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Showing results for tags 'failure'.
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A sad story about failed project - Roller Coaster
teflon posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
From my young age I wanted to built some contraption that would allow me to run down cars, marbles etc. Along the way I get familiar with Lego 7 mm ribbed hoses, however they slow down the cart quite a lot and were not useful for the purpose. Then a few years later I've seen Zerobricks with his idea for the track (https://www.youtube.com/watch?v=SydmBuTPnKo). A few years later guys from Brickride (http://www.brickride.com/) created their fully functional Roller Coaster so I gave it a try. I started about two year ago and in a couple of months I had some ideas: https://www.bricksafe.com/files/teflon/roller-coaster/Roller Coaster 01.mp4 ... and the majority of track ready to go: The idea was to have a gigantic tower on one side so track would go up on one side, then do slow 180°turn an fall into the abyss with complete loop at the bottom. However the tower was not very stable so I had to change to an A configuration The new tower was about 170 cm high and reasonable stable. After some testing I had a fully functional track with one looping, a 270° + 180° horizontal turns and even track going tough the opening of the looping (sorry for lousy picture, I have no other:-/) Then I started with motorized lift. I used Brickride's idea - chain in a ditch: The propulsion at the curve at the bottom was served with side wheels with synchronized drive (matching the curve of the track with the curve of the drive was a hard task): Here is the detail, where side wheels are pushing the cart to the chain: Ant the top part also needed some clever chain tricks: At least two L motors were needed to power the thing due to its size and some friction. However, all this effort just produced very good lift but managed to mess-up my track. Like Heisenberg principle - either track was working or the lift but not both at the same time. At the time a lot of my pins started to brake and replacing them cause almost a chain reaction, since some force is needed to dismantle the track. Due to that, I even shorten the track to have as little problem with pins as possible. After months of more or less serious attacks on the issue, I realized it's just to big to work properly (with a motor). I guess my support is just not up to the task and I just have to admire Brickride's. In the mean time, we have seen the Lego answer and it's nice enough. Some more pictures of my failed project: Looping: Through the support: And panoramic view: Please note massive girder to support the track. That was my last idea out of desperation to make this track stabilized. I have failed miserably. Well, the lessons learned: Bricks are stubborn, technic ones even more so. More engineering is usually not a solution Building with bricks is not all fun and games There is no such thing as too much pins More pictures here: https://www.bricksafe.com/pages/teflon/roller-coaster -
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This is a collection of unfinished, abandoned cut scenes of brickfilms. I was going to create a Christmas Special, narrated by Vitruvius Vitruvius: Vitruvius and Advent calender: Vader: Miscellaneous: Generic guy with cloak 1: http://gifmaker.cc/P...tput_jdID3Z.gif\ Generic Evll guy with cloak 2:http://gifmaker.cc/P...tput_87Uez6.gif
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4/4/2015, EDIT: This thread has turned into some weird hybrid of a WIP and a 'let's see where I went wrong' thing. I've requested a name change to better reflect that. ~~~ I'm just gonna kill this project now before I regret my decisions: This is what happened when I tried to combine the styling of a 7-wide model from legoman666 ( http://www.eurobrick...howtopic=102535 ) and the mechanics/internal design of an 8-wide model from Commander Wolf ( http://www.eurobrick...howtopic=106654 ). Kudos to both of them for being willing to answer questions via PM, by the way! So, what went wrong? It turns out that you actually need to plan things if you want to do a 7-wide, because there's no good way to try and cram a what I assumed to be 6-wide internal structure into a 7-wide and have anything actually work out right. OH WELL. Could I save this? Maaaaybe, if I was willing to spend way more time than I have on it. Am I going to? Nope. The internal drive system consists of a AA battery box mounted vertically, with two L-motors driving a single four-axle truck each. There's a PF switch crammed in there as an extension lead/motor reversing switch, because I didn't realize until now that the trucks worked against each other if they got turned around by accident. Each drivetrain consists of a 20t bevel driving a 12t bevel, which then drives a series of 12t bevels to bring the power down into the trucks, giving a ratio of 3:5 for in-to-out. If I could somehow lop off everything behind the end of the 6x12 panel and still keep the fancy drivetrain, I'd be happy with the proportions; doesn't look like that's possible, so I'll be moving to a more traditional vertically-mounted motor setup without the extra gears. Maybe losing the extra gears will balance out in that I won't be losing nearly as much power to those gears, so the pulling power and speed will be somewhat similar? On my relatively small test loop, it'll pull five of the six Horizon Express cars (the sixth is the one with the motor and no battery, left out because I already have this engine to test with) plus the two container cars from the Maersk at a reasonable speed. Wheel slippage is definitely a problem, though I suspect it's because all the weight is in the center from the battery box and lack of body structure. The final revision I was envisioning before going to scrap the model would have ended up with the large plates on the side acting as a monocoque skin holding everything together. Leave your ridicule and/or constructive criticism below. Here's a cat picture to make it better:
