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Post by runner42 on Oct 29, 2018 6:03:12 GMT
Hi Lisa,
you could use brass or gunmetal, either would be OK since you would be able to silver solder the copper bends to these materials. You don't have to put the pocket for the O ring in the CI cylinder you can put it in the flange you are making which may be easier to achieve. That's OK if you are not following the design to the letter as specified.
Brian
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Post by David on Oct 29, 2018 6:30:23 GMT
The B class has exactly the same arrangement - not surprising given Barry designed it too! Here are the best two views I can find of mine. The flanges are made from 3mm brass and are square with rounded corners. This is so the rebate in the cylinder casting can be milled out. I probably did use a boring bar for the o-ring groove. There is a screw in each corner of the flange. They are meant to be bolts but I can't do bolts up in that restricted space. I'd say they're 8BA. Yours should be slightly easier to make because on the B class we have to cut the elbow right below the bend to get it through the frames, and it had to be soldered in situ. This made it a right pig of a job. You can see we also had to cut away the cylinder mounting flange. All up I was really pleased to get the exhaust manifold done, even though it ended up pulling the smokebox back about 2mm because I didn't get the angle right.   |
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Lisa
Statesman
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Post by Lisa on Oct 29, 2018 7:39:39 GMT
You don't have to put the pocket for the O ring in the CI cylinder you can put it in the flange you are making which may be easier to achieve. Thanks Brian, I'd considered that but it'd also mean have to make it considerably thicker, and it's not an issue using the boring head anyway. The B class has exactly the same arrangement - not surprising given Barry designed it too! Here are the best two views I can find of mine. The flanges are made from 3mm brass and are square with rounded corners. This is so the rebate in the cylinder casting can be milled out. I probably did use a boring bar for the o-ring groove. There is a screw in each corner of the flange. They are meant to be bolts but I can't do bolts up in that restricted space. I'd say they're 8BA. That's brilliant David, thanks! I've got a nice little set of sockets that simplify getting into tight areas like that; they're older than me though, so no idea where they came from. |
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Post by builder01 on Oct 29, 2018 21:41:35 GMT
I'm not sure why you would need an O ring. A flange, as you are thinking, a few screws, and a gasket works just fine. There are no leaks with this type of attachment and easy to do. - David  DSCN0956 - reduced 4 by Builder16, on Flickr |
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Post by David on Oct 29, 2018 21:51:28 GMT
That's some neat soldering David.
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Post by builder01 on Oct 29, 2018 22:01:50 GMT
That's some neat soldering David. Thank you! |
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Lisa
Statesman
Posts: 806
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Post by Lisa on Oct 29, 2018 22:48:33 GMT
I'm not sure why you would need an O ring. Probably not, but it doesn't hurt. That is a rather neat looking arrangement you have there though. Anyway, exhaust passage, O-ring pocket, and flange bolting holes done in one cylinder. First time I've used a boring head on this mill, which all went rather well.  Aside from the cleading and a bit of cleanup and deburring, that's this cylinder done. Well, plus the valve and piston still to do. |
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Post by David on Oct 29, 2018 23:37:19 GMT
Nice one. You’re not wasting any time here.
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Lisa
Statesman
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Post by Lisa on Oct 30, 2018 1:46:10 GMT
Nice one. You’re not wasting any time here. Thanks, I'm hoping to test her on air before the year ends, so fingers crossed. |
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Lisa
Statesman
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Post by Lisa on Oct 31, 2018 16:03:51 GMT
A bit of late night drilling and boring, and the second exhaust passage is now done.   Still the cleading to sort out, but that's not mentioned in the plans so I'll mess about with some cardboard to get the shape, and work out where I need to drill and tap to attach it. But as the cleading's not in the plans I can sort of claim that the cylinders are finished... maybe I'll call that finished part one. I'm gradually hacksawing the pistons off a big lump of stock, so after the cleading I'll probably do the valves, then the frames need to be drilled and tapped to actually bolt the cylinders in place, also gaskets need to be made. |
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rrmrd66
Part of the e-furniture
Posts: 339 
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Post by rrmrd66 on Oct 31, 2018 16:49:28 GMT
I'm not sure why you would need an O ring. A flange, as you are thinking, a few screws, and a gasket works just fine. There are no leaks with this type of attachment and easy to do. - David DSCN0956 - reduced 4 by Builder16, on Flickr Not too certain who made this "y" piece ? Lisa or David.
