share. In extreme cases a stone that is dark grey, greenish or brown turns out to be beige or nearly white after cleaning. You may need to clean the stone, as the current appearance of many old stones may often, in fact, completely mask their true appearance. If you don’t have a whetstone just laying around for some reason, you’ll need to buy one! Step 3: Rub the waterstone over the lapping plate or flattening stone. I continued my 'research', lapped my 1k stone against it, wow, lapped incredibly smoothly, 600 grit stone lapped pretty slowly, barely touched the 400 grit stone, my 220 grit stone started lapping the Washita as was evidenced by the white slurry running off the stone. Step 2: Getting the stone wet. The metal lapping plate selected depends upon the desired material removal rate, the surface finish desired, the hardness of the You need a whetstone, a knife, stone base or towel, paper, water and cloth to clean the blade. save. 3 comments. You must know how long to soak whetstone. Lapping and polishing processes are performed on a hard, metal plate used in conjunction with abrasive suspensions such as diamond, silicon carbide (SiC), aluminum oxide (Al2O3), or boron carbide (B4C). The stone is polished either with dabs of diamond compound or lines of a cerium oxide slurry placed on the felt pad. While using plenty of water (running tap water is ideal) move the waterstone over the lapping plate in a random circular motion covering the entire surface of the stone. If running water is not an option, make sure your stones are sufficiently wet. 5 to 10 minutes is enough to soak it properly. The stone is washed free of all grit and dust and a felt polishing pad is placed on the master lap. Choosing Your Whetstone. " Suehiro Coarse Lapping stone Whetstone Flatten tool 2B006 Grit #280 Blue " and the" Suehiro Diamond plate Combo dressing stone Lapping stone grit 150 / 500 "If they are additional products i am not aware of that might be better i wouldn't mind knowing about that as well. Though "whetstone" is often mistaken as a reference to the water sometimes used to lubricate such stones, the term is based on the word "whet", which means to sharpen a blade, not on the word "wet". The verb nowadays usually used to describe the process of using a sharpening stone is to sharpen, but the older term to whet is still sometimes used. Without getting too technical, the smaller the number, the coarser the stone. I don't know what purpose this stone will have, except as a sanding block. Terminology. When there are no air bubbles on water, your stone has absorbed the maximum amount of water. It means the stone is ready to use. We recommend buying a double-sided whetstone that’s 6,000 grit on one side and 1,000 grit on the other. Here's roughly the same patch of one of mine before and after cleaning and lapping!