Sorry readers for not posting for a while, I have been extremely busy building something rather large! Before I post about that, here is a really cool PDF document from TexBrick.com about building large LEGO models using studded techniques.
Building Big (warning its 7.5mb)
I was lucky enough to win a set of 3 48mm Rotacaster multi-directional wheels from a competition held on BotBench. These wheels are built to be compatible with Lego axels.
I have great plans for these wheels but first I thought I would put them through a simple weight test. Now according to the website the wheels can take up to 35KG per wheel however I don’t think the plastic Lego axels can!
I spent around 15 minutes building a rather simple platform to test out the wheels on. 2 of the wheels were directly connected to 2 PF XL motors (1 per wheel). The main point of this test was to see is how much weight a simple layout could move and more importantly turn.
Once I get a rough idea of the basics then I can scale it up for my bigger models using more gearing, more motors or even more wheels. As stated in my previous post, moving heavy weight is my biggest issue when building my robots.
In my opinion, 2 non geared xl motors moving and turning 12.5 kg of weight is pretty impressive! Maybe I should use them to move my son around the house:)
For more information on these wheels, please visit Rotacaster.
I saw someone make one of these on Eurobricks and was blown away by it. I had never seen one before and instantly wanted to build one however I held off for a bit and worked out how it worked that week while travelling to work. Once it got to Friday night and the wife went out, I decided to see if I could make one without using any online resources. I also decided to make it in studdless technic beams instead of my usual studded build.
2 hours later and here it is! Extremely happy about this especially as it did not take long to build. I actually fancy building one a lot bigger than this. Maybe 2-3 foot round.
While I take the train to London, I have plenty of crazy thinking time and so I think about what I would like to try out. So when I get home I build little simple projects like a 3 speed automatic transmission.
So this works by centrifugal force, the faster the motor turn the yellow thing (will think of a more technical name) the more it expands and pushes the center axle up. This forces the gear changes. The motor is controlled via a RCX as it was part of a display.