tkel86

I created a smale site with some useful tools for Lego builders, for now it has two tools to find liftarm connections and one to combine several gears and obtain the ratio and output speed. I hope to create some more tools in the future, and update the gear one with the newer motors and gears. Feel free to propose some tools that you wish existed. IDEAlexis.pt To the moderators: I hope this is the right place to post this otherwise feel free to move it.

1 - the game ends with the gameover sound after 3 failed shots, the program stop and you have to press start for a new game. 2- the pistol is an IR power function remote controller, the infra-red light can only come out through the barrel of the gun, so it focuses the IR light beam. each figure has an EV3 IR receiver in the torso (1-stud hole in the middle of the figure), so the player has to point with some accuracy to the sensor of each figure, and the transmitter can not fire for 2 targets at the same time. Can you see how it works, its just like the real thing (below) but a think they use a laser instead, Lego don't have them yet, IR has to do it?

I'm here again to present a new MOC hope you guys enjoy this one. It's a mix of EV3 / Technic and System build, it use a PF remote controller to shoot the figures, each one got a ir sensor at their back. It's very reliable even with a lot of light and it's really a lot of fun. If you miss more than 3 times it's gameover.

it is not at all robust, when we move it, it does not dismount but it shakes a lot. It is not a very serious problem because what was important to me was just the mechanism.

Just to share with you guys a little MOC i have done some time ago. Hope you like it.

5:10 6:6 1:4 10:3 11:2 12:1

There is a 2 X triple stage counterweights inside the tower but you're right they should be heavier to slow down even more the fall. I thought of using 1x2 plates but i didn't had the required quantity. Some poor quality videos:

So it's done, i had to remove the studio top light to fit this MOC.I'm quite satisfied with the final result. Although i didn't have time to apply led's at the top, I was able to do all the other goals.

3. DROP TOWER (TOPIC) The tower is fully automatic, it operates with 2 motors, 1 M and 1 XL, it uses an old Pole Reversing Switch (970653-1) to toggle rotation. It has two modules one support and one with the chairs, the first serves to raise the second as well as to alternate the rotations, the second will rotate as it rises and is in free fall when it reaches the top. Inside the towers there is a set of counterweights that are triggered during freefall to soften it. The rotation alteration automatically deactivates the opening and closing of the doors. The cycle repeats indefinitely.

It's pretty much done, just waiting for some stickers and that's it. It is not 100% perfect, but given the deadline this will have to serve. My biggest problem and what annoys me the most it's that it doesn't fit my homemade studio.

Now the hard stuff, the mechanism, i'm using 2 motores one XL for the lifting/descent and one M to alternate the rotation of the XL. I could use a single motor and force the gearbox or pf swith to prevent a stop at the middle, but by experience that solution tend to be unreliable. So i'm using 2 motors. the XL alternate the M rotation when the module reach the top and the bottom and the M rotation alternate the XL rotation . That way it can't be stop. I made this first working version, it's quite messy so a few minutes on LDD and i got a better, stronger one. Time to rebuild that. ps: let me know if I do too many updates.

last night new update: It's getting pretty good so far, alll the mecanisms works as plan, the platform, the winch, the mechanism for changing the rotation still and the slow down mechanism have to be made, i think i will try first the counterweight idea. sorry about the photo i'm using my phone.

After sometime thinking about the slowdown motion for the end of the fall, i came out with this idea: So when the module came near the end i can stack counterweight after counterweight and that way slowing down the movement. I just thought of that because it looks kind of reliable. now i got to choose which mecanism to test first, this one, magnets or Whitworth Quick return.

I thought about it, but the module coming to an end will bounce and I do not like that effect I would prefer and try something that make a smooth stop.

Love the ideia @Doug72 but i will need to convert the translation motion to a rotation one for a winch and multiply by a lot to get the lenght of the string, the torque may be too much. Nonetheless i will give it a try. @Seasider a safety system is being developed by our best engineers to predict possible physical damage. :) A schema to explain my plans:

Hav you tried to lift the arm, with the drum turning? I'm curious if the centrifugal force have any impact when lifting? Another ideia, maybe too much crazier, but hey upside down people is not exactly the safest thing.

