On Fri, Mar 27, 2020 at 03:24 AM, Tamra wrote:
oh, rolled threads!?
In the bottling industry they use ROPP caps - the metal screw tops you find on things like whiskey bottles, ROPP stands for Roll On Pilfer Proof. Basically a plain cap is slipped over the neck of the bottle and then a roller head revolves around it swaging the thin metal to the thread form of the glass bottle. The roller continues down and swages in the end of the cap, which is what gives you the little ring of metal that remains after you open the bottle. If you watch carefully, towards the end of this video, you can see it happening:
In the same way you can roll threads onto a thinnish wall tube by placing it over a steel master and running a roller down it, Should be easy once you've made the master!
