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Rotation & angle of universal joint? |
Posted by: N. W. Perry - 2019-10-02, 3:36 - Forum: Help
- Replies (28)
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Since I got such quick and helpful advice on my piston rod question, here is my next challenge: universal joints!
Specifically, how do I work out the compound angles of a double u-joint connection? See the image below, where I need to connect axle A to axle B by using the short connecting axle that's floating nearby.
Here are some parameters: - Axle A is oriented parallel the model's Z axis; axle B is oriented at an angle to it. The connector will have to be rotated in both the X and Y directions, but you can't just set one and then the other, because changing either affects both. I'm guessing the 't' word, trigonometry, will come in again here, but because of the compound angle, I'm not sure where to place the triangles.
- Axles A and B are rotated 22.5 degrees with respect to their longitudinal axes; my assumption is that the U-joint will transmit the same angle to the connector axle, and that while this rotation needs to be accounted for, it won't change the method needed to determine the connector angle.
- I guess I need to determine the rotation of the U-joint hubs at A and B, around both of their local X and Y axes. Again, my assumption is that the hubs themselves, however they may be rotated, will always remain at the same coordinates in absolute space; that is, they always form the point around which the connector axle is angled at each end.
- The end of the axle at B may need to be slid downward along its own longitudinal axis in order to correctly intersect the connector axle; this unknown position makes the trigonometry harder to figure out for me.
Of course, I can (and probably will) just download this model from the OMR and steal the answers from there, but again, I'm keen to know the right way to solve these challenges on my own. And I could also probably work it out by iteratively tweaking each angle until everything appears to line up, but I like to know that I've actually calculated it precisely instead of just doing it by eye.
Looking forward to everyone's suggestions!
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Exposition Internationale des Arts Décoratifs et Industriels Modernes |
Posted by: Ulrich Röder - 2019-10-01, 16:32 - Forum: MOCs (My Own Creations)
- Replies (2)
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To say the least - I have something left for the era of steam engines.
Especially these time, where the Art Deco has been founded - although my love belongs to the "Art Nouveau",
... also termed in German as "Jugendstil".
Simple marvellous!
So I built this steam locomotive - so as this "Lady" should look like, trying to reach a maximum from the real original shape....
..as a relict of those nostalgic "Golden Times".
LDraw delivers some benefits, such as "no Dustcatchers" or "room murdering Vitrines", no Limitations of Brick parts amount or unavailable colors.
Also custom parts, patterns or stickers can be designed without any problem.
Always lovely to begin a new project
So, here it is:
Built in th Year of the Lord 1923 and
highlighted with technical performance-enhancing conversions and with representative paint, this machine was first exhibitioned 1925 in Paris, at
"Exposition Internationale des Arts Décoratifs et Industriels Modernes"
Original:
Name: Gt 2×4/4
"5773"
Later Termed : BR 96
Indicated Power: 1630 PSi
Model:
1 x Buwizz
2 x original medium motors
2 custom Parts: Wind deflector on the cab, drive rod
1 modified part: 3,2 mm pierced 49098.dat (Chimney collar)
a big bunch of patterned parts
BBB Train Wheels
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