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Post by doubletop on Feb 23, 2016 6:28:52 GMT
I purchased a second hand Dart in August 2014 with the intention of tidying it up a bit. Here's the story in 6 minutes.
Where possible I retained as many of the original parts as I could........
Pete
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smallbrother
Elder Statesman
Errors aplenty, progress slow, but progress nonetheless!
Posts: 2,269
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Post by smallbrother on Feb 23, 2016 8:25:59 GMT
Absolutely fabulous. Well done.
Pete.
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Post by Deleted on Feb 23, 2016 8:26:56 GMT
what a transformation you have done there Pete...beautiful work and love the way you've put it all together in this recording......brilliant...
Pete
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Post by chris vine on Feb 23, 2016 9:39:30 GMT
Hi Pete,
What is the fab piano music?? Not jealous of your weather at all....
Chris.
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gwr7800
Part of the e-furniture
Member of Portsmouth mes
Posts: 384
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Post by gwr7800 on Feb 23, 2016 9:55:23 GMT
Fantastic very well done, a real credit to you,love the video especially at the end? Got a lady in the bath?
Cheers chris
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Post by doubletop on Feb 24, 2016 5:53:31 GMT
Thanks Guys
I've enjoyed doing it and looking back I can't remember the effort that went into each part. It's just a case of "how do you eat an elephant". The other contributing factor is DRO's on the mill and lathe. Once you get to trust them and work out how the functions can help you things can be done pretty quickly. A bit of maths to work out the datums and then use the DRO's. I bought laser cut conrods and couldn't work out how to hold then and get the reference right. In the end I used some steel bar and the DRO smooth arc function to do the ends. The inclined line function to set two offset pins in a plate to hold the rods at the correct angle for the tapers. The shots are in the sequence. I call it MNC
Chris - the music? originally I used John Mayalls' "Catch That Train" (Blues harmonica accompanied by a steam loco). The copyright police at YouTube complained so I had to pull it. The music I then used was from the YouTube free music library in the "movie" category. I've no idea what its called.
Pete
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Post by Jim on Feb 24, 2016 6:21:32 GMT
Well done Pete, a superb effort I must say.
Jim
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Post by noggin on Feb 24, 2016 19:50:39 GMT
Pete,Nice work,Can i ask you where you got the tap from that you have used in the steam dome,and what it is called,I may copy the idea,Martin evans type always seem to leak when getting a boiler test. Thankyou Garry
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Feb 24, 2016 23:43:47 GMT
hi pete,
a wonderful clip! and excellent end result! you ought to be very proud of your hardwork plus arriving at a loco significantly better than as originallly designed thanks to Don Ashton's input on the valve gear plus your own input.
i remember Ron Gage's example in the Chichester club which was one of the first to be completed to the Dart drawings in the 1980s.
i did press the pause button quite a few times on the clip!
cheers,
julian
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peteh
Statesman
Still making mistakes!
Posts: 760
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Post by peteh on Feb 25, 2016 0:22:41 GMT
Hi Pete,
What a marvellous compillation, and congrats on a lovely runner.
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Post by doubletop on Feb 25, 2016 6:33:22 GMT
Thanks guys. It means a lot to get encouragement from the acknowledged experts. I'm from the 'O' level metalwork 'failed' school and didn't touch a lathe for another 40 or so years Pete,Nice work,Can i ask you where you got the tap from that you have used in the steam dome,and what it is called,I may copy the idea,Martin evans type always seem to leak when getting a boiler test. Thankyou Garry Garry As a result of the NZ dairy and wine industries one thing we are nor short of is stainless products, Here's the link to the valves www.anzor.co.nz/ball-valves/bsp-316-2-piece-ball-valves/productand I used the 1/4BSP 2 piece model. www.anzor.co.nz/exonet/pdf/2-Piece-BSP-Ball-Valves.pdfRated to 1000psi and 400degF but not at the same time. Steam at 100psi=338degF and its good for 400psi at that temp. Although being sold by an NZ company they don't make them. And the price... about 15 quid I have a pressure guage on my valve chest and with the stroudly shut I was getting a reading of 60psi. later in the day I couldn't stop the loco taking off with the regulator shut so something had to be done. With this and all the other fittings I've air pressure tested to 60psi and it took about 5mins to leak to zero. Not perfect but way better than before. Pete |
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Post by kiwinoel on Feb 25, 2016 6:52:37 GMT
I have been going through your posts and have been encouraged no end, I have a question is the expansion link and die block both made from gauge plate and hardened?
