the modern 2-stage hone is not the right tool to re-profile the knife- i have tried & failed. besides, i think its too much effort for a knife under $10 & badly chipped.
Reprofiling of knives MUST be done on a 'wet and dry' bench grinder, follow by a series of fine smoothing and touching-up on whetstones with different grit sizes.
There is simply no way you can reprofile a knife with a steel/ceramic (2-stage) hone. :nono:
i have found a general hardware store that has a piece of very fine grinding block, it's only $6, but i did not buy it as there are surface imperfection (quite a deep hollow near 1/3 of the block). does it matter? its so fine there is a layer of powder... :sweat:
In this case, that is a grinding block, not a whetstone (yes, there are differences). Professional-grade artificial whetstones are made from a composition of bonded fine ceramic, silicon carbide (carborundum) or of aluminum oxide (corundum). Most ordinary grinding stones are simply compressed and bonded fine carborundum (silica carbide) powder. They are much harder and more coarse. Professional-grade whetstones will sharpen your knife more evenly, thus your blade will feels and cuts smoother.
I personally use Japanese whetstones. These stones are to be used with water as lubricant (using oil on a whetstone is deleterious to the stone).
Japanese stones are softer and have a few advantages over harder stones. First, because they are softer they do not become glazed or loaded with the material they are sharpening. New particles are constantly exposed as you work with them and thus they continue to cut consistently. Second, they can be lubricated effectively with water (rather than oil, which can ruin the stone) so nothing but water is required. Finally, because they are soft, the worn material and the water form a slurry which in conjunction with the stone, sharpens and polishes the blade. The disadvantage is that they wear out faster than other types of sharpening stone, although this makes them easier to flatten.
As for natural whetstones, although there is a certain amount of romance associated with them, there are also some drawbacks. First, over hundreds of years, the best quarries have given up much of their best stone. This scarcity causes high prices for a good quality consistent stone. Lesser quality stones have problems of consistency and may have occasional larger pieces of grit or soft spots.
Although there is a certain amount of romance associated with using stone which is found naturally, there are also some drawbacks. First, over hundreds of years, the best quarries have given up much of their best stone. This scarcity causes high prices for a good quality consistent stone. Lesser quality stones have problems of consistency and may have occasional larger pieces of grit or soft spots. With this in mind, and with modern technologies, artificial stones came to the market. There have been a variety of formulations over the years and the quality of artificial stones continues to increase.
According to Wikipedia.com, one of the most revered natural whetstones is the yellow-gray Belgian coticule, which has been quarried for centuries from the Ardennes. The slightly coarser and more plentiful "Belgian blue" whetstone is found naturally with the yellow coticule in adjacent strata; hence two-sided whetstones are available, with a naturally occurring seam between the yellow and blue layers. These are highly-prized for their natural elegance and beauty, as well as for providing both a fast-cutting surface for establishing a bevel and a higher-grit surface for refining it.
The most common natural whetstones available in Singapore are Arkansas stones. These stones come in medium-coarse to fine grit size (from about 400 to 1,000), and are relatively pricey. These stones do take more effort to sharpen your blades compared to Belgian coticule, and the finishing is not as refine.