I'm no safety nut but I've got to agree with the others this just doesn't look like a setup to be doing chainsaw chains on. For the drill bits I can see it working just fine (Even though there is no kind of guard or rest...But who uses a rest when sharpening small bits?), but saw chains are pushing it a bit. With the soft backing all it would take is for one tooth to bit through the abrasive and grab the spinning wheel and I think it would become a nightmare situation in a big hurry. I've had a sharp saw chain slice right through a heavy leather glove when it got caught up on something in my bucket and I yanked it and it didn't move. I can only imagine what it would be almost as bad as being on the saw if yanked and slung around by the spinning grinder wheel, and then it would probably be alot closer to your face and body as well. Not to mention, as others have said also, if you can't keep the amount taken off of each tooth uniform then the chain will never cut right/straight like it should.
That said, for right at $130 you can get a chain sharpener from Northern Tool that does a really good job on any size chain. I actually caught mine on sale, and with a coupon, got it for under $100 a few years back. The first one on the page is nearly identical to the $300 Oregon branded one and, for the difference in price, if it only lasted half as long, would still be a heck of a deal, as they both do exactly the same thing.
Like I said I'm no safety nut and don't typically push safety issues on people. However when I see something that will certainly hurt someone if not now then definately in the future, then I will speak up because I'd rather tell them to stop now than tell them I'm sorry they got hurt later...........
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