Cast Iron Lapping Plate is the most professional solution for sharpening stone maintenance. Known as "nagura" or "lapping plate" in the Japanese knife sharpening tradition, this tool is used for both flattening and conditioning the surfaces of your sharpening stones. Fully compatible with Shapton, this cast iron plate is one of the essential pieces of equipment for master sharpening workshops.
Why is Cast Iron Superior?
Cast iron is an ideal material for lapping plates due to its high hardness and excellent flatness. Unlike plastic or aluminum alternatives, cast iron retains its shape over time and delivers the same performance for decades. When used with sharpening powder or an abrasive slurry, its surface precisely processes the stone surface.
Two Different Use Cases
1. Stone Flattening: Used with flattening powder to restore hollowed-out sharpening stones to a flat surface.
2. Lapping (Surface Finishing): Very fine surface finishing can be achieved by using it with abrasive powder of a specific grit size. This method is especially used to flatten the back (ura) of traditional Japanese knives (yanagiba, deba).
Technical Specifications
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Material: High-quality cast iron
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Surface: Precisely machined flat surface
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Compatibility: All Shapton stones and other waterstones
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Usage: With flattening powder (wet)
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Lifespan: Lifelong with proper care
Who Is It Suitable For?
Designed for serious knife enthusiasts, knifemakers, workshop-owning sharpening masters, and those deeply exploring the Japanese knife tradition. It is a high-value investment product; the price paid quickly pays for itself with a lifetime of use.
Usage Instructions
- Sprinkle flattening powder onto the plate and add a few drops of water
- Move the sharpening stone over the plate in a figure-8 or circular motion
- Clean the surface periodically and check the progress
- For lapping, use finer powder and proceed with unidirectional movements
Care and Storage
After use, clean the cast iron surface thoroughly and dry it completely. Apply a thin layer of oil (vegetable or mineral oil) to prevent rust. Do not leave it in a humid environment — cast iron will rust in moisture. With regular care, it can be used for generations.
