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Hello everyone, let me introduce my latest MOC – Mammoet PTC-200-DS Ring Crane made of Lego Technic! This particular model attracted me for a long time, but since I saw it on YT installing the highest wheel in the world at UAE, I decided to investigate it’s building.So I started from calculating it’s scale and number of wheels required. Railway ring set up crane’s scale. Then I decided to make 4 ¼ carriers with two 1/8 halves inside, each on 4 train wheels. So, all in all I required 32 train wheels. So, I started to look for them on BL.Building started from these 1/8 carriers. I wanted each wheel to be driven to spread the torque all over the chassis. So each ¼ carrier is driven by L motor. Totally 4 L motors rotate 32 wheels for crane rotation :)Then I started to build main superstructure (half). Build two similar halves and connect them. Then installed winches, counterweight box and booms. There is not too much information about this crane in the network, so my build is based on some youtube videos and browsed images of the crane. I would not able to get any info from the company directly. So the crane may have some differences from the real model. And for some reason I can't say this is a scale model. For examble real crane has two rings with 64 wheels on each. Obviously, I can't build a model on 128 train wheels - this sclae is simply out of my budget.I was dreaming of a crane which would be able to lift up to 1 kilo. Luckily, this crane one can easily uplift even 1,5 Kg 😊Crane is powered by classic PF elements: 4 L motors for drive + steering rotation, 4 XL Motors for 7 winches. I recommend using 4 BBBoxes as a counterweight. Although only one is connected and needs to be charged. It would be simple to switch crane management to SBricks or Buwizzes (as there are five separate functions, you’ll require 2 sbricks or two buwizzes). Installing PU system instead of PF may become a challenge, especially for carriers. If you have only one battery box - this is not bad, crane is stable even with one battery box as a counterweight, but, obviously, it can't lift a lot or make a horizontal poisition. Crane is 210 cm high in the current configuration at it's highest position. Can lift 1500 gramms or maybe even 2000, but I didn't give it a try to save parts from stress. Fully RC with 5 channels with 3 IR receivers. Can be layed horizontally and back to working position without human help. More images Ah, building instructions are already complete and ready: https://rebrickable.com/mocs/MOC-77733/OleJka/mammoet-ptc-200-ds-ring-crane/#details
Ok folk, been working on this for a while now, please excuse the rubbish pics but im sure you get the ideaIve still to get a few power function parts for the base but the upper section is all working and had a lift of 2kg so far but with plans of trying for a bit moreOne thing im strugging with is, the two main winches in the body are run off the same motor and have to wind/unwind at the same speed but im strugging to get the string to wind nicely on the spool, anyone any ideas?Ok this is a 1:50th model of the real machine im working from