MOCpages : Share your LEGO® creations
LEGO models my own creation MOCpages toys shop W.I.P. Help! Car Transporter
Welcome to the world's greatest LEGO fan community!
Explore cool creations, share your own, and have lots of fun together.  ~  It's all free!
W.I.P. Help! Car Transporter
Hello there. I am building an IR Flatbed truck but I'm stuck. I don't know of the current driving system is going to work in real life. I want to keep it as real as possible even though it is in LDD.
About this creation
First of all some technical specifications:

It is 20 studs wide; 64 studs long; 20 1x1 bricks high

The 2 rear axles are driven by 2 XL motors

The truck is steered by 1 Medium motor

2 Medium motors tilt the flatbet

There are 2 4x11x7 batteryboxes

On the main pictures you guys see how I want to power the axles.

This happens by one XL motor with a short shaft for the front axle, and one XL motor with a long shaft for the rear axle.


Here is my 2nd idea to power the axles: 2 long shafts that each power both axles.

So the two XL engines power the 2 axles.


If this both of the systems shouldn't work in real life; please let me know.

Also if I need to use gears instead; please let me know.

And now comes the tricky part: Do I need to gear down the engines? because I don't want to end up like Ape Fight with some twisted shafts.


Here is a view of my truck. I hope it gives you guys an idea how big the truck is and maybe an idea about the weight.


The flatbed that tilts is colored black.




Here you can see it in action. It can be lifted thanks to the 2 Medium motors.


Side view.

I could really use the help on this one.

Every idea is welcome! Thank you for helping. :)



Comments

 I made it 
  April 2, 2012
Another thanks! Tomorrow I will upload the thing I came up with.
  April 2, 2012
I've never really tried placing mine anywhere but the center. I don't see why it wouldn't work.
  April 2, 2012
Reply: Hey, no you can have the motors powering as many axels as you like : ) The differentials do not need to be in the centre, but make sure the supports and suchlike for axels are symmetrical)
 I made it 
  April 2, 2012
Quoting Senator. Chincilla . You need more bracing, man! =P And don't use knobs gears, use the ones with the beveled edge for a more even power transfer. You should use those technic bricks and make sure they are right up behind the gears, otherwise the axle will just bend. http://www.bricktrucktrial.com/rubrique.php3?id_rubrique=9 This site has loads of info for Trial trucks, but the ideas can be used for anything, really. Good luck!
Thanks for the tip and the site comes in handy too. Just one more question: when I place the differential does it need to be in the center of the axle?
  April 2, 2012
You need more bracing, man! =P And don't use knobs gears, use the ones with the beveled edge for a more even power transfer. You should use those technic bricks and make sure they are right up behind the gears, otherwise the axle will just bend. http://www.bricktrucktrial.com/rubrique.php3?id_rubrique=9 This site has loads of info for Trial trucks, but the ideas can be used for anything, really. Good luck!
 I made it 
  April 2, 2012
Quoting Mathieu Pedneault You must have to use differential in 5x11 frame for rear. You can connect rear axel between them. And use gear to down motor speed and connect the motor one with the other. i can look tonight for a fast 3d model for explanation.
Thanks for the help. It would be nice to have a model for explanation because I know absolutly nothing about differentials but I am also searching the web for more information.
 I made it 
  April 2, 2012
Quoting Ape Fight Looks ambitious! : ) I can see the axels crossing at the moment but I presume you'll fix this for the real thing? To corner properly you'll need two differentials, one on each axel. You can get away without having them but sharp turns will be a struggle. As for gearing down, weirdly I geared mine down too much and twisted the axels as I was afraid of putting too much strain on the motors. I didn't realise how powerful the XLs are. But- I'd rather bust axels than expensive motors so it's better to be safe. By having two driveshafts as you do in the picture you'll halve the pressure on them (good), but it does mean twice the friction (bad). Good luck!
1. Thanks for the help. 2. Lets see if I get it: I need 1 diffferential on each axle. And 1 XL-motor can power only 1 axle? I'm really getting confused.
  April 2, 2012
Looks ambitious! : ) I can see the axels crossing at the moment but I presume you'll fix this for the real thing? To corner properly you'll need two differentials, one on each axel. You can get away without having them but sharp turns will be a struggle. As for gearing down, weirdly I geared mine down too much and twisted the axels as I was afraid of putting too much strain on the motors. I didn't realise how powerful the XLs are. But- I'd rather bust axels than expensive motors so it's better to be safe. By having two driveshafts as you do in the picture you'll halve the pressure on them (good), but it does mean twice the friction (bad). Good luck!
  April 2, 2012
You must have to use differential in 5x11 frame for rear. You can connect rear axel between them. And use gear to down motor speed and connect the motor one with the other. i can look tonight for a fast 3d model for explanation.
 
By brick ster
Add to my favorite builders


1,186 visitors
9 comments
Added April 2, 2012
 

The background images used on this page are © Todd Lehman,
available at http://www.lugnet.com/fibblesnork/lego/backgrounds/


LEGO models my own creation MOCpages toys shop W.I.P. Help! Car Transporter


You Your home page | LEGO creations | Favorite builders
Activity Activity | Comments | Creations
Explore Explore | Recent | Groups
MOCpages is an unofficial, fan-created website. LEGO® and the brick configuration are property of The LEGO Group, which does not sponsor, own, or endorse this site.
©2002-2014 Sean Kenney Design Inc | Privacy policy | Terms of use