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Post by gardener69 on Sept 13, 2014 11:41:14 GMT
Anyone know where I can buy Clupet piston rings from. Have tried one supplier but he seems to have gone out of business
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Post by Roger on Sept 13, 2014 12:17:47 GMT
Does anyone know how these are made? Even with the finest of slitting saws the insides aren't going to lay flush to each other once they've been split unless the bridge is slightly given a 'set' to bring the faces together. Is that how that's done? It might be possible to almost avoid that issue if they were slit with a wire eroder.
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jasonb
Elder Statesman
Posts: 1,207
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Post by jasonb on Sept 13, 2014 12:39:37 GMT
Have you tried Alan who actually makes them
clupets@btinternet.com
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uuu
Elder Statesman
your message here...
Posts: 2,800
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Post by uuu on Sept 13, 2014 12:53:15 GMT
I've been wondering along the same lines myself. Try livesteammodels.co.uk Page 46 of their catalogue lists them - but not in that size. Perhaps they may be able to get them in your size. Or Station Road Steam use them in their Stafford loco - they may have a supplier who can help. Let us know the results, please, if you follow either of the leads up. Wilf
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uuu
Elder Statesman
your message here...
Posts: 2,800
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Post by uuu on Sept 13, 2014 12:55:35 GMT
And try this for a description of manufacture, which I'm not sure I understand: Clupet ringsWilf
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Post by marshall5 on Sept 13, 2014 15:48:14 GMT
Clupet rings are only made by one person (Allan Smith in Millom?) and I heard, some months ago, that he hadn't been well. My experience has been that if they are in stock you're O.K. but if the ones you want are a special size you can be a long time waiting. As mentioned in a previous thread I waited 9 months for a set, gave up, and went back to plain rings which are working fine. Also,if you go back over previous threads you will find that some people swear by them, others see no advantage. Down to personal choice in the end I suppose. Hope this helps. Ray.
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Post by Roger on Sept 13, 2014 20:26:52 GMT
And try this for a description of manufacture, which I'm not sure I understand: Clupet ringsWilf Hi Wilf, I also found that link but couldn't really decipher what they meant. From looking at some of the pictures I've seen, it looks like the split halves touch each other all the way round but it's hard to see how that's possible. I can see how the parts can be clamped together and the bridge part ground to the same width of the two touching halves, you would need to remove the width of the slit from that point, probably half from each side? After that process, the two halves are surely going to still stand apart. Maybe that's how they are and it's not important because they're put into a groove. It seems to me like there's a business opportunity here for someone who wants to make a little machine.
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Post by Deleted on Sept 13, 2014 20:39:23 GMT
A chap at the club, Dave Waldram who built the V2 pictured in my Michael Breeze weekend post, visited the factory where they are made some years ago. He told me that the rings are somehow turned inside out after machining but that seems hard to believe. He insists that is correct though as he saw them being made.
John
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Post by Roger on Sept 13, 2014 21:17:32 GMT
Hi John, That's not as mad as it seems. If you picture the problem of the faces standing apart by the thickness of whatever slit them, the only way to make them want to press their faces together is to have them bent at the bridge. If you do as your friend suggests, and force the open ends over the face they're supposed to mate with, then they can be made to take on a 'set' in that direction. Obviously that requires them to bend slightly and if they're Cast Iron there's a chance they will snap, but I bet that's how they're done. I've just had a quick look and found these slitting saws that are only 4 thou thick, so you wouldn't need much set to close the halves onto each other. All of a sudden, something that looks almost impossible to make looks possible with a little thought and some tooling to hold the parts while they're slit and again to size the width.
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Post by Deleted on Sept 14, 2014 1:36:20 GMT
Hi John Has Dave Waldren got Clupet rings fitted to the V2??
Ben
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Post by Deleted on Sept 14, 2014 1:56:08 GMT
Yes
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Post by Deleted on Sept 14, 2014 2:49:30 GMT
Excellent, cheers John! At least I now know they are available! Any idea what he has fitted to the valves?
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Post by ejparrott on Sept 14, 2014 8:29:47 GMT
As said, only one supplier. He's still in business, he supplies the Talyllyn with Rings for air pumps.
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Post by Deleted on Sept 14, 2014 8:55:36 GMT
Hi Ben,
No, I don't know how he did the valves. I'll try and remember to ask him when he gets back from holiday.
John
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nonort
Part of the e-furniture
If all the worlds a Stage someone's nicked the Horses
Posts: 277
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Post by nonort on Sept 18, 2014 7:57:48 GMT
At this diameter I presume they are for the cylinders. Why not use two opposed rings pegged in place as in a two-stroke engine. With a little research proprietary rings must be available. Plus check to see if a metric size could be used and the bore size modified to suit. Thinking back 'CORD' rings were similar to 'Clupet' rings I think. CORD rings were developed to save re-boring an engine. They did leave the engine completely kna***** and needing relining,on much the same level as sawdust in the gearbox tricks of old.
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Post by gardener69 on Sept 18, 2014 14:28:59 GMT
Many thanks to the replies, I have passed on the info to a friend who is chasing it up. Will let you know the result.
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