I cut power supply bundles with a cutoff wheel. Slices through quick and easy.



As for chiseling things off...don't know if it would work, but they make scraper attachments for reciprocating saws. Might be able to use it like a chisel, or cut down a used blade and make a chisel out of it. Though holding a saw for hours will get tiresome. What about a dremel with a cutoff?

Some people use a paper cutter for ribbon wire. I use scissors.