I'm not sure I'd recommend scraping as a way to remove rust. Scraping is a fitting process, or to make a surface flat.
For removing rust from a drill press table or something like that, I'd try some penetrating oil, or plain kerosene, with a green ScotchBrite scouring pad. (n.b. get the Scotch brand ones; in my experience, the generic look-alikes aren't anywhere near as good.)
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