millman
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Post by millman on Jul 26, 2021 12:19:41 GMT
For anyone wanting globe valves PM Research sell casting sticks to make your own, in two sizes. Castings are sold by Forest Classics and Macc models. I have no connection to any of the companies. Price last time I bought some was about twenty quid which means a globe valve for a fiver and a bit of machining.
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millman
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Post by millman on Jul 16, 2021 16:30:59 GMT
William I think if you shop around you would get a 2 1/2 gauge boiler for around £1500 based on the fact that Maidstone engineering are currently listing Rob Roy and Juliet boilers for that price. Ayesha should be a fairly quick build being slip eccentric valve gear, the cylinders are easy to machine and if you do mess one up will not cost a fortune to replace, maybe I am biased, I started building a 2 1/2 Toby during lockdown and am a member of the 2 1/2 association, at your age you have plenty of time to move on to larger things later, not like us old pensioners who have to decide very carefully what to build as we only have time for one more loco build, if we are lucky!
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millman
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Post by millman on Jul 8, 2021 6:55:16 GMT
I built a Gemma many years ago when the castings were supplied by a company up in St Helens, think it was called MESAS. I had trouble with the valve gear, hardly any port opening and by this time the design had been sold on to Hugh Mothersole, the chap that bought up a lot of Don Young’s designs, I contacted him and eventually I got a drawing of the corrected valve gear, I don’t know if the drawings were ever updated by Hugh Mothersole before he sold out to Reeves.
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millman
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Post by millman on Jul 2, 2021 10:28:07 GMT
I try to do all my annealing over the Christmas to New Year period when we light up the open fire, lumps of steel are buried in the fire a couple of hours before we retire for the night and the next morning they are still warm, covered in scale, but once that is removed they machine without any movement whatsoever. I hope open fires aren’t banned for a long time!
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millman
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Solder
Jun 19, 2021 8:28:01 GMT
Post by millman on Jun 19, 2021 8:28:01 GMT
Bob, I seem to remember reading that Rolls Royce used lead to fill imperfections in their car bodies, from what I remember they used quite a lot!
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millman
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Post by millman on Jun 16, 2021 9:49:43 GMT
Aah I wondered why a couple of the construction series finished half way through in the early days of E.I.M, as you say David not being paid is a good reason not to continue.
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millman
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Post by millman on May 29, 2021 11:04:23 GMT
Kerrin, any chance you could provide details of David Hudson’s profiling tool and how it works, I have 24 passenger trolley wheels to machine in a few weeks time.
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millman
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Post by millman on May 27, 2021 9:38:38 GMT
You are correct Malcolm Lucky 7 was written up in Live Steam magazine, I cannot remember what dates though.
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millman
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Post by millman on May 20, 2021 16:28:12 GMT
Is it fixable?
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Post by millman on May 16, 2021 13:06:47 GMT
You’re right Will, it is the shovel. Seen it done many, many times.
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millman
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Post by millman on Apr 24, 2021 16:18:21 GMT
Bob that may be the case with British made chucks but as this is a Polish import there is no guarantee that the jaw slots are square to the chuck body, even though the jaws may be at 90 degrees, also using your method does not guarantee the jaws are square, one could be 89 degrees and the other 91 degrees, they would fit together perfectly but not squarely. Four jaw chuck jaws are obviously jig ground and they are usually located on the tenon to square them up. Many, many years ago I worked at Pratt Burnerd / Crawford collets in Winchester so have a little knowledge of chuck manufacture. The error we are looking at, 30 thou in about 5 inches, or 6 thou per inch, one degree being seventeen thou per inch, this is about a third of a degree or 20 minutes error, I would say that the chuck body sat on a bit of swarf in the fixture when the tenons and threads were machined.
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millman
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Post by millman on Apr 24, 2021 10:00:51 GMT
Steve, can you put a centre in the headstock and then mount the 4 jaw chuck on the spindle, mount a test bar between centres and then lightly close each jaw in turn down onto the test bar, you should then be able to measure with feelers or fag paper which jaw or jaws are out of true. Make sure the tailstock is in line before you do this and if you don’t have a test bar a bit of silver steel would be good enough if you can accurately centre both ends, it only needs to be long enough to stick out just in front of the jaws.
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millman
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Post by millman on Apr 10, 2021 13:35:57 GMT
Have we established that vivb actually has a griptru or is it an ordinary chuck fitted to a backplate?
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millman
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Post by millman on Apr 10, 2021 9:02:04 GMT
You don’t say if the chuck body is internally threaded for the Myford spindle or if the chuck is mounted on a backplate which then screws onto the spindle. If it mounted onto a separate backplate you could take a small amount off the diameter of the register so the chuck could be tapped true and then fully tighten the bolts. If the chuck has an internal thread I am afraid there is not a lot you can do to improve its accuracy.
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Copper
Mar 18, 2021 13:41:55 GMT
Post by millman on Mar 18, 2021 13:41:55 GMT
I thought it was C106 for boilermaking but am most probably wrong, why do you need a supporting pack to present to boiler inspector, I know for steel boilers c of c are required for all materials but as far as I am aware none of this applies to copper boilers at least in UK.
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Post by millman on Jan 27, 2021 9:19:02 GMT
Dear old LBSC described a very similar everlasting blowdown valve in his Shop Shed and Road book, three pages of drawings and instructions. I think I have seen Doug Hewson listing castings for an everlasting blowdown valve but that was a few years ago.
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millman
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Post by millman on Jan 8, 2021 20:31:50 GMT
Thanks cplmickey I will give it another go, don’t find these online forms easy.
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millman
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Post by millman on Jan 8, 2021 16:01:41 GMT
Just tried to get a quote and gave up, found the site difficult to navigate, asks if you are a club member but only gives option of northern or southern fed, 7 1/4 gauge society and a couple more, gave up at about this point, I will wait until I see them at a show, whenever that may be.
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millman
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Post by millman on Jan 4, 2021 15:47:43 GMT
Just tried and page is slow to load, eventually loads but no pictures, about a minute later I get pictures. Going by the happy new year message the site has been updated today.
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millman
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Post by millman on Dec 30, 2020 10:35:56 GMT
I don’t think it matters what you build, as long as you are building something.
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