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Post by Roger on Dec 24, 2020 8:36:40 GMT
Hi Roger, is my eyes playing tricks on me? Viewing your one piece cone section at gap drawing appears irrational and can't exist in practice. To me the centre spoked part is an isometric view that is at 90 deg to the axis of the remainder of the item. Brian Hi Brian, Yes, it's an optical illusion, it certainly can look like you describe unless you look at it the right way.
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timb
Statesman
Posts: 512
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Post by timb on Dec 24, 2020 10:29:00 GMT
Hi Roger, is my eyes playing tricks on me? Viewing your one piece cone section at gap drawing appears irrational and can't exist in practice. To me the centre spoked part is an isometric view that is at 90 deg to the axis of the remainder of the item. Brian Yes, did me for a while until you realise the 'spokes' are grooves and the centre boss is a hole, then it makes sense.
Great work again Roger!
Tim
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Post by Roger on Dec 24, 2020 22:34:33 GMT
No workshop time today I'm afraid, I've had far too many pre-Christmas chores to do.
However, I would like to wish everyone a Happy Christmas, stay safe and make the most of whatever you have. Things aren't good, but they could be a hell of a lot worse! I shall be cooking the traditional Christmas feast with all the trimmings, something I really enjoy doing. After that, it's into Tier 4 and hibernation!
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Post by andyhigham on Dec 24, 2020 22:59:42 GMT
The 4pm to 5pm christmas eve men's xmas shopping time?
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Post by simplyloco on Dec 25, 2020 8:59:14 GMT
The 4pm to 5pm christmas eve men's xmas shopping time? Which one are you?
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Post by Roger on Dec 25, 2020 12:47:45 GMT
My Wife decided that we should do a family 'Secret Santa' for the first time this year, so I did all mine online a few weeks ago. No visits to the shop for me, and far less presents to buy. That's my kind of Christmas! There's normally far too much waste and buying of things for the sake of it, so this is a welcome change. Long may it continue! I've also not sent a single Christmas Card this year. I honestly don't think people care if they get a card or not, and writing them is a real chore. These days we're in touch so easily by email or instant messaging, and you can say so much more with much less effort. I Maybe the Christmas Card has had its day?
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Post by chester on Dec 25, 2020 19:08:20 GMT
Roger a home made card means a lot more than a email i have friends in Holland and have NEVER received a shop bought card they buy the components or some are scratch built from drawings or paintings and take a lot of time to do there is more time, effort and thought in that than a quick email or shop bought card.
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Post by andyhigham on Dec 25, 2020 19:23:28 GMT
For the past few years I haven't been giving presents. Instead I have spent the money making donations to various charities
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Post by Roger on Dec 25, 2020 19:39:25 GMT
Roger a home made card means a lot more than a email i have friends in Holland and have NEVER received a shop bought card they buy the components or some are scratch built from drawings or paintings and take a lot of time to do there is more time, effort and thought in that than a quick email or shop bought card. I'm not knocking other people who get somthing from sending or receiving cards. Personally, if it comes in the post, I'd rather have a Round Robin rather than a few words, even though it's not personalised. These days, most of us are in regular contact with the people we hold dear through Facebook and such like. Our family has face to face time by video with those closest to us. We know what's going on in their lives and we touch base that way. Before any of this technology, it made sense to reach out to remind people we're thinking about them and maybe pass on a bit of news. Personally, I think this seems less and less important since we're in touch anyway. I very much doubt if this tradition will survive for much longer. Young people don't seem inclined to send each other cards any more, and they are the future.
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dscott
Elder Statesman
Posts: 2,440
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Post by dscott on Dec 26, 2020 0:42:22 GMT
7 out to relatives and 3 back. 6 out to others in the road and 1 very early one back. We have a new family at 21 so I don't mind that one.
Missed the scattering of small hand given ones from the Club this year.
Yes keeping in contact via Computer has changed the card thing. A cept down in Tamar Vaaalley where my Uncle knows everyone. Washing lines of them strung round the house. Just missed his 80th. 2055 the last card gets sent in Cornwall!!
David and Lily.
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Post by delaplume on Dec 26, 2020 14:07:53 GMT
No cards posted all ?.. think of all that fossil fuel not burnt as a result ( directly or indirectly ) .......Oh dear Roger, it would sound like we are heading for Huxley's Brave New World after all...alas.
Is it my imagination or are the children of to-day growing bigger "gaming" thumbs ??...........Spooky Darwinian happening ??
Just look at the instruction labels on many of to-day's products where it says}-------- "Keep clear of Children"....do they know something we don't ??...LoL !!
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Post by Roger on Dec 26, 2020 18:40:54 GMT
No cards posted all ?.. think of all that fossil fuel not burnt as a result ( directly or indirectly ) .......Oh dear Roger, it would sound like we are heading for Huxley's Brave New World after all...alas. Is it my imagination or are the children of to-day growing bigger "gaming" thumbs ??...........Spooky Darwinian happening ?? Just look at the instruction labels on many of to-day's products where it says}-------- "Keep clear of Children"....do they know something we don't ??...LoL !! Hi Alan, Nope, not one card sent. However I've emailed and had face time on our large living room screen with family, so we've stayed in touch.
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,956
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Post by JonL on Dec 26, 2020 21:40:32 GMT
I did wonder how much viral transmission happens on cards, but only because I'm very ignorant of biology. It's probably nil risk.
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Post by Roger on Dec 26, 2020 21:45:02 GMT
I finished the cones and spacers today, so did a quick test to see what happens.
