Dave21 Posted October 24, 2015 Posted October 24, 2015 Dave21 posted what looks to be the same axles in the axle thread a few hours ahead of your post. Was his post inspirational? Yes, this are my axles and aminnich has asked if he can use it and I gave my okay So I think it was inspirational Dave Quote
nerdsforprez Posted October 24, 2015 Posted October 24, 2015 The number is not so important as the good grip (contact with the ground)... You can move it also with 2 axles... for ex. in my crane when I put the main weight of superstructure on non driven axles, I got problems with grip because driven axles were not so loaded... from this reason is very good solution to use suspension at least on driven axles to maintain good contact with the ground... as I said... you can move the crane also with 2 axles but with that under the turntable... Max... This is true max....but I think a problem here is that with such a large crane, the chassis is bound to twist and turn. No matter how tough it is built, because of the weight and well b/c we are dealing with Lego here. Therefore, even if 2 axles have good grip in one part of a drive, they may not in another. Even with the very slightest, slightest change in terrain (and I am even talking about paved terrain) the chassis might lift so slightly off the ground that the axles wont have the friction necessary to drive the beast. Quote
aminnich Posted October 24, 2015 Author Posted October 24, 2015 Yes, this are my axles and aminnich has asked if he can use it and I gave my okay So I think it was inspirational Dave I was having some trouble with a driven steering axle, so when Dave posted his axle (which was exactly what I wanted) I jumped on it and asked if I could use it. I take zero credit for this axle design, 100% his idea and it works great!! As for the friction and twisting concern, I haven't driven it around yet, when I do I'll post a video. But I hope to finish my contest entry today Quote
andrewganschow Posted October 25, 2015 Posted October 25, 2015 I was having some trouble with a driven steering axle, so when Dave posted his axle (which was exactly what I wanted) I jumped on it and asked if I could use it. I take zero credit for this axle design, 100% his idea and it works great!! As for the friction and twisting concern, I haven't driven it around yet, when I do I'll post a video. But I hope to finish my contest entry today I see something beautiful and massive taking shape, I’ve always wanted to add one or two more axles to 42009. However, leave the boom the same length, and make a frame for it to rest on the crane chassis. Quote
aminnich Posted October 25, 2015 Author Posted October 25, 2015 the picture I posted with the axle set up is just an idea. Im going to add the XL motors (lookin at 4) As for the number of axles, it may decrease, not sure yet. Quote
aminnich Posted October 29, 2015 Author Posted October 29, 2015 (edited) Hey guys, Im seeing a lot of great TC8 contest entries coming up of no where this week. I really hope i can get it done, but it isnt looking good. But i did forget to give a small update on the massive crane. I added drive, 1 XL motor for a pair of driven axles for a total of 3 XL motors, Im slowing figuring out a steering gearbox that is functional and compact. Here are a few pictures. (the yellow panels represent where the outriggers are and length) oh, and what do you think, regular boom or lattice??? Edited October 29, 2015 by aminnich Quote
A Gallifreyan Cat Posted October 29, 2015 Posted October 29, 2015 Wow, that's looking great! I think a regular boom would look better on this kind of crane. Quote
aminnich Posted October 31, 2015 Author Posted October 31, 2015 Sooo, i have had like zero time this week to do any anything LEGO, but i did have some time in between a class yesterday to do some LDD. I tried to make a steering system, basically i would slide the axles to change the steering mode. It is way simpler than a gearbox, but i dont know if it will work. Quote
MaxSupercars Posted October 31, 2015 Posted October 31, 2015 (edited) Niceee... and of course it will work... on the ONLY ONE longitudal side of the crane...for ex. at the rear... at the front you have to swap the racks on other side of axle for normal steering and add another racks for crab steering... so you need 2 racks per axle... and other wheel mount point because of 2 racks... hmm... ...or maybe better solution would be to ensure that the front steering half axle rotates in opposite way as the rear half... that ensures to move the racks in the right way and there will not be needed 2 racks per axle... I would rather do this... I'm glad that you continues in the work... because I make ideas with you also for my mobile crane... Thank you that you do not give up... :) I'm looking forward for next progress... :) Max... Edited October 31, 2015 by MaxSupercars Quote
aminnich Posted October 31, 2015 Author Posted October 31, 2015 Thanks max!! Regarding switching the gear racks I have a super simple solution. I'm using two servo motors, one for the front 6 axles another for the back 6. This way I can control each one separately with 2 channels Quote
MaxSupercars Posted October 31, 2015 Posted October 31, 2015 (edited) OK... :) Hmm... next question... when I look at your picture... I assume that front is on the left side... You have made the gear ratio change to change the steering angle in normal mode... How many times do you want to make this gear change? After every axle or after every 2 axles? That 2 axles in pair will have the same steering angle? Because if not then you need to change the distance between rack and axle on 1 axle from the pair and then you got problems by crab steering... Max... Edited October 31, 2015 by MaxSupercars Quote
aminnich Posted October 31, 2015 Author Posted October 31, 2015 The front 5 axles will be paired with their radius, the middle 2 will be straight except for crab mode, then they will steer. But the front and back 5 axles will have different angles because of gears not arm length, because then that would mess up crab steering Quote
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