Ring blanks and inside diameter
Let's say I have a strip of metal that is 1mm thick and precisely 1" long. If I form that into a circle, which circumference is precisely 1" - the outside, the inside, or the mid-point between the two? In other terms, does the outside surface "stretch" or does the inside surface "compress" when forming the circle?
The solution to that question is in the book PROFESSIONAL
GOLDSMITHING by Alan Revere . ISBN 0-442-23898-3 TO ORDER - call -
On pages 208 - 209 in the appendices there is a very comprehensive
table which shows the relationship between the ring size needed and
the flat length of the ring stock as determined by the thickness of
the ring stock. The appendices alone are worth the price of the
The outside stretches and the inside compresses so the thicker the
ring stock, the longer the flat length the ring stock needs to be
The Book is well written, well illustrated, and well bound . It is a
very good value . I most highly recommend it. A standard disclaimer.