Copenhagen Fields & TFW’s workshop
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- GER D14 4-4-0 'Claud Hamilton'
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Re: Copenhagen Fields & TFW’s workshop
The Skittle Alley has made some progress with the coupling rods now made.
The roughed out rods were finished by planing the flutes using a specially ground gramophone needle in a marking gauge using a brass plate as a guide.
https://youtu.be/zhQZFlFfQ14
Next stage will probably be the drive train onto the back axle.
https://youtube.com/shorts/cX5inECDXO4?feature=share
Tim
The roughed out rods were finished by planing the flutes using a specially ground gramophone needle in a marking gauge using a brass plate as a guide.
https://youtu.be/zhQZFlFfQ14
Next stage will probably be the drive train onto the back axle.
https://youtube.com/shorts/cX5inECDXO4?feature=share
Tim
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- GER D14 4-4-0 'Claud Hamilton'
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Re: Copenhagen Fields & TFW’s workshop
The gear head for the Raven NER 4-6-2 has been made from a 6x10x10mm block of brass. This was initially an interference fit between the frames to help determine the worm and worm-wheel mesh.
The frames and block were then drilled for 14BA to hold this position.
The gap next to the opposite frame is just visible behind the shaft. The wheels are not at the final back to back measurement; allowing easy adjustment at this stage. The worm is twice as long as it needs to be and will be trimmed and a thrust washer placed next to the bearing.
The non-bolted side was trimmed back on some sharp Vallorbe files to be clear of the opposite frame (for electrical isolation).
https://youtube.com/shorts/5fE4LGXSAaA?feature=share
The edges of the block were lightly bevelled - it’s engineering, not clockmaking where the edges should be sharp enough to cut…
Tim
The frames and block were then drilled for 14BA to hold this position.
The gap next to the opposite frame is just visible behind the shaft. The wheels are not at the final back to back measurement; allowing easy adjustment at this stage. The worm is twice as long as it needs to be and will be trimmed and a thrust washer placed next to the bearing.
The non-bolted side was trimmed back on some sharp Vallorbe files to be clear of the opposite frame (for electrical isolation).
https://youtube.com/shorts/5fE4LGXSAaA?feature=share
The edges of the block were lightly bevelled - it’s engineering, not clockmaking where the edges should be sharp enough to cut…
Tim
Last edited by Tim Watson on Mon Dec 12, 2022 12:53 am, edited 1 time in total.
- Atlantic 3279
- LNER A4 4-6-2 'Streak'
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Re: Copenhagen Fields & TFW’s workshop
I enjoy seeing the hand-cut / hand-made engineering in 2mm scale - much finer than anything I hope (or intend) to ever struggle with. Most impressive.
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Dec. 2018: Almost all images that disappeared from my own thread following loss of free remote hosting are now restored.
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- LNER A4 4-6-2 'Streak'
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Re: Copenhagen Fields & TFW’s workshop
Bis!
I very much look forward to seeing this loco running, at some future opportunity of viewing Copenhagen Fields.
I very much look forward to seeing this loco running, at some future opportunity of viewing Copenhagen Fields.
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- GER D14 4-4-0 'Claud Hamilton'
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Re: Copenhagen Fields & TFW’s workshop
NER green is pretty bright!
Rummaging through a tobacco tin, I very luckily found some 12 spoke 3’9” wheels that Denys Brownlee had roughed out 30+ years ago, these were correct for the very conspicuous trailing radial truck and just needed finish turning. The front bogie wheels will have to be hand made. The basic chassis should be running soon.
Tim
Rummaging through a tobacco tin, I very luckily found some 12 spoke 3’9” wheels that Denys Brownlee had roughed out 30+ years ago, these were correct for the very conspicuous trailing radial truck and just needed finish turning. The front bogie wheels will have to be hand made. The basic chassis should be running soon.
Tim
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- GER D14 4-4-0 'Claud Hamilton'
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Re: Copenhagen Fields & TFW’s workshop
The gear head and loco universal joint were finished a few days ago; the worm shortened and thrust washers placed at each end.
The cut down teeth on the UJ cover is from an old eccentric Association gear. It makes it easier to turn the shaft by hand.
The brake hangers on the frames were made from pivot steel soldered through holes into place with a very effective solder and flux.
The flux is a very corrosive oil and so the chassis was degreased and then boiled in water for 5minutes.
The next stage was to complete the frame spacer at the front end of the loco; the notches inside the frames are to take the nuts of the studs that will hold the cylinders in place.
The frames were chemically blacked: much better than painting. The drive from the tender needed a chassis, so this was cut out of two layers of phosphor bronze strip sweated together.
The frames were clamped up onto the PCB spacer, held in place by an orthodontic arch expander, and the siting rods (as usual) helped in alignment before soldering.
The Tram Fabrik motor obviously needed the other half of the UJ and so this was also incorporated into a flywheel. This was started on the big lathe in the garage: namely the main body, the smaller diameter UJ section and the 2mm diameter counter bore.
It was then taken into the garret workshop and finished off by drilling the shaft hole (0.9mm with a short section at 1.0mm) mounting the UJ section in a collet in the watchmakers lathe (it’s also much warmer upstairs)
The hole was then taken up in size with a tapered broach until it just slipped onto the motor shaft to within a millimetre of the final position. The UJ slot was cut with a piercing saw and then finished with a slitting file, whilst holding it in a mandrel and a stepped chuck.