Basically, the O-ring valve I've introduced causes too much back pressure, even if I use a 4mm O-ring on the 3.5mm diameter, so this isn't going to work as it is. I'll give that some more thought.
Trying it without the O-ring with a 0.3mm regulation gap is only giving me 50psi on the outlet with 90psi of steam, so that's not enough. It's not surprising though, the overflow is pouring way too much water, so it looks like the regulation gap is too big. I need to make sure the cones are being properly pushed together though, it's possible the Steam Cone isn't being presented at the right distance from the Condensing Cone.
Anyway, that's enough for today, I'll take a closer look tomorrow when I've got more time. I have a feeling the the regulation gap needs to be pretty close before it will work properly. I haven't received the water valve parts yet, so I'm just pinching the hose to see if that has any effect. It doesn't appear to. If the regulation gap is miles out, I don't think it's going to work anyway.
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Post by delaplume on Dec 26, 2020 22:56:17 GMT
Hi Roger,
Now that you have all the programming data in store how about making a test injector body out of a clear, hard plastic so you can see what's happening ??
One picture-------- 1,000 words etc ..
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Post by Roger on Dec 26, 2020 23:35:53 GMT
Hi Roger, Now that you have all the programming data in store how about making a test injector body out of a clear, hard plastic so you can see what's happening ?? One picture-------- 1,000 words etc .. Hi Alan, It's certainly possible, and I have considered doing that. We'll see how much I can deduce from the setup I've got. Ideally I just want to get these ones working and move on. However, I somehow think this is going to turn into a major investigation, so it's possible I might end up doing what you suggest.
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Post by delaplume on Dec 26, 2020 23:47:54 GMT
We're all behind you Roger.....( make of that what you will-----LoL !!)
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Post by Roger on Dec 27, 2020 12:58:49 GMT
I can see that the O-rings are suffering from getting shaved on the sharp corners where the internal holes for the water inlet and the overflow meet the bore. I need to take the sharp edge off these, but it's really difficult to get in there. I've just bonded this 5mm Silicon Nitride ball to a 4mm piece of Brass which I hope to use with some fine grinding paste to work on the sharp edges from either end. I don't think it will take much because there's only 0.1mm compression on the O-ring. 20201227_124849 by Roger Froud, on Flickr Another possibilty is to use some of these replacement soft plastic Barbell ball end to hold some grinding paste which will adhere to the surface better. However, I can use a thin smear of Silicone rubber sealant on the Carbide ball to achieve a similar effect. I'm hoping that the grease in the grinding paste will keep presenting it to the corner as I turn it. I might use the Dremel with this in it, but that might not go slow enough for my liking.
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Post by chris vine on Dec 27, 2020 17:22:53 GMT
Hi Roger,
On your regulation gap: You seem to be thinking it is too large as you are getting a lot of overflow. I think your reasoning is that too much feed is getting into the injector so that it isn't able to be given enough momentum by the steam flow to create enough pressure in the delivery cone.
I have an injector on my small tank loco, 7.25" gauge Bridget, which is the most perfect injector I have ever owned. Sadly I didn't make it!! The reason for telling you this is that it has a huge range up to 120 psi and down to something so low that the pressure gauge doesn't really show any reading at all. It must be around 10 or 20 psi I think. However, and this is my point, at the very low pressures I have to adjust the water valve so that it is only just cracked open and then it feeds beautifully - you can feel the inlet clack is hot to the touch rather than burning when it isn't feeding. So a good degree of regulation is possible with the feed valve - I don't think this is a bad price to pay for an extended range.
If I turn off the steam when it has been running at this low pressure, the water only drips through very slowly, which gives a sort of understanding of how little water is being allowed through the injector at the lower pressures. Equally, it does fill up the boiler at a realistic rate!!
Hope this helps, Chris.
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Post by Roger on Dec 27, 2020 19:02:12 GMT
Hi Roger, On your regulation gap: You seem to be thinking it is too large as you are getting a lot of overflow. I think your reasoning is that too much feed is getting into the injector so that it isn't able to be given enough momentum by the steam flow to create enough pressure in the delivery cone. I have an injector on my small tank loco, 7.25" gauge Bridget, which is the most perfect injector I have ever owned. Sadly I didn't make it!! The reason for telling you this is that it has a huge range up to 120 psi and down to something so low that the pressure gauge doesn't really show any reading at all. It must be around 10 or 20 psi I think. However, and this is my point, at the very low pressures I have to adjust the water valve so that it is only just cracked open and then it feeds beautifully - you can feel the inlet clack is hot to the touch rather than burning when it isn't feeding. So a good degree of regulation is possible with the feed valve - I don't think this is a bad price to pay for an extended range. If I turn off the steam when it has been running at this low pressure, the water only drips through very slowly, which gives a sort of understanding of how little water is being allowed through the injector at the lower pressures. Equally, it does fill up the boiler at a realistic rate!! Hope this helps, Chris. Hi Chris, That's useful to know. At the moment it doesn't feed at all at any pressure, I can see the pressure is sitting at about 20psi below what it needs to be to enter the boiler. At the moment I'm just trying to home in on anything that will work with the current arrangement and then go from there. I have a feeling I'm going to have to introduce a valve for the gap in the Combining Cone, but I don't want to go down that road until I've learned a bit more. It's a slow process, adjusting the gap little by little, but I don't want to overshoot going in too big steps. I'm reducing the gap by 50microns each time.
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