Yah know... this is just for you to maybe get an idea but over on the jewelers station there's a jig that can be used to cut links for chain mail armor - and other things. You put a tightly wrapped spool of steel wire on a mandrel, then somehow use the jig to cut through the pieces that will become the links using a dremel.
Seems that you could look at it and scale that up to cut using either a jigsaw or a (my favorite) small circular saw. Make one pass on one side, then rotate 180 and cut again.
I'll be in this afternoon and get a picture of the jig/jib :) and post it here, but I'm not the expert on it.