Flywheel Fun...

I don't have access to a lathe this weekend.. sucks Machine Shops are about gone. But getting one turned between now and Sat is kinda a tall order... what's the worst that could happen, if I hang it from a wire , and have someone turn it while I hit it w/ a grinder? Will it eat the disc too soon? Crack the flywheel under heat? If it's not gonna be safe, I can't, even helping someone out that's down, put it in, and say go. That's not me, and I just ain't that way