Made a slitting saw arbor with a 3/4" shank for 1" arbor saw blades. Started from a 1.5" bar of 1144, so ended up with a lot of chips. Micro-mark 7x16 with carbide tooling; actually seemed to work out fairly well despite all the horror stories you hear. This might have been my smoothest project yet - writing up a plan beforehand helped a lot.