andythenorth Posted January 1, 2015 Posted January 1, 2015 I figured out a new build, it's 2 studs narrower, and strong enough for this size of truck Will post pics later. Quote
andythenorth Posted January 1, 2015 Posted January 1, 2015 I got sidetracked, and reversed the 12:20 gearing to be 20:12. The result is insanely fast; not as fast as Sariel's buggy, but still fast. Very little torque, as expected. Video is poor quality, but eh For anyone who thinks you somehow need a diff when using one motor per wheel, the video also shows that you really really don't. (2x L Motors, one PF switch to reverse the direction of one motor, one PF servo). Quote
aminnich Posted January 1, 2015 Author Posted January 1, 2015 once my shipment of motors comes, I will post a pic of my design idea, not sure if it will work. Hopefully it comes today Quote
andythenorth Posted January 1, 2015 Posted January 1, 2015 Flickr album of one axle I've built a second axle and reversed the gearing back to 12:20. It has enough power to pull a couple of KGs at fair speed on level ground. Top view Bottom view. The triangles should be replaced with 3x3 L liftarms, the triangle is forced against the motor shell. I think they could be left out altogether if more ground clearance was needed. They add strength, but I don't think they're 100% necessary. All in all, it's a strong structure, and easy to mount to a model. Quote
aminnich Posted January 1, 2015 Author Posted January 1, 2015 Thank you for being so helpful, I would have been stuck without you. My idea was very similar to yours. It look pretty strong and I think that is how wide it is going to get.. Look great, im going to build this and mine and compare the strength (once the mailman comes ) Anyway, thanks again for all your help and I will keep you posted on my progress. Quote
andythenorth Posted January 1, 2015 Posted January 1, 2015 I'm kind of hijacking your thread But building a strong powered axle for 8285 / 8258 sized trucks is fun. I'm going to use it to finish this, which has been in cupboard for [too many] years: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=307694 I stuck up another couple of videos, 2 powered axles, with and without load. This is back at 12:20 gear ratio. Quote
aminnich Posted January 1, 2015 Author Posted January 1, 2015 haha it is fine. I hope you also find success in using this great idea. thanks for the videos, but for some reason i cant view the videos (dont worry about it) Thanks for all your help again!!! Quote
Epic Technic Posted January 1, 2015 Posted January 1, 2015 Wow I'm impressed at how you managed to make it so compact, I might borrow some of this! Quote
andythenorth Posted January 1, 2015 Posted January 1, 2015 (edited) The L motor is basically awesome, powerful, fast, compact, easy to integrate. Any time you're considering an M, ask 'will an L fit?'. It's hardly any bigger. More power is always better, right? The L doesn't beat the XL for power, even with 2 together, Philo's site shows that two L motors do not deliver power as efficiently as one XL. But the L is easier to integrate to some models, and has a good speed range for vehicles without requiring complex gear + inefficient trains. Lego should ditch the M motor in favour of a slightly more compact S, with lots of pin holes ('BI' points). Maybe 3x5 (M is 3x6), with a curved shell that won't clip nearby gears. Wouldn't need to be super strong, just powerful enough to do things like steering, switch gearboxes, run lightweight functions in small models. Edited January 1, 2015 by andythenorth Quote
aminnich Posted January 1, 2015 Author Posted January 1, 2015 I agree, the L motor has got to be the best of all the motors, because of everything you said Quote
andythenorth Posted January 1, 2015 Posted January 1, 2015 (edited) Got some more crappy videos. Shot with a phone in one hand, quite hard to steer and control speed with the other hand. I swapped out the tyres for the 62.4 tyres. Wondering whether to add suspension for the challenge of it, or just let the chassis flex (working fine like that). It's really fun to drive A single IR receiver can't drive all 4 L motors at full power; it works, but there's more power if 2 IR receivers are used, one for LH side, one for RH side, both on same channel + colour. There's even more power (and battery time) if two battery boxes are used, one per IR receiver, but that's not essential. More weight = better pulling performance, and the steering needs weight over it, otherwise the truck tries to drive through the steering angle (straight lining). Driving performance with a load: https://www.flickr.c...in/photostream/ Obstacle performance with a load https://www.flickr.c...in/photostream/ Obstacle and driving without load. It's really responsive, but the driver lacks skills (hits the wall at the end). https://www.flickr.c...in/photostream/ Edited January 1, 2015 by andythenorth Quote
aminnich Posted January 1, 2015 Author Posted January 1, 2015 I watched all the videos you sent, and OMG I was not expecting that at all. The vehicle you make is simple but it has two battery boxes (weight), 2 receivers, motors etc. but I was surprised at how fast it moved!!! I was planning on using two battery boxes and two receivers, but i have to figure out something i can do for weight over the steering. I do have one quest though, in 2 of the videos the vehicles seemed to have two speeds. You didnt sneak a gearbox in there, did u? that would be impressive. anyway, i am very happy with the outcome of your idea, a great combination of speed and power!! Quote
andythenorth Posted January 2, 2015 Posted January 2, 2015 I'm using the proportional (train) PF remote for drive, so 7 speeds available. The bang-bang (stick) remote is better for steering though, so I use one of each on different channels - hence the third IR receiver Quote
aminnich Posted January 2, 2015 Author Posted January 2, 2015 so if I don't have a train remote, will my truck go the faster speed all the time? Quote
andythenorth Posted January 2, 2015 Posted January 2, 2015 (edited) so if I don't have a train remote, will my truck go the faster speed all the time? Yes. Train remote is pretty cheap if you needed one: http://www.bricklink...4429&colorID=86 Edited January 2, 2015 by andythenorth Quote
aminnich Posted January 2, 2015 Author Posted January 2, 2015 ok thanks, I think I am just going to stick with the regular remote Quote
andythenorth Posted January 3, 2015 Posted January 3, 2015 (edited) Weight and speed tests 7.2kg load, truck weight is 1kg. On level ground, speed is 0.5 metres / second, or 1.8km / hr. Edited January 3, 2015 by andythenorth Quote
aminnich Posted January 8, 2015 Author Posted January 8, 2015 My L motor shipment finally came!!!! I build your design (andythenorth) and it worked great, lots of speed and has enough power to do the job. I did not build the whole truck yet, but that will be coming soon. I did run into a very small problem. The batteries in the different battery boxed had different amount of life left in them. so one wheel was spinning faster than the other, and it just went in circles. That is a quick fix though Quote
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