Anyway its very nicely done and I am just about to make something very similar for my Hunslet
The detail plan says " 15mm od 90 degree commercial bend" I don't think these are available anymore?
How did you make yours? Please explain
Thanks
Malcolm
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Post by Deleted on Oct 31, 2018 17:02:34 GMT
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rrmrd66
Part of the e-furniture
Posts: 339
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Post by rrmrd66 on Nov 1, 2018 7:41:12 GMT
Thanks for this Pete
You don't know how they achieved the "bifurcation" do you?
regards
Malcolm
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Post by Deleted on Nov 1, 2018 8:38:41 GMT
Hi Malcolm
I believe that the two ends that join are cut away and silver soldered together, looking at David's lovely piece of work, it looks like he's also made use of the collar to keep everything in place before soldering takes place. I would assume that some form of jig was also used to keep things aligned. I'm sure that when David sees your question he'll give you details as to how he did it.
Regards
Pete
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Post by Roger on Nov 1, 2018 9:01:30 GMT
I'm not sure why you would need an O ring. A flange, as you are thinking, a few screws, and a gasket works just fine. There are no leaks with this type of attachment and easy to do. - David In terms of what they achieve, I don't see the difference between using an 'O' ring or a gasket really, except you can buy 'O' rings off the shelf. |
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Post by builder01 on Nov 1, 2018 17:57:14 GMT
Hi Malcolm I believe that the two ends that join are cut away and silver soldered together, looking at David's lovely piece of work, it looks like he's also made use of the collar to keep everything in place before soldering takes place. I would assume that some form of jig was also used to keep things aligned. I'm sure that when David sees your question he'll give you details as to how he did it. Regards Pete Yes, as Pete has described, this was made from two pieces of copper pipe with the sides machined away, then brought together and fitted into the larger piece of pipe (tube). The entire assembly was brought up to temperature and silver soldered. It was pretty much self supporting before soldering, so, no jig was needed. The tubing is ordinary copper tube from the hardware store. It is thick wall copper water pipe. It is also quite soft. I made a wooden wheel of the correct radius and has a groove in the edge of it the same size as the pipe. I pushed the pipe into the groove until it matched. What is not shown, is the section of copper that is silver soldered into to other end of the collar and it is threaded to accept the blast nozzle and blower ring. ![]()  DSCN1416 - reduced by Builder16, on Flickr |
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Post by builder01 on Nov 1, 2018 18:02:36 GMT
I'm not sure why you would need an O ring. A flange, as you are thinking, a few screws, and a gasket works just fine. There are no leaks with this type of attachment and easy to do. - David In terms of what they achieve, I don't see the difference between using an 'O' ring or a gasket really, except you can buy 'O' rings off the shelf. You are correct Roger, I'm not sure what I was thinking!  |
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Lisa
Statesman
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Post by Lisa on Nov 2, 2018 9:50:35 GMT
Cutting the pistons off this bar is going to take a while, just doing a bit everytime I'm in the workshop so my arm doesn't complain too much:  Meanwhile, the steam chest gaskets are made, I used 0.4mm gasket paper and did the holes in one lot by clamping the gaskets between the two covers and knocking a drift through the bolting holes.  This pic' also shows the cylinder drain blanking plugs I made... still need to make two more. I've also started squaring up the lump of cast bronze supplied for the valves. |
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Post by Jim on Nov 2, 2018 18:15:05 GMT
As always you're doing a cracking job building your Blowfly while showing us what can be done with a small lathe, mill and hand tools. You are an inspiration Lisa.
Jim.
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Post by steamer5 on Nov 2, 2018 21:22:19 GMT
Hi Lisa,
You are really keen cutting thru that by hand! Hope you switch arms from time to time! Guess it means you save funds on gym fees, I can see a bandsaw in your future!
Doing a first rate job on those.
Cheers Kerrin
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