sanjy009

Hello, I'm building my own custom LEGO holonomic wheels in an EV3 Killough Platform (see previous post here: http://www.eurobricks.com/forum/index.php?showtopic=86692&st=100#entry1718813). I've used 3 large EV3 motors, but my own design (following LEGO dimensions as much as possible) of an omni-wheel. You can see how 'bouncy' the ride is, they are built for manoeuvring rather than speed, though I can see a real life use for motorised wheelchairs/ mobility scooters. On other forum topics (especially your detailed one Aswin) there is some discussion of steering controls. I've found the Mindstorms android app is really great to use on a tablet to control the 3 motors, I just wish you could fit more onto the screen.

I've updated the robot with an EV3 and a stiffer frame around the wheels. This greatly helps stopping sideways loads pulling the wheels off the rims: Here's a video of it in action (contains soundtrack): And I've started casting an improved wheel design that fits nicely onto a LEGO rim, plus dyed black: see more here: http://idintern.word...olonomic-wheel/

Thank you very much. The biggest learning from the (unfinished) project for me is how well made LEGO is and how good their tolerances are, almost too hard and costly to copy, unless you have a specific modification or custom piece in mind.

Hello, I found this forum after my blog post about making my own holonomic wheels was featured here: http://www.eurobricks.com/forum/index.php?showtopic=86665&hl=%2Bthings...+%2Bsteering+%2Bquestion+%2Bsomething+%2Bawesome+%2Bcame+%2Bacross I’ve done lots of 3D printing of my own custom LEGO, and Shapeways is the best I’ve found. 3D printers like Makerbot and Up! with ABS and PLA are good, but don’t quite have the resolution or tolerance yet to match with real LEGO. Shapeways “White Strong and Flexible” is sintered nylon dust, so the resolution is much better but it isn’t as strong as ABS, especially considering any 3D printed part is only about 30-40% as strong as an injection moulded part. It’s fairly expensive too at the moment. 3D printing is best suited for prototyping, and really good for casting. Anyway, you can see all my experiments and iterations with 3D printed LEGO here. I’d like to hear what you think: http://idintern.wordpress.com/2013/04/06/lego-holonomic-wheel/ Last week I bought the Mindstorms EV3 and I’ve ordered some more motors from Bricklink, so soon I’ll get the robot updated, but for now it’s a RCX 2.0: