Hi,

I wanted to make a worry ring, using 22 ga sheet for the base. I

knew that the final size was to be an eight, and since I was going to

plannish (? hammer the heck out of it) it, decided to start with a

size 7 1/4.My math is just plain wrong, and I need help please, as I

ended up starting with a size 6 and a half.Here’s what I did:The ring

blank was 9mm wide, and since I wanted a starting size of 7 1/4, I

took 54.7 mm and added 2(.73) for two times 22 ga thickness (this is

obviously where my math is wrong - ha! ), and got 56.16mm. I decided

to be a bit generous and round up to 58 mm, to allow for filing of

terribly crooked ends. Soldered the ring such and promptly ended up

with a 6.5… Can someone help me with the correct formula? Or

point me to a resource? I have a book with a table, but doesn’t go as

thin as 22 ga, so I still need to know how to calculate correctly.

Thanks soooooo much!

Ros