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Post by modeng2000 on Feb 23, 2008 20:48:25 GMT
Bob the tube I use is silicone, I'm sorry, should have said so Mine came from a fishing tackle shop where it is sold for making rings that hold a float to the fishing line like a small rubber band. It is available in various diameters. John
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Post by modeng2000 on Sept 28, 2008 9:53:30 GMT
I thought it was about time that I posted a picture of the progress so far with my DeWinton style loco. The engine has been run on air and the boiler has been tested to 5 bar and is expected to work at 2 to 3 bar. The burner is a home made intended to be fired by butane. The gear ratio is from memory 4.5:1. Some of the delay has been due to changing the original design from a free standing engine to one mounted on the side of the boiler. This I believe will help reduce the condensation problems caused while the cylinders warm up. John
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paul
Member
Posts: 8
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Post by paul on Sept 28, 2008 20:37:47 GMT
John, I can hardly believe it's six months since you last posted on this thread! Your loco is looking great, now the questions(!)... Is the modified (boiler-mounted) engine design 'home brew' or from a published plan? What's the blanked-off bush at the bottom of the boiler for? I take it you cut the gears yourself after your comment on my gear-cutting thread? Why the 'shim' under the boiler mounting brackets and are the brackets riveted through the 'firebox'? Seems to me as though the basics aren't far off complete, I guess most of the superstructure is for show. Nice to see your progress, keep it coming!
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Post by modeng2000 on Sept 28, 2008 21:51:16 GMT
Hi Paul, 1,I heard about mounting the engine on the boiler from DeWinton Dave in one of his postings. 2,The bush is for a possible boiler blow-down valve. 3,Yes, the gears are home made. 4,The shim is there because I have used Clinch nuts for the mounting of both the burner and boiler. However I forgot that the Clinch nuts are not flush with the surface of the plate they are fitted to, hence the 'shim' to lift the boiler firebox ring. The boiler mounting brackets are screwed to the firebox ring using blind tapped holes. This way the fixing screws are not in the burner flames.
I have been trying to get to several exhibitions this year but have not been able to make it for various reasons but things are looking good for the Midlands one on the 20th October.
John
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paul
Member
Posts: 8
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Post by paul on Sept 29, 2008 12:00:25 GMT
Right. How much 'meat' is there in that firebox ring John if the holes are blind?
(Must admit I'd never even heard of clinch nuts so I just looked 'em up on Google. Interesting!)
The show is looking good for me too but not sure about the day yet.
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Post by modeng2000 on Sept 29, 2008 15:56:28 GMT
The cross section of the ring is 6X6mm and the thread is M2.5 by 6 mm deep.
John
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Post by mackintosh on Oct 1, 2008 14:20:17 GMT
John The De Winton esk Loco is really looking the part. I look forward to the results of the boiler mounted cylinders. Bob
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Post by modeng2000 on Oct 1, 2008 20:47:38 GMT
Thanks bob. I expect to get to the Midlands exhibition this month and hope to pick up a thing or two to help me get on with the loco.
John
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