Mizzy Heatless Wheel — A Bench Standard for Cool Grinding
Mizzy Heatless Wheel — A Bench Standard for Cool Grinding
Silicon-carbide wheels designed to remove material without thermal damage
The Mizzy heatless wheel is a silicon-carbide grinding wheel designed for use at the jeweller's or lapidary's bench, formulated to minimise heat generation during grinding and thereby to allow rapid material removal without the thermal damage that aggressive grinding can cause. The wheels are widely used for shaping castings, dressing bezels, removing solder seams, and similar bench-grinding tasks where speed is desirable but excessive heat would risk damaging adjacent stones, soldered joints, or hardened components.
How they work
The Mizzy formulation combines silicon-carbide abrasive grit with a bond designed to release particles efficiently as they wear, exposing fresh sharp grit and avoiding the polishing-over that causes generic abrasive wheels to lose effectiveness and to generate heat through friction. The combination of efficient grit exposure and the bond's heat-dissipation characteristics means that the wheel can remove material aggressively without the workpiece reaching the temperatures that would cause discoloration of metal, damage to adjacent stones, or distortion of the workpiece geometry.
The wheels are available in a range of grits from coarse (for bulk material removal on castings) through medium (for general bench shaping) to fine (for finishing operations preparatory to polishing). Standard mounting fits standard bench-motor mandrels and flexible-shaft handpieces. Diameters range from small mounted points for use in flexible-shaft handpieces to bench-wheel sizes mounted on a fixed motor.
Use at the bench
The most common bench application is shaping cast jewellery components — removing sprues, dressing the cast surface, shaping bezels, and similar tasks that require rapid stock removal. The Mizzy wheel allows the bench jeweller to work efficiently without constantly stopping to allow heat to dissipate. For setting work, the wheels can be used to dress prong tips and to shape bezels around set stones, with the heatless characteristic protecting the stone from thermal stress.
Eye protection and dust extraction are essential. Silicon-carbide grinding generates fine abrasive dust that is hazardous if inhaled and can cause significant eye irritation if not contained. Bench-grinding work should be conducted with appropriate PPE and with extraction or fume-hood ventilation.
In the trade
Mizzy heatless wheels are one of several specialty bench-grinding products in the contemporary jeweller's tool inventory. Other manufacturers — Pacific Abrasives, Norton, and others — offer comparable products with slightly different formulations. The choice between manufacturers is largely a matter of individual preference, with most experienced bench jewellers settling on a preferred brand and grit range that suits their typical work.