I'm still firm in my belief that the whole eternity ring is a fool's
errand. That said, I feel the need to interject one little
Since such rings cannot be sized, the process of
CAD/CAM/casting/fixing or assembling has to be repeated every
The question arises how long such process takes and how much it
costs. Even a rank beginner can fabricate this ring in a week,
after he/she understands my method. It means that the ring can be
commercially produced by hand-fabrication for about $600 in
labour, using less than 10grams of gold. The question is can
"wonder technologies" match it. We know it took an hour to make CAD
What I want to know is how much and how long for other phases of
the process. And that assuming that fixing part could produce nice
appearance without any rework, which I doubt greatly.
Not exactly. There are iterative CAD systems that will allow you to
set up a set of parameters such that you just feed in a size for the
part ID (and possibly number of stones, and diameter), and it
recalculates all the other elements on the fly from there. Not just
scaling everything X percent, it actually scales various parts
differently, based on logical/relational relationships defined
Amazing PITA to set up the first time, but plug-n-play from there.
Other than knowing that these systems exist, I don't know much about
them. Never used them directly.
I have done something similar in my other life as a graphic
designer. For a while I specialized in variable data printing, which
was similar, in that you had to design the layout to accommodate
wide ranges of text and image size, as well as different images
being present (or not). These sort of things are used for catalogs,
and real-estate flyers. Ever notice that the real estate flyers
always show a house near yours? It's picked out and printed on the
fly, based on your address. Same thing with most catalogs these
days: they know you're a 40 year old male jogger, so they're not
going to waste paper showing you pink snowboards or whatever. The
company has a database of customer data, and the printing computers
change the layout and contents on the fly, based on logical rules
working across the data.
Massive pain to set up, and check against outlier conditions the
first time around, but stupidly simple after that.
I imagine the iterative CAD systems are similarly front loaded. Not
worth the time for *one* eternity ring, (or even 20). Once you get
into hundreds, suddenly it makes much more sense.