Marxpek
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Everything posted by Marxpek
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So here is some update on the stroller, excuse me on the bad lighting my time and resources are limited. The gun system has been fitted into the tub, it might move one or two studs forwards but everything fits like planned in my mind.. The 2nd function has also been built in by now, 2 pneumatic actuators, a compressor and a switch have been used. So can anyone guess what the 2nd function will do? More soon.. -
[TC12] The Unrollable
Marxpek replied to kodlovag's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
This is one great design, i do miss the wacky part a bit, but it is an amazing car! -
Hihi, not really, the inspiration actually was our new born baby and the gear that came with it..But it would have been a nice theme! My aim was to make a powerful gun with a remote trigger, since you only get about 10 shots from a cartridge, they should count, most machine gun constructions fire the bricks faster but much weaker, but most importantly, you can not accurately decide when to fire a single shot with a machine gun, This was my main goal, load the gun while driving, and fire it when the time is right. So maybe this is more like a Howitzer or shotgun rather than a machine gun. And thanks for noticing my little Technic fig story, wanted to spice the demonstration up a bit :)
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Update on wacky function number 1: I built this gun to exactly fit the baby stroller's tub. The clutch release system is really powerful and reliable, rotating the motor one direction loads the gun, and rotating the motor the other direction makes it fire. The entire thing should be "hidden" in the tub, which of course will need a rebuild around this gun.
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well be careful with the vinegar that too eats metal, its kind of fighting fire with fire... alcohol after to remove the vinegar!
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You can take them out, one of my 8366 was in a similar state when i bought it, same issue, and i took them out, fully open it up, then CAREFULLY use a flat screwdriver to push/hammer them out for the other side. i also found little pieces of acid on the board but not enough to do any damage. Clean any part that got in contact with acid with vinegar and a toothbrush, and soak the batteryconnectors in vinegar. Use very little vinegar on a cloth if you have to clean electrical components on the board. Clean with alcohol after and lightly sand it the battery connectors. 2 battery connectors are wired, i was lucky enough to have no acid on those, but you could solder them off and on after cleaning. I think it is worth the effort, currents will flow better and your unit will last longer.
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did you take them out and cleaned them with vinegar? the battery acid will work its way inside over time if it is not removed fully, and can damage the electrical board. hehe i do not consider a repair a modification, modification means changing or improving parts. I say great job and must admit i am jealous for that price!
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Those are pretty expensive, great equipment, but i would not dare to strap a 500 euro camera on my racer.. besides that i think that they are heavier and bulkier then cycling computers. I bought them separate, a 1080p@60fps (or 4k@30fps) action cam for 60 euro and gps cycling computer for 60 euro. I use them on separate occasions and should one get destroyed it is "only" 60 euro compared to a gopro5 (400-500?) Well any run i do gets filmed with my action cam mounted to my bike so yes, but i do not recall if i took pictures of all the designs i made (4 or 5), i have a habit to forget taking pictures... i will have to dig through my photos a bit. I did drive over one of my designs... had to happen someday, it cut me off the road while it was overtaking me, loose parts in the steering ... luckily it went into the grass and i drove over it there. damage was minimal: just a 15L liftarm went to heaven, nothing else. luckily... Sadly not in the shot of the camera.
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So here is another small update, it reveals the design idea and what is its based on, a baby stroller. Roughly 1:3 scale, like the original it can be taken apart and folded for easy storage, the locking mechanism and the steering handle remain to be designed and built. If there is time left i will design a "kiddy buggy" attachment, just like the original has. and one with the source of inspiration: The design is not by far final, especially the bed-area (what is the English word here? bucket? tub? please help?) needs work, but the idea is there, although racing a RC baby stroller is pretty wacky to me, the functions should become the most wacky part, hopefully...
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that's either a scam or you are very very lucky! i wish you the last of course! just get a GPS device.. but good you took the speed computer to the non-driven wheel, but the GPS device will eliminate all the non-believers since it shows more then just speed (altitude, acceleration, ect.) agreed sitting still is no fun, (will you enter the tc12 contest for fun?) but i hate redesigning before i can test... and that remains a problem here as well.. bad bad weather.. but when you double up you can double up your testing speed, good thinking! ;) I hope i can test mine this weekend, let's both pray to the weather gods..
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2 weeks ago, of course on video and recorded with gps, not sure if i took detailed pictures of that design, but there is always video. @TechnicSummse i see you took the suspension advice... i'm pretty sure you will remove it soon, I did... But it is kind of fun to see you do all the tests i have done a few months back (never documented, i was not on the forum). Althought the scale of the bumps is a valid arguement, i do not believe in suspension, mainly because we cannot make good suspension, just springs is no great suspension (only makes it bounce longer, since they do not have dampeners). My very first speed record actually had suspension, but when I took it out i got way better results with the same design on a rough test track.
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"note too self": read first, build later! It will not be a problem, but thank you for bringing it up!
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Good to see your progress, i have been away from the site for a while, so a lot to catch up, and did not read all here but i noticed this: I see you took my "shopping cart steering" and have some issues with it, i can tell you your steering should be reduced, maybe try a fake engine crank shaft, that helped me to reduce steering, one drawback is that under 30km/h you will not be able to steer very effective, but that is not really interesting to us.. I hope I will find more time to break my current max speed of 39.5km/h on the "bumpier old 35km/h racer track".. soo close...and my redesign has been untested yet, but is a more promising build! (bluffing to keep you on your toes?!?) Good luck!
