morson1

I have a hard time doing things "halfway" Maybe between axles is correct then. I´m just a little worried about the fact that both axles will then need to slide a little when steering, and maybe that will cause that sometimes axle no1 has best traction, next second axle 2 and so on, and that it will make the truck do strange movements when turning. Well well, in time we will see how this turns out...

Hi, Trying to build a truck here, and have a question about Ackermann steering geometry. My truck will have two driven rear axles, fixed axles, non of them steerable. If you look at the attached picture, which alternative is the correct one? Should I line up my steering according to the blue lines, pointing at the center of the first rear axle? Or should I aim for the red lines, which points at center between axles? Or are both alternatives wrong, and in that case, what is the correct solution? Thanks!

I´ve been building numerous solutions the past days, but nothing turns out good. This is the last one, feel free to laugh..: It is WAY to big on the height. Guess I´ll have to give the LA:s up, they are just to space-consuming!

Just to clarify, the axle isn´t supposed to open/close the claw (that is still unsolved), it will only be used to rotate the claw. It will swing free if I have some sort of free-wheel. Well it will not swing free if I engage the motor, but else it will. I already have a MOC forest machine, and there I´ve solved the rotation with the micromotor, and the claw open/close with pneumatics. However, this one will be much bigger, and remote controlled. Having a universal joint hanging in the micromotor will not be good enough on this model, and as I want it remote controlled I don´t want any pneumatics on the model. EDIT: Here´s a pic of my older MOC:s claw.

No the 87408 should be able to swing freely as it wants. It´s for a forest machine, the claw should hang in the axle pointing downwards. See link: My link My black arm is the red arm in the picture.

I´ve found that if I don´t power both Z20, the U-beam wants to rotate as soon as the axle pointing downwards encounter resistance, which it will. The U-beam must not rotate if the mentioned axle is under heavy load. Also, another problem.. I need some kind of free-wheel between the Z20 gears and the motor. The reason is that the U-beam needs to be able to rotate without any rotation of the axle pointing downwards.

Hello I need some help figuring out a solution for the MOC I´m working on. Let´s start with a picture: Basically, I need the 87408 beam to be able to rotate almost 360 degrees around its holding axles. At the same time I need rotation to the axle in the middle of it, independent of the beams position. Don´t see the picture as absolute, just made it quickly to explain in both words and picture. The motor won´t be placed as drawn, just put it there to show in which direction it will be placed. I need the to Z20 gears to be powered (by the motor) in opposite direction to each other, that´s why I marked one of the axles red. I don´t like the solution on the picture really, it´ll be to wide when transmission to the Z20 gears is added. If anyone have another solution for angled powertransfer meeting my demands I would greatly appreciate it! Maybe it is doable with a total different set of gears etc. Don´t focus on the parts I´ve used, only remember the function I need.

Hi Is there any way to retract the LA in Lego Digital Designer? Or is it only useable fully extended? Thanks in advance

Very nice truck! Have a question about the rear wheels.. I´m about to build quite a heavy vehicle with the same wheels, but I can´t come up with a good idea how to fasten them in the chassi. I need a really strong fastening solution, are you willing to share how you have attached your rear wheels? The area I´m interested in is where the end of the wishbone mates with the rim. None of the wheels on my build need to be steerable. I have tried some different approaches but everything just bends under load.. Greatful for any help!