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This model is my Lego Technic Braiding Machine which debuted at the 2015 Brickworld Lego Expo in Chicago (June 17 - 21 2015). There are three bobbins of thread that travel in a figure eight (8) pattern, causing the threads to intertwine and create a braid. A spool then collects and slowly winds up the braid. At Brickworld, once the collection spool was full, I cut the braids into lengths about 20cm (8 inches) long and handed them out to kids as friendship bracelets. This model was well received, and was nominated in the 'Best Mechanical' division. The toughest part of building this model was getting the timing of each mechanism just right. To keep everything in sync, only a single M-Motor is used. The other challenge that I faced was keeping it running for extended periods of time. All of the moving parts of the model would slowly work themselves apart, and the worm gears wanted to force the model apart any time one of the bobbins jammed. I hope you like my model, and all comments and feedback are welcome. Special shout-out to Nico71 for inspiring me with his braiding machine and looms. If you haven't seen his models, you should check them out (Nico's Blog).
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Do you want to do ropes ? I have a solution ! I want to precise this braiding is not 100% reliable. Sometimes, a coil can block the machine. After the first prototype, I done a lot of modifications to have the best reliability, but I have not so mutch experience with this type of MOCs, and a V2 is necessary to upgrade this creation. There is a clutch to stop this machine if it is blocked. The objective was to do a braiding machine having a continuous operation, and to have a not too low speed. I had not objective concerning the number of strings. There are 8 strings + 1 central. I also really wanted a buttom to be drawn to start te machine and down to stop it. How does it work ? You can separate this machine in 3 parts : The braided wire winder The rotation of the trays The movement of the arms moving the coils You can have more tight braids by changing a gear ratio of the winder. But they are less beautiful. The rotation of the trays occupies the top of the machine. (The 24t that you can see can be easily used to coordinate the arms and the trays) Here you can see the mechanism of the arms : The linear clutch stops the machine if a coil blocks it. More picture here : http://www.techlug.f...43.html#p179043 The difficulty was to coordinate all the mechanisms and to counter stress and flexion of the parts for the machine can work without too much fails. Finally, the machine can be locked because of a coil, but I’m satisfied because it works correctly and the braids are very regular. I’ll done other MOCs of this type because I like it ! The video will show you the operation :
