Hi Rich
As Ron has already mentioned, it is pretty straightforward. I have been turning interlocked rings for years. I turn several captive rings on each goblet. I do this in case one or two breaks irreparably. Once they are all turned, and the goblet is finished, I break one, and glue it back together around the other ring and the stem of the goblet. Then everything gets the finish. When done properly, it is very difficult to see the break line because it follows the grain.
<img src="http://www.enter.net/~ultradad/boxeldergoblet.jpg">
Here is one I did out of box elder. The finish I use for these is Bartley's Gel Varnish, since it dries to the touch fairly quickly, and reduces the chance of pieces sticking to one another.
<img src="http://www.enter.net/~ultradad/cherryrings01.jpg">
This is a closeup of some cherry rings before they were sanded and finished.
<img src="http://www.enter.net/~ultradad/weddinggoblet01.jpg">
This is the first one I posted on the internet, way back in the old days of Badger Pond. This one is curly maple, and I did it before I forked out for a ring tool.
Good luck with it, and if you have any more questions, I will be glad to try and answer them.
Bill