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Post by simplyloco on Jan 15, 2021 20:23:27 GMT
Valve Actuating Arms.More of the same, another complete fabrication! Drilling a hole the same size as the actuator arms so that I can split them. Two little darlings waiting to be turned into shapely young things! Buttons to the rescue! Cupalloy solder paste job. The finished article. I'll do the other one tomorrow, and then I can get on with the more complicated top shaft, and then it's the bearing brackets!!!.
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Post by keith1500 on Jan 15, 2021 22:54:14 GMT
Very nicely done. Great series of photos.
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Post by terrier060 on Jan 17, 2021 11:43:23 GMT
Hi Ed, your spherical objects received today! My grateful thanks. John Thanks John. I am going to try and finish the parts for my governor on the Tormach. They are quite complicated pieces which is why I gave up and have not finished the engine. You have inspired me to continue, but I had better try and get one of these injectors made first. Great job you have made on the rocking lever. I made all my steel parts in free-cutting stainless, which I am glad of, as unfortunately my workshop is directly under the bathroom and I have had two accidents where it got flooded and everything in mild steel rusted. Luckily it did not do the same to the cast-iron.# Yours is going to look lovely when it is finished. Have you a boiler to run it on? Ed
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Post by simplyloco on Jan 17, 2021 12:18:50 GMT
Yours is going to look lovely when it is finished. Have you a boiler to run it on? Ed Hi Ed. I have this one, but I'm thinking along the lines of an inboard electric motor with variable speed and a timer. I have an old Singer motor with a worm gear on it which will do very nicely. Alternatively I could do a diorama with this boiler in it but where would I put it as it would be huge??? John John
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Post by ettingtonliam on Jan 17, 2021 13:07:44 GMT
No, no. Not a vertical boiler! It has to be a Lancashire twin flue boiler! Now that would be big.
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Post by terrier060 on Jan 17, 2021 13:08:54 GMT
That is a lovely boiler John. I suspect it would be more than enough to run the beam engine as it only needs a few pounds on compressed air to make it run slowly. I can't remember whether the design came with piston rings? If not I will have done the same as on all my locos (including the Terriers) and used one simple 'O' ring. I have never had any trouble using 'O' rings and it negates all the extra work that machining proper rings causes. The tank engine has gone hundreds of miles on them and they have worn flat but still seem to seal without any blow-by. At first I used graphite packing, but this just blocked the drain cocks, as I had very small scale pipes on them.
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Post by terrier060 on Jan 17, 2021 13:15:39 GMT
No, no. Not a vertical boiler! It has to be a Lancashire twin flue boiler! Now that would be big. I think there is something similar in K N Harris' book 'Model Boilers and Boilermaking'. A lot of stoking to do!
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Post by simplyloco on Jan 17, 2021 13:19:15 GMT
That is a lovely boiler John. I suspect it would be more than enough to run the beam engine as it only needs a few pounds on compressed air to make it run slowly. I can't remember whether the design came with piston rings? If not I will have done the same as on all my locos (including the Terriers) and used one simple 'O' ring. I have never had any trouble using 'O' rings and it negates all the extra work that machining proper rings causes. The tank engine has gone hundreds of miles on them and they have worn flat but still seem to seal without any blow-by. At first I used graphite packing, but this just blocked the drain cocks, as I had very small scale pipes on them. The design specifies two cast iron piston rings, which I don't have. Easy enough to make at this scale or I can use O rings as you suggest or filled PTFE. I'm wary of running it even once on steam: all those cast iron bits to go rusty when placed on the mantlepiece...! John
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Post by terrier060 on Jan 17, 2021 14:08:01 GMT
Ah! PTFE. Yes I must get up-to-date with these new materials. I notice that many of the great modellers on this site of ours use modern materials, some of which I have never heard of! I honestly can't remember what I used, but I suspect 'O' rings. In fact I probably only used one, as two are unnecessary as there is no gap unlike rings.
You are probably right about running it on steam, though there is plenty of water in compressed air, and I always give a good squirt of oil in the feed before I run it and have never seen any brown muck coming out. I suspect the oil gets impregnated into the cast-iron. There is a gentle puff as it exhausts which is nice to hear.
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Post by chris vine on Jan 17, 2021 14:37:57 GMT
Hi John,
I don't think you need to deprive yourself of the pleasure of seeing your model come to life on steam. As long as you have a good oil supply, either during, or maybe afterwards, the iron will soak it up and won't corrode.
Also, if it is on a shelf to be admired, you will be sure to give it a spin to show visitors (when we are allowed them again)!!
Chris.
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Post by coniston on Jan 17, 2021 18:22:51 GMT
Why can't I see your photos John? I could before but not for the last couple of days.
Chris D
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Post by simplyloco on Jan 17, 2021 19:03:31 GMT
Why can't I see your photos John? I could before but not for the last couple of days. Chris D HiChris. Nothing has changed this end. All on Imgur. John
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Post by dsa on Jan 17, 2021 19:21:17 GMT
No, no. Not a vertical boiler! It has to be a Lancashire twin flue boiler! Now that would be big. A Cornish boiler please, in keeping with the locations of these beam engines.
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,907
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Post by JonL on Jan 17, 2021 20:32:02 GMT
I can't see them either
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Post by dsa on Jan 17, 2021 21:02:28 GMT
Photos showing fine on chrome
David
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Post by coniston on Jan 17, 2021 21:09:44 GMT
Had to change my DNS provider, don't know why, no other changes in my computer for several years but this week couldn't see any pictures from imgur, which is what I use as well for photo sharing. Anyway seems ok now.
Chris D
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Post by ettingtonliam on Jan 17, 2021 21:49:47 GMT
No, no. Not a vertical boiler! It has to be a Lancashire twin flue boiler! Now that would be big. A Cornish boiler please, in keeping with the locations of these beam engines. Not necessarily. 'Column' beam engines could be found anywhere, not primaarily in Cornwall. Even the big Cornish engines were ofton providd with a bank of Lancashire boilers.
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Post by dsa on Jan 17, 2021 22:04:19 GMT
Initially in Cornwall,and then they became widespread,agreed. My ancestors made and built them at Harvey's in Hayle. Many of the cornish engines were exported to Australia when the mines closed. I think if you could expand on this -- Even the big Cornish engines were ofton providd with a bank of Lancashire boilers --it would be of interest,especially some pics or links by PM please. Thanks David
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Post by terrier060 on Jan 18, 2021 0:26:38 GMT
Harris does have plans for a Cornish boiler in his book! Maybe I should make one. I could use it to test injectors!
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Post by simplyloco on Jan 18, 2021 20:45:02 GMT
Valve Motion Links (2)
Yet another fabrication job. There are 1/2" dia. bosses each end. The idea is to support the bosses on pins and silver solder them onto the shafts. Two 1/4" dia. MS pieces were cut to four inches long and drilled 2mm x 5mm deep each end. The compound slide was set to 1.25 degrees (as near as dammit) and the button tool used to remove material. I left a flare at one end. After turning both ends I held the shaft in a smaller collet and filed and sanded the fish belly profile. Here' s the components ready to be silver soldered. Using a small half round file I files the ends to fit snugly on the boss. Silver soldered using the CupAlloy paste. It's all coming along very nicely. Jim sent me some very useful info today. Thanks Jim!
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