8" 12mm Zinc Polishing Lap

A zinc polishing lap, also known as a zinc lap, is a tool used in lapidary and gemstone polishing processes. It is a flat disc or wheel made of zinc metal that is used in conjunction with polishing compounds to achieve a high-quality polished surface on gemstones.

Here are some key features and uses of a zinc polishing lap:

Construction: A zinc polishing lap is typically made by casting or machining a solid disc or wheel using high-purity zinc metal. The disc is mounted onto a rotary machine, such as a lapidary machine or a faceting machine.
Polishing Surface: The surface of the zinc lap is flat and smooth, providing a stable and consistent platform for polishing gemstones. The flatness of the lap ensures even contact between the lap and the gemstone during the polishing process.
Polishing Compounds: Polishing compounds or powders are applied to the surface of the zinc lap to aid in the polishing process. These compounds are typically diamond or oxide-based pastes or powders that have abrasive properties. The chosen compound depends on the hardness and type of gemstone being polished.
Gemstone Polishing: A zinc polishing lap is primarily used for polishing gemstones, such as quartz, topaz, sapphire, and other harder stones. It is an essential tool in lapidary work and gemstone faceting, where it helps remove scratches, surface imperfections, and achieve a high-gloss, reflective finish on the gemstones.
Lubrication: During the polishing process, a water-based lubricant or coolant is often used to facilitate the movement of the gemstone on the lap, reduce friction, and prevent overheating. The lubricant also helps carry away debris and maintains the effectiveness of the polishing compounds.
Maintenance: To maintain optimal performance, a zinc lap requires periodic cleaning and conditioning. This involves removing residual polishing compounds, debris, and restoring the flatness of the surface. Techniques such as scraping, sanding, or using conditioning agents may be employed to restore the lap's performance.

It's important to note that zinc laps are specifically designed for polishing gemstones and are not suitable for other materials or metalworking processes. Additionally, proper safety precautions should be taken, including wearing protective eyewear and gloves, and following manufacturer instructions and guidelines when working with a zinc polishing lap and associated machinery.