The motor itself is mounted in a brass collar with two 14BA studs silver soldered to it. These are then bolted through the PCB spacer.
The flywheel was gently pushed home with some Loctite 601 on the shaft. The whole assembly easily fits into the tender: it could have had a bigger flywheel, but that would have sat quite a long way forwards and not too good as a side load on the front bearing.
The two PCB pads at each end of the tender frames are Araldited in place and slightly raised to keep the body from shorting out the split chassis.
Anyone who has got this far deserves a medal!
Tim
The cut down teeth on the UJ cover is from an old eccentric Association gear. It makes it easier to turn the shaft by hand.
The brake hangers on the frames were made from pivot steel soldered through holes into place with a very effective solder and flux.
The flux is a very corrosive oil and so the chassis was degreased and then boiled in water for 5minutes.
The next stage was to complete the frame spacer at the front end of the loco; the notches inside the frames are to take the nuts of the studs that will hold the cylinders in place.
The frames were chemically blacked: much better than painting. The drive from the tender needed a chassis, so this was cut out of two layers of phosphor bronze strip sweated together.
The frames were clamped up onto the PCB spacer, held in place by an orthodontic arch expander, and the siting rods (as usual) helped in alignment before soldering.
The Tram Fabrik motor obviously needed the other half of the UJ and so this was also incorporated into a flywheel. This was started on the big lathe in the garage: namely the main body, the smaller diameter UJ section and the 2mm diameter counter bore.
It was then taken into the garret workshop and finished off by drilling the shaft hole (0.9mm with a short section at 1.0mm) mounting the UJ section in a collet in the watchmakers lathe (it’s also much warmer upstairs)
The hole was then taken up in size with a tapered broach until it just slipped onto the motor shaft to within a millimetre of the final position. The UJ slot was cut with a piercing saw and then finished with a slitting file, whilst holding it in a mandrel and a stepped chuck.
The motor itself is mounted in a brass collar with two 14BA studs silver soldered to it. These are then bolted through the PCB spacer.
The flywheel was gently pushed home with some Loctite 601 on the shaft. The whole assembly easily fits into the tender: it could have had a bigger flywheel, but that would have sat quite a long way forwards and not too good as a side load on the front bearing.
The two PCB pads at each end of the tender frames are Araldited in place and slightly raised to keep the body from shorting out the split chassis.
Anyone who has got this far deserves a medal!
Tim
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- GER D14 4-4-0 'Claud Hamilton'
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- Joined: Mon Oct 24, 2016 11:37 am
Re: Copenhagen Fields & TFW’s workshop
Excellent work !!
Merry Xmas !!
Merry Xmas !!
- Atlantic 3279
- LNER A4 4-6-2 'Streak'
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Re: Copenhagen Fields & TFW’s workshop
Amazing. What's the exact form of the shaft that connects the two U/Js please?
Most subjects, models and techniques covered in this thread are now listed in various categories on page1
Dec. 2018: Almost all images that disappeared from my own thread following loss of free remote hosting are now restored.
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- GER D14 4-4-0 'Claud Hamilton'
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- Atlantic 3279
- LNER A4 4-6-2 'Streak'
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- Joined: Fri Jun 26, 2009 9:51 am
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Re: Copenhagen Fields & TFW’s workshop
Thank you.
Another stupid question: Do the loops at both ends lie as nearly as possible in the same plane, or are they arranged at 90 degrees? Does it matter?
Another stupid question: Do the loops at both ends lie as nearly as possible in the same plane, or are they arranged at 90 degrees? Does it matter?
Most subjects, models and techniques covered in this thread are now listed in various categories on page1
Dec. 2018: Almost all images that disappeared from my own thread following loss of free remote hosting are now restored.
Dec. 2018: Almost all images that disappeared from my own thread following loss of free remote hosting are now restored.
- kimballthurlow
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Re: Copenhagen Fields & TFW’s workshop
Thank you Tim, that is really fascinating work.
I am sorry but I do not know what the term UJ means?
Kimball in Brisbane
I am sorry but I do not know what the term UJ means?
Kimball in Brisbane
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- LNER A4 4-6-2 'Streak'
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Re: Copenhagen Fields & TFW’s workshop
UJ = Universal Joint - one which allows the parts of the shaft to be at differing angles to each other whilst still transferring the rotational movement.kimballthurlow wrote: ↑Mon Dec 26, 2022 7:47 am Thank you Tim, that is really fascinating work.
I am sorry but I do not know what the term UJ means?
Kimball in Brisbane
- kimballthurlow
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Re: Copenhagen Fields & TFW’s workshop
Thankyou 65447,
I had a feeling it was going to be so obvious as to make me look silly.
Anyway you offered a sublime explanation for the mechanics.
Kimball
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- GER D14 4-4-0 'Claud Hamilton'
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Re: Copenhagen Fields & TFW’s workshop
There is never a silly question and it was remiss of me not to use the name in full before using the abbreviation. I don’t think orientation makes any difference. These ones are at 90 degrees to each other. Previous ones have been in line. I might make an in-line one to try the experiment on this engine.Atlantic 3279 wrote: ↑Sun Dec 25, 2022 9:56 pm Thank you.
Another stupid question: Do the loops at both ends lie as nearly as possible in the same plane, or are they arranged at 90 degrees? Does it matter?
Tim