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Everything posted by Divitis
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This. This is off topic in this thread and reads like a marketing push, especially since every other post you make includes it. Let's please now drop it from both sides and get back on topic. I'm personally going to be happy with more 'everyday' cars in the 1:8 lineup as they might help differentiating features. A V4 engine might give space for... valves? 😁
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General Part Discussion
Divitis replied to Polo-Freak's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
For small builds, something like the C shaped 3x2 beam/frame with holes in different directions from a few years back is a useful and inherently flexible part (which nobody saw coming). Conversely, this s-shaped beam does not truly open new possibilities, rather simplifies what can already be achieved with two 3x3 thin liftarms and some tinkering with the adjacent structures.- 5,504 replies
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- rant!
- Bionicle Technic
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General Part Discussion
Divitis replied to Polo-Freak's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
My two cents: New Lego technic pieces introduced in the past 5 years or so are generally great as in they open up new possibilities (visual, mechanical) rather than only simplifying engineering or assembly (making it easier to achieve something thanks to a specialized part). This S shaped beam falls in the latter category. Not impressed.- 5,504 replies
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Hey @Brick900 only seeing this now. I think it's a very nice project, but maybe you went a bit too far on the texturing. The 1x1 tiles sticking out of headlight bricks, the columns build with cones, the wedge bricks with the 'cuts' underneath... all together they hide the building's main lines, which are interesting by themselves and should get the spotlight.
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As I'm designing a building, i was looking at color options for the facade, and it struck me that we are stuck with only white - LBG - DBG - Black when for all other hues there are so many more options. Am I the only one missing a 'Warm light gray' (likestone) shade or a 'Very dark gray'? Here's a IRL reference of buildings which I don't feel can be reproduced with what's available. Ps: I couldn't find an existing thread where to post, please move this as needed to keep things tidy.
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Definitely two axles, like in the original. In fact, I would go for two axles for the trailer as well, there seem to be real life counterparts: I owned and loved this set, so I'm following this project closely.
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GBC General Discussion
Divitis replied to Jim's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi folks, just letting everyone know that sport balls are available on Pick a Brick for 66 cents (at least in Italy). LEGO® Pick a Brick | LEGO® Shop ufficiale IT Maybe everyone knows about that, but last time I looked they weren't there.- 1,124 replies
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Heavy duty disc CVT
Divitis replied to Divitis's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Some progress. The motorized contraption spins fast enough for the balls to escape. Now for some better bracing and I can move on to motorizing the sliding of the driving gears on the disc. I'm thinking of using a chain to be have full control over the timing - any suggestion is very welcome! The rails with the wheel on top somewhat visible in the back are the 'ball accelerator' which will propel the balls inside the cone from below. I wanted to use gravity but the tower was going to be ridiculously tall. Will post a video of it once it works properly, the prototype was satisfying but I must have messed up some distances when rebuilding it here. -
Heavy duty disc CVT
Divitis replied to Divitis's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
That's a very compact implementation indeed, how was the torque and reliability? What's really working well (for my standards at least) in my design is driving the disc from both sides. This ensure good traction while eliminating the need to brace the large disc to make it spin perfectly flat, which generates lots of attrition. One day, this will become a GBC module. Balls will enter the conical basket from below, that's why the opening in the base, and then exit from above once the cone spins fast enough. I also need to time the CVT so that the cone only reaches 'escape velocity' for a couple seconds and then slows down and keeps going slowly for some time, while more balls are loaded in. In terms of ratios, I should be able to get to 4:1, which should make the change in speed interesting enough. This requirement dictated the two pieces design, spinning a disc with a hole and basket directly on top means that the closest to the center I can get with the driver wheel is 5 studs. And the disc would need to be 40 studs in diameter to have the 4x velocity change. A bit impractical. -
I am building something big, both in scale and ambition. The first module is a heavy duty CVT with minimal friction, capable of spinning significant mass (that cone is heavy) at high speed and... with a hole. (21Mb gif, give it time to load) So far, so good, I think. I'm really happy with the inertia it has, even when spinning it from a bare axle which is rather disadvantageous force wise. Will try motorizing it next. Feedback is welcome, and I'll share the LLD with anyone interested.
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In the real life version, there is nothing. That controls the shifting of the racks, their 'eccentricity' The input is the banana gears, which one would have to spin by hand. Not super practical but I thought it'd be enough to see if things are working before complicating things even further. Yes. My bad again. For now the simplest solution is replacing the 7L axle on which they sit for a 5L one and leave them without bracing at the top. Given things move slowly it should still work. I also noticed I only included one bracing/stopper for the 7L rack (the white 1L liftarm). Another should probably be placed on the other side of the 7L rack. Thanks! Kudos for your patience :)
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Oh poop! Quite a basic case of 'building digitally where everything is stationary'! I only put them there to support the banana gears from below, so if you feel they are not needed, toss them away. Otherwise, maybe they can be moved to the last holes of the dgb flip flops maybe? Very glad to hear the progress on this. My Lego is still all in moving boxes!
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I am sorry to hear. I had no idea and apologies if my comment was inappropriate in any way. That's an interesting prototype, even though technically you're right that it's stepper operated. From what I read the problem with ratcheting CVTs is that the output isn't linear. I reckon the four arms inside a planetary gear help with that, but then they further smoothed it out with elliptical gears (not sure how that works but we don't have those in Lego anyway) So, no takers? with 4 diffs, 5 turntables and 16 banana gears laying around? ;)