jorgeopesi Posted July 22, 2015 Posted July 22, 2015 I didn´t like too much my first dumper so I began a new one. This one have different features, front and rear live axle, Ackerman steering and it will be pneumatic so that I will have much time until I can have the new pneumatics . Here you have some pics, I was trying new configurations over the arocs suspension, I hope you like it. Functionally as narrow as possible. Rear live axle with central arm to prevent lateral displacement. In black would be a nice tumbler . Front live axle with Ackerman steering. It has to be reinforced because it has 19 studs between wheels and I don´t know yet what I will use, small linear actuator, steering rack or worm gear. The frame is provisional just to put the wheels. In the end I wanted something like that in technic style. Tests with the suspension for the dumper based on the arocs suspension. Thank you. Quote
TheItalianBrick Posted July 22, 2015 Posted July 22, 2015 Jorge will you use the new pneumatics aswell? That would be great! Looking good so far! I'm just not keen on the steering axle.... Quote
Jurss Posted July 22, 2015 Posted July 22, 2015 You could use in steering pneumatic cylinders, like hydraulic in original Quote
jorgeopesi Posted July 22, 2015 Author Posted July 22, 2015 Jorge will you use the new pneumatics aswell? That would be great! Looking good so far! I'm just not keen on the steering axle.... Yes, I want use the new longer pneumatics and I don´t understand very well what you say about the steering axle, my googlenglish doesn´t help me a lot... You could use in steering pneumatic cylinders, like hydraulic in original I thought the same it would be perfect for a live axle but the problem would be to have a good steering. Thank you for all comments. Quote
lcvisser Posted July 22, 2015 Posted July 22, 2015 Maybe the perspective of the photo is misleading me, but the Ackermann setup seems to be inverted. At least, from the photo it looks like the outer tire is steering more than the inner tire, and it should be the other way around. In any case: it looks good! I like the rear axle setup, from what I can see of it. Curious to see the end result Quote
jorgeopesi Posted July 22, 2015 Author Posted July 22, 2015 Maybe the perspective of the photo is misleading me, but the Ackermann setup seems to be inverted. At least, from the photo it looks like the outer tire is steering more than the inner tire, and it should be the other way around. In any case: it looks good! I like the rear axle setup, from what I can see of it. Curious to see the end result You are right , I turned it today . Quote
TheItalianBrick Posted July 22, 2015 Posted July 22, 2015 Yes, I want use the new longer pneumatics and I don´t understand very well what you say about the steering axle, my googlenglish doesn´t help me a lot... Good news then!! Well what I meant is that I don't like the way you designed the front axle! But it's just my opinion! Anyway as Jurss said you shoud use the pneumatic for steering! You have 6 studs to play with...so should be fine! Maybe you can build a double circuit pump that runs constantly with a M motor....so everytime you want to steer the pressure will be ready! Quote
MaxSupercars Posted July 22, 2015 Posted July 22, 2015 Anyway as Jurss said you shoud use the pneumatic for steering! Pneumatic steering? It will not be precise or? Max... Quote
Victor Imaginator Posted July 22, 2015 Posted July 22, 2015 Pneumatic steering? It will not be precise or? With return-to-center any steering mechanism will be precise enough imho. Quote
MaxSupercars Posted July 22, 2015 Posted July 22, 2015 With return-to-center any steering mechanism will be precise enough imho. Ahh... OK... So simple steering... Max... Quote
TheItalianBrick Posted July 22, 2015 Posted July 22, 2015 Pneumatic steering? It will not be precise or? Max... With return-to-center any steering mechanism will be precise enough imho. To be fair it won't be 100% precise, but let's say to have pneumatic steering it's more fascinating!! I don't think the point is to be precise anyway as this vehicle it's not fast anyway! Quote
jorgeopesi Posted July 22, 2015 Author Posted July 22, 2015 (edited) Good news then!! Well what I meant is that I don't like the way you designed the front axle! But it's just my opinion! Anyway as Jurss said you shoud use the pneumatic for steering! You have 6 studs to play with...so should be fine! Maybe you can build a double circuit pump that runs constantly with a M motor....so everytime you want to steer the pressure will be ready! In fact I have redesigned it today because I didn´t like it too much I have a new one better than the arocs uses. The pneumatic steering won´t be precise but it will work and it is the more easy system to put in a live axle. I have to put 3 motors, 1 battery, 2 receptors and 1 or 2 autovalve pneumatic yet... it will be fun . After two hours of trying... pneumatic steering live axle would work... but I would need room, pneumatic autovalve and a big frame for everything... discarded I will build independent suspension. These are the pics of the experiment. Edited July 22, 2015 by jorgeopesi Quote
ritztoys Posted July 22, 2015 Posted July 22, 2015 Looking forward to see this completed, is this the 797B you talked about a long time ago? I hope so.............. :thumbup: Quote
jorgeopesi Posted July 22, 2015 Author Posted July 22, 2015 Looking forward to see this completed, is this the 797B you talked about a long time ago? I hope so.............. :thumbup: Can be any of the large ones . Quote
jorgeopesi Posted July 23, 2015 Author Posted July 23, 2015 More of this beast, I still have a lot of room for the pneumatic autovalve and another receptor in the front side . If I have room enough with everything on board I will try to put an Ackerman steering to make it more realistic. Maybe I should make the steering slower too. http://www.youtube.com/watch?v=e3BMUcXSgqU&feature=youtu.be Quote
Victor Imaginator Posted July 24, 2015 Posted July 24, 2015 To be fair it won't be 100% precise, but let's say to have pneumatic steering it's more fascinating!! I don't think the point is to be precise anyway as this vehicle it's not fast anyway! Maybe using rubber band for return to center will help... now i start to want pneumatics, i wasn't planning buy arocs) Quote
Alasdair Ryan Posted July 24, 2015 Posted July 24, 2015 I think you should consider extending the wheel base by a couple of studs,it looks too short as it is at the moment. Quote
Karle Posted July 24, 2015 Posted July 24, 2015 It seems to me that trying to use pneumatics for steering is making the design more complex that it needs to be and then only "good enough". I suggest that you keep it simple (KISS) and use mini LA's for more positive, controllable, steering. Quote
jorgeopesi Posted July 24, 2015 Author Posted July 24, 2015 Thank you for all nice comments. I think they are good proportions for a liebherr Alasdair. Quote
jorgeopesi Posted July 27, 2015 Author Posted July 27, 2015 (edited) More progress so far, almost every functional part put I only have to put the pneumatic hoses. I had room enough for everything . Edited July 27, 2015 by jorgeopesi Quote
jorgeopesi Posted August 18, 2015 Author Posted August 18, 2015 More progress again, fully redesigned I wanted ackerman steering and I got it, now I have room enough to hide 2 receptors and battery. http://www.youtube.com/watch?v=b9uZlJXU9Sg&feature=youtu.be Quote
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