8" x 1-1/2" 220 Grit Sintered Diamond Grinding Wheel (Metal Bonded)

The 8" x 1-1/2" 220 Grit Sintered Diamond Grinding Wheel (Metal Bonded) is a professional-grade lapidary smoothing and pre-polishing wheel engineered for standard 8-inch vertical cabbing units and industrial glass beveling equipment. Built with a continuous 5mm deep solid sintered diamond layer fused in an abrasive-resistant bronze matrix, this wheel delivers consistent surface refinement across agate, jasper, quartz, jade, and architectural glass. Operating as an essential transition stage, 220 grit removes preceding grinding gouges while leaving an ultra-smooth, uniform satin texture ready for resin sanding or diamond paste polishing.

Key Features

• Continuous 5mm Solid Sintered Matrix: Fully impregnated with premium 220-grit monocrystalline diamonds throughout the entire 5mm bronze rim for decades of reliable use without risk of peeling.
• Fine Pre-Polish Smoothing: Refines surface contours and removes 100/180-grit scratches, substantially reducing subsequent resin wheel prep time.
• Self-Sharpening Cutting Action: Continual microscopic erosion of the bronze alloy exposes fresh, unrounded diamond edges during wet grinding.
• True-Running Steel Hub: Precision-balanced steel core guarantees whisper-quiet, vibration-free rotation at 1400–1800 RPM, protecting cabbing machine spindle bearings.
• Standard 1" Arbor with Reducer Bushings: Includes precision-machined bushing set to fit 3/4", 5/8", and 1/2" arbors easily.

Applications

• Cabochon Refinement & Pre-Polishing: Smoothing preformed cabochon domes and calibrating girdles on agate, jasper, quartz, petrified wood, and jade.
• Cold Glass Smoothing & Beveling: Removing coarse saw kerfs and preparing edges on stained, fused, or blown glass artwork.
• Mineral Specimen Surface Preparation: Flattening and smoothing display face surfaces and crystal nodules prior to fine resin lapping.

Technical Specifications

• Diameter: 8 inches (200 mm)
• Width: 1-1/2 inches (38 mm)
• Grit: 220 Grit (Fine Pre-Polish)
• Diamond Layer Depth: 5 mm
• Arbor Size: 1 inch (includes 3/4", 5/8", 1/2" reducer bushings)
• Bond Type: Sintered Metal (Bronze Matrix)
• Recommended Operating Speed: 1400–1800 RPM

Operating Guidelines

• Always supply adequate water coolant across the wheel face to prevent heat build-up and sweep away stone swarf.
• Maintain light, steady hand pressure against the wheel; excessive force is unnecessary and can cause uneven rim wear.
• If the cutting face becomes glazed from soft mineral swarf, recondition with an aluminum oxide dressing stick under water lubrication.