Are you using the standard little red disks, the fiberglass reinforced, or the metal? I think they're all called "reinforced". It does take some practice to not waste disks, the first time I tried ...
Dremel’s 4000 is the company's most powerful corded rotary tool. As with Dremel’s 300-series, Dremel’s reputation precedes it, as Dremel rotary tools are by far the favourites among PC modders and DIY ...