I am looking to make an anticlastic bangle bracelet for myself and
I am wondering how much extra length should I add to it so it will
fit over my hand. I know that the inner diameter shrinks after
forming I measured my hand at the widest and it is about 8.25"
The timing of your question is interesting—my co-author (Betty
Helen Longhi) and I are nearing the finish-line on our book about
synclastic and anticlastic forming (shell forming). We were talking
about this the other day, for the section on pattern-making. Here is
a way to get a rough idea: Draw the silhouette/side view of the
bracelet, full size. Then, draw a line that is half-way between the
inner circumference and the outer circumference. Measure this line by
"walking" with a pair of dividers, or use a bendable ruler, or a
strip of paper. This measurement is a good starting place.
Remember, too, that it is easier to take a piece of metal out, and
re-solder, than to stretch the bracelet if it is too small.
Here is a trick that I learned from Ronda Coryell for making a
bangle bracelet smaller: bend it so that it is not in one plane.
(Hmmm. That may take a photo or sketch—let me (or Ronda?!) know if
you need that better explained.
I hope this is understandable, and helpful!