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After being absent from the site and constructing with Lego for a while, because of the vacation time, a new job and a new kid, i found this contest and some inspiration! The idea's are about completed in my mind, the framework and basic rolling chassis has been built, the wacky function remains to be built, and when i find more time/idea's i will try to incorporate a 2nd wacky function. True to my style of remote racers: this thing will be fast and most likely uncontrollable. (most of you will know my speed record racing attempts by now, still working on it with great results but available time and weather, limits my progress) I might not finish this project in time, but i will surely try and but will surely finish this just for the fun of it! I hope i will find the time to incorporate both wacky functions i have in mind. I'm planning to use: 1 or 2 s-bricks (maybe with a analog bluetooth joystick), 3x L-motor 1x m-motor and a servo motor. Here is a picture of the bare rolling chassis,(excuse me for the messy background, like i said before: we just got a baby here, make the house/life messy), Can you guess what vehicle it is based on? And what would the wacky added functions be? more pictures incoming soon!
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Same story here, tried it and dumped it. I very much like the KERS-system, but i wont be any help in our quest for 40km/h+, the pullbacks do not add any energy here, even worse; they take away energy from the motor and we need every little bit.. it helps with acceleration, but not with top speed. However, maybe the ratchet release system can work for a booster unit at the start for our racers, but it still does not help with top speed, just acceleration, but we always like a shorter track, less time to crash on a shorter track :o
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100% certain. The grey ones always where grey and non shiny and it clearly is no wear but a different type of rubber. The grey ones are also the newest. The 42036 set is the last set made that uses these tires. So the softer grey is the new version i guess.
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The grey ones i had are from a 42036 set i bought myself. So those are fairly new.
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looks like you have the black, yours have a bit of a shine to them in the pictures and they look black to me. I have no idea, maybe ask the seller? But i doubt many people are aware of this difference..
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here is a small update: correct! did not work... crashed twice, gave up the steering setup, but turned it around and drove the other way with relatively decent results, but i did not dare to go full speed on a inverted caster setup. so i had to redesign the front again to brace the wheel properly and give it the correct caster. I also found what could be a game changer on my part, i found that there are 2 different types of rubber used in the 94.2 motorcycle tires, hard black ones and a bit softer grey ones. The grey ones were the ones I used all the time, but i think the harder black ones I just received via bricklink have more potential, since they don't show any ballooning at all, the grey ones did, at max rpm without load. So now there are 2 black tire for drive and a grey tire for steering in the front. You can clearly see the difference in the photos here, the black ones also have a bit of a shine to them, the grey ones do not, but the grey ones do seem to have a bit more traction, but i think the harder black tires will run better because they have less "bounce" to them. pictures: Do i dare to keep the gps computer there? it sits perfectly there, but it is very close the the ground... Steering relies on caster and a return to center spring, which in this case is also the (only) pivot point on the frame, the wheelbracket houses the wheel, and can only move half a beam width right or left. Steering is very limited now but can be easily changed to give it a slightly smaller turning radius. It now weights 1075 gram total, maybe i'll add the bucket again to see if it creates lift :D And of course as always, terrible weather, but i'll be running outside once i get the chance.. with high hopes as always!
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O man.. this sucks.. i recall me writing this as one of the most likely things to break first, sad to see it happened to you man... maybe you can glue a tiny piece of wood in place for the tabs?
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to compensate for this; the steering movement is so little that under 15 km/h you barely notice it steering, but it will have to prove itself over 30 km/h yet (i have done a 25 km/h+ test run in the street with this setup but with the motorcross tire in the rear) i saw that ramp in one of your videos i think, it is a play ramp for pullback cars? seems a bit to big, but i guess it is very light? but worth a try, would at least to be fun/easy to compare results on a car, the bucket also acts as a bumper here, protecting the rc unit in a frontal crash, i do not think i dare to drive it without the bucket, since the rc will be fully exposed in the front without it.
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So it has been a while since there was an update, here is what has been changed. - running on 3 motorcycle 94.2mm tires now. - 2 driven front wheels - caster steering setup in the rear - weight reduction, totaling 1083 gram including speed computer. - more narrow and aerodynamic design Some pictures: This racer is the longest design yet but it still is only 1083 grams as shown on the pictures, the rear steering setup is still based on caster, the steering was made for small corrections and besides the caster helping it to return to center, there is also a "hockey-spring" installed to give more stable steering. The more narrow and more aerodynamic design should also help a bit. For now the gearing remains 1:3 from the slow output, which i might change again soon, but i want to test and compare this to the small steering wheels setup from earlier ("just 36.2" with that). And that is where the story ends for now: waiting for a good day with some spare time to do some test runs, as always: high hopes!
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@TechnicSummse Looking good! maybe a bit wide. I have not had a lot of time on the forum lately, but i have been doing some development, i'll try to post some today. Looking forward to your results! (weather remains bad here..)
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Future MOCs
Marxpek replied to Epic Technic's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
This is something i had in mind a while back, a Hinowa LightLift, jam-packed with functions and a nice technical challenge i think, i just lack the parts to make it at the moment. Maybe someone likes to try it? -
It is always worth a try, have fun!