I cringe at the very thought of high speed abrasives being applied to quality steel. Yes, I grant you that learning to sharpen a knife using the appropriate stones takes time and practice. But I consider it a skill worth honing (pun intended). Using belt sanders and grinding wheels might work. It might even get your knives and tools sharp enough to make you happy but I encourage you to work at acquiring the skills to use stones to sharpen with. You'll be much happier with the end result and your knives and other tools will be happier as well.
Nothing ruins a knife faster than heating it up on a sander or grinding wheel. Would you use your fly rod as a walking stick? Might work, but I bet you won't like how it casts after you do so? Invest in good stones, learn or have someone knowledgeable show you how to use and care for them properly, get or make a leather strop and impregnate it with a good polishing compound and practice sharpening. Before you know it you'll be carrying razor sharp knives and be the envy of your friends and neighbors.
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