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#11
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Stainless Steel Ring Material
On Sun, 24 Sep 2006 21:00:54 -0700, in rec.crafts.jewelry Abrasha
wrote: And how would you propose holding a hex nut (assuming he finds one with the right dimensions to machine his ring) in a lathe? Furthermore, where would he go to buy just one hex nut with the right dimensions, that would cost him less, than say 6" of 303 stainless rod? BTW, a size 11 requires an inside diameter of approximately 20.6 mm (.81") Let me know when you find the nut, will ya. Actually, I did just that a few years ago. A local non-chain hardware store stocked a surprisingly wide range of stainless marine grade hardware, including 3/4 and 7/8ths hex nuts and bolts. I used one of the bolts, with the head cut off, and chucked into my lathe chuck so the nut screwed onto the short extending bolt end and jammed tight to the chuck jaws, to face off the ends, and turn the outside. Then the inside was bored out with the outside of the ring held in a four jaw chuck with the jaws reversed. This worked well mostly because the final finish of the ring was not to be a machined finish, but traditionally hand polished, so the slight marking on the outside left by the chuck jaws was no problem. The main problem was that it was all done on a silly little Unimat lathe. Way too underpowered, so it took much longer than it should have, especially the bumpy part of cutting off the hex edges.. But it did work well enough. About the trickiest part was getting the band mounted really true in the four jaw chuck to bore the inside... That store is gone now, however, so I'm not sure how easy it would now be for me to find another of those large hex nuts if I needed. That time was much too easy. The place was five blocks from my house. Peter |
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#12
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Stainless Steel Ring Material
Peter W.. Rowe, wrote:
On Sun, 24 Sep 2006 21:00:54 -0700, in rec.crafts.jewelry Abrasha wrote: And how would you propose holding a hex nut (assuming he finds one with the right dimensions to machine his ring) in a lathe? Furthermore, where would he go to buy just one hex nut with the right dimensions, that would cost him less, than say 6" of 303 stainless rod? BTW, a size 11 requires an inside diameter of approximately 20.6 mm (.81") Let me know when you find the nut, will ya. Actually, I did just that a few years ago. A local non-chain hardware store stocked a surprisingly wide range of stainless marine grade hardware, including 3/4 and 7/8ths hex nuts and bolts. I used one of the bolts, with the head cut off, and chucked into my lathe chuck so the nut screwed onto the short extending bolt end and jammed tight to the chuck jaws, to face off the ends, and turn the outside. Then the inside was bored out with the outside of the ring held in a four jaw chuck with the jaws reversed. This worked well mostly because the final finish of the ring was not to be a machined finish, but traditionally hand polished, so the slight marking on the outside left by the chuck jaws was no problem. The main problem was that it was all done on a silly little Unimat lathe. Way too underpowered, so it took much longer than it should have, especially the bumpy part of cutting off the hex edges.. But it did work well enough. About the trickiest part was getting the band mounted really true in the four jaw chuck to bore the inside... That store is gone now, however, so I'm not sure how easy it would now be for me to find another of those large hex nuts if I needed. That time was much too easy. The place was five blocks from my house. Peter Yeah, I've seen machinists rig ways to mount, index and cut lots of very odd stuff - even on 'limited' lathes. But I still wonder if Abrasha's complaint about the cost might be valid. How much did that size stainless nut cost? Carl -- to reply, change ( .not) to ( .net) |
#13
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Stainless Steel Ring Material
On Mon, 25 Sep 2006 08:06:49 -0700, in rec.crafts.jewelry Carl 1 Lucky Texan
wrote: Yeah, I've seen machinists rig ways to mount, index and cut lots of very odd stuff - even on 'limited' lathes. But I still wonder if Abrasha's complaint about the cost might be valid. How much did that size stainless nut cost? Abrasha's point about cost is certainly valid. The nut, and bolt I used to mount it, probably cost me five to eight bucks, if I recall. A costly alternative to buying proper stock. But the Unimat lathe probably couldn't have mounted a larger bar anyway, at least not easily, and for a quick solution to a one-shot "rush job" problem, the cost was a trivial concern, and likely more than offset in time savings for me. But that's only the case because the store was just right there, and I'd already known they carried the stuff. Peter |
#14
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Stainless Steel Ring Material
Carl 1 Lucky Texan wrote:
Peter Yeah, I've seen machinists rig ways to mount, index and cut lots of very odd stuff - even on 'limited' lathes. But I still wonder if Abrasha's complaint about the cost might be valid. How much did that size stainless nut cost? Carl I would think, that if you're lucky enough to find one locally at a hardware store (unlikely in that size), it won't cost much. Locally, I can go to Harrison and Bonini. They specialize in fasteners. Minimum over the counter sale $15.00. If you buy one from MSC, you'll pay a minimum shipping charge of around $7.50 And I don't know if you can even buy just one from them, or if they are sold in minimum quantities of 100. It would not be any different with McMaster-Carr. -- Abrasha http://www.abrasha.com |
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