Walschaerts Valve Gear Lego Steam Engine
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- Опубліковано 29 вер 2024
- Working Walschaerts gear built from nothing but Lego bricks!! And even runs without the combination link! A very big engine, two standard plates long, with a nine brick stroke made possible my the use of a lego beam rather than the lego cross-rod. Took some real inventing to make that work, I even had to find a new way to attach the piston rod to the 8x8 stud piston head. Now I have a very tight connection that will never come off! The beam I used the 15 hole long type, but I could use longer ones. I demonstrate the valve gear in forward, then reverse, then neutral, to hopefully help some understand more about how this more complex gear actually works. I also show that the combination link, the two arms attached to the crosshead, are not needed for the gear to function. They are just there to help make the motion smoother. I love this model, even though it is very plain compared to my other models, and I hope that this helps everyone!
ahhh, jeeze i cant believe i missed this! Fantastic engine once again, im very interested on the piston rod seal! that valve gear has something about it, almost mesmerizing to watch! It looks like its hard to build/finicky to time right, but obviously well worth it. Great vid, thanks
Nice! I have a Lego Walschaerts, too. I also have a Lego Corliss with a working trip gear and a Baker. You can find the baker on brickshelf by searching for paul-dieter if you're interrested. Sorry I can not upload video. I joined youtube just to tell you this is excellent work! I think this is your most advanced engine so far. I look forward to the Joy. A Baker, however would be a logical next step and will run better without the need for that pesky curved link.
Silly me, it makes it go forward then reverse, then neutral! Sorry, I didn't read the description :)
What's the point of attaching the valve rod to the cross head? It doesn't look like it supports any weight.
Wow! What does the adjustable worm gear thing do? I didn't notice it doing anything,
Great model!
Very, VERY late reply, but the worm gear assembly allows adjustment in the cutoff, and the complete reverse of the engine.
this is beautiful.
Do you actually have cutoff control with the Johnson bar?
Thanks for your kind words. The Baker is thrown together to prove the arrangement. It runs far better than it looks! Your eloquent style is beautifully suited for the observation of motion. Running slow definitely enhances the enjoyment of a smooth running engine. As far as the piston is concerned, I'm very standard about that. I invariably use a 4x4 cylinder with a throw of 7 lugs. The piston is a 4x4 turntable. The piston rod is a 12. Four old style 1/2 bushings with teeth hold it.
In real life this connection is very important for cut off.. If you slow down the motion, you will see that as the piston concludes its travel, the opposite motion provided by the lead variable (the difference between the piston valve and where the radius connect) helps keep the valve open longer. When you start to cut off for steam expansion this ensures that the valves opens up enough..
one of your best of all time everything is so smooth and theres no stall in the moving parts at all it reminds me of the moving parts on a steam engine from the 1800's great job cant to see what you do next
very beutiful! i love ur engines and this looks kinda complicated to build.also do u have instructions for the hit and miss engine that u built ???
My accucraft live steamer didn't have the variable lead. I was so disappointed :(
Can you show us how the piston rod connects to the piston?
Wow great engine! Any chance of a train to put that on?;)
i have made a curved expansion link