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  1. GreenTwin

    Hello from PA

    Welcome Gunny, glad to have you in the group. This is an adictive hobby for sure. I have known many who have been at it much of their lives. My dad started building model engines when he retired, and ended up building 38 engines. I was very busy with life until about 14 years ago, when I got an...
  2. GreenTwin

    Hello from the Netherlands

    Welcome, glad to have you. Looks like you are into some interesting hobbies. Please share photos. Pat J. .
  3. GreenTwin

    Prusa XL 3D Printer

    And I have farmed out 3D printing for pattern making too, to a commercial firm that had a high-end printer, and the results were outstanding. Once you get an engine into a 3D model, there are many options available at that point. I think more and more options will emerge over time. The 3D...
  4. GreenTwin

    Prusa XL 3D Printer

    If I ever get a slight break in my workload, I am going to start 3D printing the patterns for this engine, 1/2 scale. With the effort put into making an accurate 3D model, then a 3D printer allows repetitive accurate pattern making. A 3D model can also be shared with others, and then they too...
  5. GreenTwin

    Prusa XL 3D Printer

    Luckily 3D modeling programs and printer prices have come way down over the years, and more and more people are embracing these tools. It was very difficult for me to learn 3D modeling, even though I was very good at 2D CAD. The difficulty with 3D modeling (in my opinion) is not that 3D modeling...
  6. GreenTwin

    Lanz tractor build.

    Looks very good so far. Nice stack with the brass work. .
  7. GreenTwin

    Prusa XL 3D Printer

    More downloadables from the Prusa site. Note: I am not shilling for Prusa, and have no connections to that company, but I do notice that not only does Prusa make nice 3D printers, they also offer a large number of what I call "spin-off" printable items, many of which could be used in this...
  8. GreenTwin

    Prusa XL 3D Printer

    I get updates from Prusa from time to time concerning new developments/methods using the Prusa XL multi-material/multi-head 3D printer. The 3D printing hobby is getting really impressive, with some fantastic new trends, as follows: 1. Prusa's 3D model download page had some impressive models...
  9. GreenTwin

    Stationery engine design

    Part of the secret to long life of old equipment is the massive babbitt bearing surfaces, and the shape of the front of the bearing which was designed to push a layer of oil between the wear surfaces. I have seen a book somewhere (I forget the source) detailing exactly how the old large babbitt...
  10. GreenTwin

    Hello from the sunflower state

    Welcome, glad to have you. Its a great hobby, and there are many new modern tools that can be used to build model engines. Jump right in and lets get building. Pat J. .
  11. GreenTwin

    Silver Solder Torch Selection

    I think joint strength is directly related to joint thickness, if I am reading this article correctly. https://kaybrazing.com/brazing-articles/1000978-the-famous-joint-strength-vs-joint-clearance-chart/ .
  12. GreenTwin

    Silver Solder Torch Selection

    I have had better luck with the Harris black flux (pics attached). When using the white flux, there seems to be a very fine line between getting the pieces hot enough to wick in the solder, but not so hot as to burn the flux. Once you overheat the flux, or keep it hot too long, then the silver...
  13. GreenTwin

    Shows keep getting smaller!

    Throw in the cost of gasoline for a 22 hour round trip, and it is game-over for me. I have been priced out of the hobby market. .
  14. GreenTwin

    Silver Solder Torch Selection

    The discoloration sounds normal to me for steel. I can't comment on what to do about that though. Congrats on the silver soldering; you are on a roll ! .
  15. GreenTwin

    Silver Solder Torch Selection

    From my limited experience with silver soldering steel parts together with high-temperature silver solder, there is a bit of an art to getting the two (or more) pieces hot enough to flow the silver solder, without overheating the flux at the joint line. The thing that really needs to happen (in...
  16. GreenTwin

    Shows keep getting smaller!

    To me, it is like when the monks or others take care of the ancient scripts/books, while civilization waxes and wanes. If the knowledge can be preserved somehow, then that would at least give the opportunity of a renaissance in the hobby one day. If every model engine that has ever been built is...
  17. GreenTwin

    Shows keep getting smaller!

    Without deepdiving into a lot of quasi-political/economic ideas about why society is changing, suffice it to say that technology has changed society very dramatically in the last 200 years, and there has been an exponential change since the advent of modern 3-phase electrical systems were...
  18. GreenTwin

    P.M. Research #5 Steam Engine

    Sorry to hear that. Hope you recover soon. .
  19. GreenTwin

    1/3 Scale Ford 289 Hi-Po

    So nice.............. .
  20. GreenTwin

    Hello from Sweden!

    Welcome Peter, glad to have you here. Almost anything can be achieved with the right amount of time and effort (in my opinion). Sounds like a very interesting project. Please keep us up to date with your progress. Pat J. .
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