I just thought about dropping the module in a free fall. It's true that it will last half a second but it will be a good one, at least I expect. To slow down the fall I thought of several options,lego imans (i love them and i think they are kind of undervalued parts) would be the most innovative and realistic choice but also the hardest , if it does not work I will experience a very very very small "slope" applied to the wheels on either sides. Upward launch wasn-t in the plan the rise will be constant, because there is 2 modules, the one with the chairs and another one separated that only goes up and down like in the video exemple. Last night updates:

Your ideia made me think about the mecanics of all the movement, as you can see i've made the swing ride some time ago, but i couldn't improve it more because of the minifig scale limit. So i think you should focus in integrate all the macanics inside the center pole, because if you try to run the top part and the bottom one you can't transfer a tilt movement to the top even if it's made with pneumatics the tubes will end up blocking the bottom rotation. Maybe with the scale you're using you can put everything inside the rotating part, including battery and receiver. In the picture below you can see that in the left model everything above the red and green turntable rotate independently but the red turntable rotation will also engage the linear actuator. The right model it's just an exemple with the motores inside the center pole (i didn't put the batterry and receiver neither the rising mecanism but the principle is the same)

FINAL RESULT: The tower is fully automatic, it operates with 2 motors, 1 M and 1 XL, it uses an old Pole Reversing Switch (970653-1) to toggle rotation. It has two modules one support and one with the chairs, the first serves to raise the second as well as to alternate the rotations, the second will rotate as it rises and is in free fall when it reaches the top. Inside the towers there is a set of counterweights that are triggered during freefall to soften it. The rotation alteration automatically deactivates the opening and closing of the doors. The cycle repeats indefinitely. - more than 1m in height - only 2 PF engines - two independent modules the two go up and the lower one unlocks being in free fall. - the lower module turns when it is rising but not when it is descending - The chair security bars opens when the top module reaches below and joins the lower module. - led lights on top _______________________________ Hello,this contest is the best, so this time I decided to participate , I have always loved Theme Park Rides and I have done quite a lot in lego but never one 100% technic. I have already chosen and started a new project, it will be inspired by the Drop Tower, I already have more or less everything in mind and I have already defined the parameters: - more than 1m in height - only 2 PF engines - two independent modules the two go up and the lower one unlocks being in free fall. - the lower module turns when it is rising but not when it is descending - The chair security bars opens when the top module reaches below and joins the lower module. - led lights on top Extra- the doors of the ride open and close with each new cycle. I already started yesterday building the lower module. and as expected the mecanhism to rotate the chair didn't work as designed, but after some minutes trying other solutions i came with a better. Some LDD sketchs: More updates soon , I hope.

For some time now I have this tool online but now I have made some improvements and I think it is very useful for both technic and system builders. http://tkelcreations.blogspot.com/p/blog-page_24.html I hope you like it and find it useful. Let me know if you have any ideas to improve it.

Thank you for all these positive comments, as I have promised I will try to finish the LDD file. Soon I will also create a manual version without motor.

It's on Lego Ideas : https://ideas.lego.com/projects/124948 please if you like this project support it

Thanks i´m glad you all like it! The 0937 Park was made by me (photos ), the rest of the city layout is from the 0937 community event Arte em Peças (photos) and the hot dog truck was made by Alex (photos). I don´t have yet presented all the rides because the park remains in display on a exposition.

The top tilt to both sides and when it stop it just stay on the last angle. It doesn't return to center, the rubber is for smoothing the tilt movement.

It is controlled by a variable speed controller, those used in trains. In the video is only in third speed variation, it can go slower, if I put the seventh (max) chairs begin to lie flat and can probably fly for real. This ride will integrate a new version of this amusement park that a already done some time ago. Park 0937 by Alexis Dos Santos, no Flickr