Instructables

how can I make a ring sizing mandrel?

I'm a cheap kind of person as in I don't want to have to pay someone to resize a few rings for me..does anyone know how to make a ring mandrel out of clay or something cheap?

theRIAA5 years ago
if it was made out of clay it would scratch the rings and/or break. what do you mean by "resize" the rings? like a 1/4 or a 1/2 step up MIGHT be possible by pounding it on a metal mandrel, but it could ruin the ring. a ring "expander" goes inside the ring and you pound it down and the ring expands. You can go like 1 to 2 sizes up with this, but it can also ruin the ring and might leave huge marks on the inside. do you just want them rounded? use a rawhide mallet to flatten the flat part, and a small strong pipe that fits inside to roll it a little rounder. a "professional" resizing involves cutting the ring, adding/removing material, then soldering a perfect, invisible seam, and then cleaning and polishing the ring of all the burnt stuff and excess solder. THEN using a ring mandrel briefly to round up the ring if they screwed up...
jtobako theRIAA5 years ago
Depending on the ring, you can go as far as a full size by hammering on a steel mandrel. The ring expanders do the same thing, but can't be used on a ring with stones without risking loosening (and loosing) the stones. A rubber mallet works better than the rawhide-it leaves less texture on the ring. Um, a ring mandrel is going to be needed after a sizing to correct the roundness of the ring no mater what-you have changed the ring shape and need to bring it back to round.
jtobako5 years ago
I'd go hardwood, but you are still going to have problems. A ring sizing mandrel is a round ruler-it measures how big a hole is. In order to put the size marks on it, you are going to need the right size holes. Are you looking to measure size or round up the ring?