Noel
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Post by doubletop on Feb 25, 2016 8:17:28 GMT
I have been going through your posts and have been encouraged no end, I have a question is the expansion link and die block both made from gauge plate and hardened? Noel Noel With the name Kiwinoel you must be in NZ? No its just mild steel bar stock from Steel and Tube and case hardened with "Cherry Red" the Kasenite replacement. I got it from somewhere in the South Island. Christchurch probably. Just Googled and TradeTools do it tradetools.co.nz/products/2874710 but I didn't pay $102. And now I've found the tub and its 1lb and it came from Hayes and Sons in Invercargill The die block is bronze. I followed the logic that making a new die block is a lot easier that making a new expansion link I hope that helps Pete |
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Post by noggin on Feb 25, 2016 19:31:46 GMT
Thankyou for the links Pete much appreciated. Garry
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Post by kiwinoel on Feb 28, 2016 6:53:35 GMT
Pete
Thanks for that I have nearly a full tin of Kasnet E Hayes and Sons in Invercargill would be one of the best hardware stores in NZ, I spent most of my working life in Hutt Valley shifted here to Timaru 7 years ago. Back to expansion links I am machining mine from gauge plate [as I have some] the die blocks will be from phos bronze, I have a Seig SX3 mill it does the job rigidity is a problem and I should have put a digital read out on it when I first got it that would have saved a lot of heart ache and waste material and time.
Noel
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Post by doubletop on Feb 28, 2016 9:38:10 GMT
Noel
As you will have seen from the still shots all this work was done on an SX3. Maybe getting close to its limits on a job this size, but doable. The DROs do make the difference.
Pete
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Post by doubletop on Feb 28, 2016 9:44:39 GMT
Today was the first run with the ball valve regulator. The loco was transformed, it's far better behaved then it was with the stroudley. Another problem resolved.
Next is weight distribution. It was pointed out it is running a bit tail down. There's no water in the tanks just 5 kg of lead up the front end of each. It may need a rethink
Pete
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Post by ejparrott on Feb 28, 2016 9:49:43 GMT
I'd say more lead up front, but there's not many places to hide it!
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Post by doubletop on Feb 28, 2016 19:51:02 GMT
I've been thinking the same. The the front (and rear) buffer beam is already backed by a 0.5" x 1.5" steel block between the frames. That was easier than making replacement angle brackets and made things a bit more ding proof if another driver shunts into the back of me. There is a space on top of the cylinders in the saddle that could take a couple of Kgs if not more. It would mean taking the boiler out again and a block casting to go around the steam and exhaust pipes
Pete
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Post by Jim Woods on Feb 28, 2016 21:42:34 GMT
Hi Pete,
how much adjustment do you have in your springs. maybe all you need to do is drop the front down abit and wind/shim the tail up. getting the springing right can be tricky. I built a weighing bridge for the IOM loco as they tend to be nose heavy over the pony truck. Being leaf springs and compensated didn't help. I ended up having it softly sprung on the drivers and stiff springs on the pony truck. I got the driving axles within a few grams. took a few attemps as you almost work diagonally the wheel base I found. the weigh bridge was just a length of track with a short bit hacked out in the middle. like a wheel drop in full size. Anyway, I used a set of bathroom scales with a lenght of threaded rod so as the screw the moving bit of rail up to rail height and took the reading off the scales. that make sence?
regards
Jim
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