinding / Pre-Forming)
• Bond Type: Sintered Metal Bond
• Abrasive Material: Industrial Diamond
• Arbor Size: 1 inch (includes 3/4", 5/8", 1/2" reducer bushings)
• Recommended Operating Speed: 1400–1800 RPM

Operating Guidelines

• Continuous Wet Coolant Required: Always operate with adequate water flow to flush grinding slurry and maintain cool cutting temperatures.
• Apply light, steady workpiece pressure; allowing the diamond abrasive to cut freely prevents rim grooving.
• Traverse workpieces evenly across the wheel width to promote flat, concentric wear across the matrix face.
• Dress periodically with a dressing stick when cutting rate slows or after extensive processing of softer stones.