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  1. GreenTwin

    George Vontorne's propane tank sand muller

    That turned out very well. And it is quiet too. You could always add a more conventional wheel(s)/scraper arrangement if you don't get the muller effect that you want. .
  2. GreenTwin

    P.M. Research #5 Steam Engine

    I have seen some use a torch to heat a gray iron casting, to anneal it, and a buddy of mine uses an electric kiln to do the same. I will check with my buddy to see what temperature he uses to anneal his gray iron. If I were going to anneal gray iron, I think I would use a kiln for a more even...
  3. GreenTwin

    Hello from musical instrument maker

    Welcome Mat, we have some very good machinists here (I am a mediocre machinist, but I can get by and make things function without binding). I use information I gather here for off-topic designs, such as building foundry equipment. As far as I am concerned, any information is useful information...
  4. GreenTwin

    P.M. Research #5 Steam Engine

    Nice perseverence. Sometimes one has to get a bit creative to make things happen. Makes me think that a pre-machining annealing session may be a good idea for some kit gray iron castings. Looking good so far; nice work ! P.S. - Nice lighting on the photos; I always seem to get dark shadows and...
  5. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    I lost the source on these photos (not mine). The links would appear to be two-piece, bolted together, with a forked connection on the side ? So the slot in the link is 90 degrees to the typical position ? Am I seeing that correctly ? .
  6. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    The links on this engine appear to be curved launch-style. Photo copyright by "Historical Society of Western Pennsylvania". .
  7. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    This engine has a locomotive-style link, which apparently is not curved. There are actually three eccentrics per side on this engine. .
  8. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    Locomotive links have the eccentric rods attached outboard on the ends of the link, and launch links have the rods attached inboard of the ends of the link. This would be a launch-style link. The link should not be suspended from the end, but rather in the center, if you want equal valve travel...
  9. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    The correct suspension point of the link is at the center, slightly offset towards the eccentrics a very small amount. I have seen a white paper about how to calculate the exact point for the suspension pin so as to equalize valve travel in both forward and reverse gear positions, about like...
  10. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    Here are some pages from old steam design books. Perhaps some of this can be applied to our tandem compound. .
  11. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    Steam engines went through a long period of evolution, and one has to try to zero in on the particular time period for the engine in question, to find information that may apply. I am assuming from looking at photos of similar engines, that this engine has a standard/typical Stephenson's link...
  12. GreenTwin

    36x60x54 Twin Tandem Mill Engine

    Stephenson's link configurations varied; ie: the link could be curved convex (with respect to the crank), concave, or straight, and the rods can be crossed, nor not crossed. There are also launch-style links, and I think what are called locomotive links. The link suspension point is critical...
  13. GreenTwin

    Powder painting a flywheel

    I agree, he is just drawing the powder away from the part, into the filter. I mentioned this earlier. He will get it all ironed out, and find out the optimal configuration for things. There is a certain amount of trial and error when learning/setting up a new process. Us armchair folks can only...
  14. GreenTwin

    USS MONITOR SIDE LEVER ENGINE

    If you study the Battle of Hampton Roads, there were some impressive technical achievements on both sides. The south recovered the burnt Merrimack, and rebuilt it into an armored (with wood) ironclad (woodclad to be exact). The rebuilt Merrimack (the Virginia) was a formidable gunboat, and it...
  15. GreenTwin

    Hello from Poland!

    Welcome, glad to have you here. What sort of engines are you building ? .
  16. GreenTwin

    Powder painting a flywheel

    Technically speaking though, you are using a questionably calibrated oven setting to verify a questionably accurate thermometer, and so you may not really know whether you are getting a accurate reading or not. I suppose a modern oven may have a pretty accurate microprocess/thermocouple, but...
  17. GreenTwin

    USS MONITOR SIDE LEVER ENGINE

    Ericsson's ironclad was far from perfect, and I have read about many notable gaffes in its design, such as the fact that it was not seaworthy, ventilation was bad, the turret was not stopped before firing the guns, and so no accuracy at all, and the vulnerable observation post at the front of...
  18. GreenTwin

    Powder painting a flywheel

    Without using a calibrated thermometer, the temperature measurements you are making may not be accurate. I have been fooled by this on a scale, when weighing sand and other materials. .
  19. GreenTwin

    Sweet sixteen traction engine boiler.

    There was a very long thread about stainless boilers posted somewhere, and I recall there were a large number of folks who were adamantly against it for a number of reasons. I seem to recall some sort of degradation of the stainless under the heat and pressure, which made it unsafe. I will look...
  20. GreenTwin

    1/3 Scale Ford 289 Hi-Po

    "Is it real, or is it Memorex ?" .
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