On Monday 18 November 2019 05:42:24 andy pugh wrote: > On Mon, 18 Nov 2019 at 03:52, Gene Heskett <[email protected]> wrote: > > I suggested that the jewelers usually have an expandable tapered > > arbor, and a collet of sorts that can adjust a ring, cold, by about > > a size, more if heated. > > https://www.cooksongold.com/blog/equipment-technique-focus/how-to-resi >ze-a-ring > > > But what about my ER42 kit? It ought to be able to do this > > compression to restore a decent fit, or would I wreck the ER42's > > ball bearing nut trying to put that much squeeze on the ring? > > I think it would work, but might alter the profile. The collet has a large number of "leaves" which might be imprinted, but looseing the nut and rotating the ring to a new position a couple y\times should reduce that to the vanishing point I'd think. After 30 years its still round so I assume its well work hardened and it would be advised to anneal it according to the link above, but I've no idea if if enough like brass to use the same sequence of heat to a color state and quench in cold water, which I do all the time to my rifle brass as I reload it. The neck of the case must be reduced in diameter by a few thou and that work hardens the brass eventually causeing a cracked neck making it useless, so we set them base down in a skillet, heat the neck until a color change is seen moving down the shoulder taper, at which point that one is knocked over into the water. If done every 3 or so reloads, they can be reloaded many times. I've worn out Ackley-06 rifle barrels useing 40 selected cases and had 36 usable's left when that barrel threw its first keyhole. Around 4000 rounds, which put 3 ton or so of venison in the freezer over close to 20 years. A Bastard but sweet barrel, 3/4" 10 shot groups if I did my part on the bench. Apparently started as a P14 barrel, meaning it needed .3115 bullets.
Some one back in the 60's had run a 30-06 reamer into it and sold to the milsurp peddlars. I'd run the Ackley-06 reamer into it, and was getting 2" groups. We slugged it to find it wasn't a .3085 but a .3115. I trimmed the necks about 3 thou on those 40 cases and put 303 bullets in it, instant fly on target killer. Even made a 6 pack of suds once walking out to prove the bullet hole was bloody. The Douglas I replaced it with is also gone now, rust pits from hunting in the rain here in WV but never reliably got down to 2" groups. The SS 6.5 Creedmore I screwed into it 2 years ago has less than 100 rounds on it so far, and has already done two groups under an inch. I have faith it will do 1/2" groups if I can find the right load. My biggest problem at the range today is the walk out and back to put up or retrieve the targets. Two wore out disks in my back are pinching the sciatic nerves, making that walk VERY painfull. I haven't been easy on me getting to 85 yo. And I've now made the grim reaper blink twice. > I think a better way would be to machine the required half-profile of > the new size into a piece of bar on the lathe, then push the ring in, > flip and repeat, like the commercial ring shrinking tools. This is true, but restricts the size choices, whereas if the ER42 collet idea works I could make it fit a lead pencil if annealed enough times. I don't need to go that far though. 1/16" inch OD of shrink ought to do it. She's had a wrapper shrinker on it for 15 of those 30 years now. But it broke recently. Google found me a howto for the anneal, mix a coating of boric acid powder and alky, paint it on and dry, bring to a bright red heat and quench in water. Like brass only 600F hotter. Sounds doable with a propane torch in out of the wind. > But, then, I doubt that a jeweller would charge much for the service. > (My sister is a jeweller, I have asked here whether she would squeeze > or cut-and-shut. But as she is in the UK she is no help to you) I'll give the local jeweler a ring and see. Need 2nd cuppa first though. ;-) Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
