it can work o.k. problem is the grit on the tool. its usually really rough, and very small. the sander tool actually works o.k for touch up in very small areas. it will not work for sharpening or grinding an entire blade over two inches, but somtimes it can be very usefull in tight spots, or really small parts.
In my experience, it's just to hard to control the Dremel. I'm no brain surgeon so I don't have incredibly steady hands, but boy when that thing gets away from you a little ... it REALLY can make a mess.
Before I tried a Dremel I would recommend you look into one of the small Harbor Freight Sanders with some really fine belts from Lee Valley. That machine will do a quick job once you learn and is MUCH more forgiving of slight mistakes or miscaculations than a Dremel.
I wouldn't recommend using a Dremel, but if you do, use the sanding drum or discs, probably a very fine grit, and if it is variable speed I'd start as slow as possible. Make sure you don't use a grinding attachment. Yes, I think the lawn mower blade sharpener is a grinding cylinder, but that's a lot different than a knife. You could ruin the blade very, very quickly.
Bottom line...there are much better tools out there to sharpen your blades. I'm just saying.
I've only used a rotary tool once on a knife, to repair a big chip that came out of a parang after some chopping. While I can't recommend using such tools for everday sharpening or smaller blades, it DID take said blade from ruined to functional again in a fairly short time. :thumbup:
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