Yeah, sometimes ya gets lucky with "budget" purchases, other times ya gets what ya pays for...
As for "grinding" safe edges, I recommend doing it by hand and not on a grinding wheel. It's very easy to overheat the file and lose its temper.
When I've done safe edges, I do them on a carborundum stone followed by 600 through 1200 wet/dry sandpaper (dry) then polish with a just drop or two of machine oil on 2000.
I know I've seen YT vids of people using surface grinders and other power tools, but I was advised against it some years ago and just stuck to doing it by hand. It's not like it's a job I do a lot of or often, so the elbow grease doesn't worry me and it doesn't take that long really.
I've only done 3-4 jeweller's files, and all my other files are purpose-made for fretwork.
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