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Tormek is fully focused on sharpening. All the product development, engineering work and production are made in Sweden. The company is located in Lindesberg, a small town in the heart of Bergslagen with a history in mining. The production is carried out in close cooperation with selected suppliers, all specialized and the best in their fields. This ensures the highest quality and a continuous access to the best and most modern manufacturing technology.
You can´t determin that, there are different charts and standards which makes it impossible to compare. When using the surface it will change immediately due the cracking of the sharpening particles. This is also influenced by the pressure and sharpening angel. After truing the surface is for example very aggressive and gets finer, and a fine adjusted grid with the SP-650 Stonegrader is getting after a while more coarse.
I hope I could answer your question.