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Showing content with the highest reputation on 07/11/2018 in all areas

  1. 2 points
    The balance weight on the leading drivers would most likely compensate for the loading from the coupling rods, the inside crank for the cylinder I would be interesting to work out the relative positions of the driving cranks on a 3 cylinder loco like 800 or a Royal Scot, perhaps a visit to Cultra to solve the mystery?
  2. 2 points
    The 'end wheels' just have half of their respective interconnecting rods to cope with, the centre wheel has two halves of the interconnecting rods and about half of the con-rod from the piston imposed on it.
  3. 2 points
    construction photos of google buildings
  4. 2 points
    Hi popeye It all runs smoothly on test but the valve rod does have to much slop in its bore, as suspected! I will work out a sleeve solution on the second cylinder and then apply to both..... Here are a a few photos of the engine break gear and wheel balance weights erected, these cast iron wheels are really nice it seems such a pity to paint them! The break gear is 180deg soldered and the wheel weights were epoxied on, again like the tender I left a generous gap between the break shoes and wheel tyres for wheel removal for the painting work. Now to complete the other side valve gear..... Eoin
  5. 2 points
    Maybe something like this.
  6. 2 points
    Like Noel catching up on an old but interesting thread. The coach in question, 628A, was a 1978 conversion of 61' 6" bogie parcels van No. 2574. This itself had been converted in 1974 from Standard No. 1619 which in turn had been 1950-built Composite No. 2125, the re-classification from Composite to Standard class taking place in 1972. Dimensions of the coach were: Length over buffers: 65' 6"; Length over headstocks: 61' 6"; Maximum Width: 9' 11ΒΌ"; Maximum Height: 12' 9"
  7. 1 point
    We had a boat, not the size your talking! it had a Volvo Penta Diesel- if you ran the engine for any considerable time and one was sitting down, one got 'white Bum' you know like 'White Finger' using a B&D mouse sander... Eoin
  8. 1 point
    A properly balanced engine is not just 'nicer', it is better in every way - the loads on the bearings are lessened, things last longer, and not just because they aren't shaken off. God knows what was going on in the float chamber of a boneshaker bike..? It's not many years ago that a ferry journey was accompanied by the constant jingling of the duty-free bottles - (although it has its current issues) Ulysses is notable for having almost undetectable engine vibration.
  9. 1 point
    Yes Borithe the main problem with steam loco design, - build it big and hefty, replace it when it comes loose, and no need to change the existing design 'because it works'. This is the design ethos that got steam a bad name... Motor bikes got smoother when the Japs got involved with their lightweight engineering and more modern ways of thinking! I have a few British made 'Thumpers' - a 1961 BSA C15T 250cc single is the worst- at about 30mph the vibrations make it difficult to hold the bars, above that it smooths out again, then close to 60mph about as fast as I dared to go- your vision blurs, there is a brand new Alpha big end bearing kit installed n all! Eoin
  10. 1 point
    Hi KMCE It's quartered, the chap who built the chassis has the left side leading The wheel balance weights are essential on large wheels to counter-balance the weight of the crankpin boss cast in the wheel, the crankpin, and the motions. The inside cylinder is far ahead of the outside ones because the drive is taken from the front axle and the radius rod driving the valve needs to be as long as possible to set up the correct motion angles with the combining and anchor links to control lap and lead to the valve ports..... Eoin
  11. 1 point
    The balance weights on the fore and aft drivers are approximately the same size and since the rear axle only deals with the coupling rod, it is probably reasonable to conclude that the forward driver weight only equates to the coupling rod it supports.
  12. 1 point
    That makes sense! The cylinder positions are as below if that helps with the centre cylinder well forward to allow connection to the front axle. Another question is - are the wheels quartered, or is the system set up on 120deg given the three cylinders? Eoin - How are you setting it up on the model?
  13. 1 point
    True, but what is more interesting is that the centre cylinder operates on the front axle which has the crank and valve eccentrics built in. The axle also has associated counterweights take up this imbalance . Thus, why weights on the crank and wheel - unless the front one is cosmetic?
  14. 1 point
    Very impressive model and structure. Generally with a building of this nature 1-2 floor levels of composite steel decking are installed before the concrete topping is laid, depending on type of decking and span the decking may or may not require propping. These days edge protection and safety netting would be installed to a floor level before the composite decking is installed on a level. The steel decking acts as a crash deck for workers (typically steelfixers & concrete layers) working below the structural steel erectors. Floor design and construction loadings with composite slabs is critical, I had one near miss on a project I was managing about 20 years ago and investigated a couple of composite floor collapses, in two cases the decks were supposedly designed to be self supporting. Service installation/interior fit out can take place on the lower levels once slab meets minimum required strength, it gets a bit more complicated where propping is required as it may be necessary to back prop to lower levels of the building. Generally the planner/project manager would avoid installing cladding to an elevation until structural steelwork and concrete works are complete to the full height of a building to eliminate the risk of damage to the (very expensive) cladding.
  15. 1 point
    Very nice. The balance weight on the middle wheel looks bigger than the others, was this normal?
  16. 1 point
    Stunning piece of work there Eoin, it will be some animal in "O".
  17. 1 point
    Hi jhb Yes, and oil cans, oil cans all over the place- I forgot! Eoin
  18. 1 point
    Oooooooooooohhhhhh!!!!!!! Where's me smelling salts!!!
  19. 1 point
    I'm thinking something like the two smaller tanks in the foreground in that pic..... it would be a comparatively small-scale thing and based in the 1960-3 period when health and safety matters weren't taken as seriously as now......
  20. 1 point
    Hi Guys, I have now developed a range of birch ply baseboards. They are incredibly strong and won't twist warp or sag. Ideal for exhibition use. The frame is 12mm and the cross braces are 9mm with a 6mm top. They are much more expensive than the standard MDF boards due to the cost of the birch ply and the additional time that goes into making them. I found that they are slightly heavier than the MDF boards, as birch ply is quite heavy!
  21. 1 point
    Hi jb It would most likely be a tank in some form of bund- a structure that would hold the full contents of the tank should it leak. The bund walls would be about 1 to 1.2 meters high built of brick or block and lined inside with asphalt in the early days, constructed in concrete with no lining later on. The tank would stand on two rising walls within the bund and the tank would be at a higher level so that if the bund fills the tank would be above the full level and not float! It would not be in an enclosure like a building, generally open above the bund for ventilation. A small discharge metering valve located at one end with hose and standard nozzle would be the associated gubbins...... Eoin
  22. 1 point
    Looks very complicated. If this does not run smooth it might cause some drag.
  23. 1 point
    A couple of things I have learned about designing a model railway, it's really easy to over estimate what will fit in your available space. It's also really easy to under estimate the amount of satisfaction a simple uncluttered layout designed to be operated prototypically has to offer.
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