The set up allows for 4wd, clearly it has no steering at the moment, but that is beside the point

If I'm right the gearing has been up-rated, but thats because I only have 1 of the larger gears, which wont be a problem when its converted to 2wd for the working model.

This is my first step in to MOCing and would appreciate confirmation I did it correctly lol

Well there is no wrong way to MOC!

It is a very nice start and we cant wait to see more.

tim

hi,

Here are some tips:

Have the axle supports up against the gear to avoid having 'play' in the axle and therefore is not as good for traction.

Put the motor in a place where its weight is more evenly distributed.

Other that that, good start.

To answer your question,yes you have geared it up.

To answer your question,yes you have geared it up.

That explains why is shot across the living room floor and straight in to the door when I let it go haha

I'm gonna have a look for a system that allows steering of the front wheels - possible return to centre if I have the parts/technical ability to - not sure if I can keep it as 4WD though lol

I also want to try and add some sort of suspension system at some point, but that might have to wait until I have more parts/sets

Here is a quick cad of a homemade stearing axle.

It should be easy to attach a gear rack to that,for suspension swivel ' like on tractors' would be the easiest but you could swivel on each side 'like a car'.

Edited January 8, 201213 yr by Alasdair Ryan

Something like this?

Its larger than your model as I dont have the smaller "twisting link" thingy, tomorrow I will have a 2nd one when the postman turns up as I got a complete 8854 set nice and cheap.

All I need to do now is work out how to attach that to the model and giving some steering lol

Yeb just like that,I think you could make a smaller design.

Edited January 8, 201213 yr by Alasdair Ryan

Can someone point me to some how to designs for steering racks?

@ Smyrgol: You can study the four pictures on this webpage for a simple, return-to-center steering design that uses rubber bands (instead of the rare "hockey spring" part).

Some ideas for some stearing racks for you sir.

For unconventional steering, consider Legoism's "Self-Steering Car Chassis, Mk II". There is a great explanation of it on that webpage and this

, but here is a summary:

"Each of the rear wheels' axles (A) is linked to a differential several studs ahead (B). As you have perhaps noticed, there are three gears © on one, and four at the other side, resulting in one of the axles spinning in reverse. The differential thus works opposite from its typical application on the half-axle; it actually turns only when the rear wheels aren't turning at the same speeds (i.e. they tend to steer), and its rotation speed is proportional to the difference between the rear wheels' speeds. But as long as the rear wheels turn simultaneously, it remains stationary."

That is a pretty cool steering design. Although it might be somewhat impractical to implement because of its large size.

tim

This doesn't use rare parts, and has instructions:

This is mine:

Compact 4WD:

If you wanted, this would fit a 3L differential:

Self centering steering in real vehicles is created by a combination of toe in and caster. Does anyone use or tried these techniques in their MOC's to any effect?

cheers

Surly

That is a pretty cool steering design. Although it might be somewhat impractical to implement because of its large size.

tim

Agree. A smaller alternative is to replace the front differential with a light clutch (probably using a sufficiently slack rubber band), though that would be more difficult to adjust precisely.

Oha, what is this? I never saw a IR Controller like the shown one in picture number 3. Great Solution, reminds me to carrera.

Self centering steering in real vehicles is created by a combination of toe in and caster. Does anyone use or tried these techniques in their MOC's to any effect?

Hi Surly. You might be interested in Sheepo's Porsche 911 (997) Turbo Cabriolet PDK. His MOC features a camber angle of about 2 degrees at the front, Ackermann steering, and a caster angle of about 3.36 degrees, among many other features.

See the Eurobricks post and Sheepo's Garage for more information. This MOC also won the 2011 AFOL Lego Technic Challenge [link].

Edited April 10, 201311 yr by Splat

This is as far as this particular design is going:

There is absolutely no design what so ever for the end result, purely a test piece to work to work out how to do things

I am really sorry but i can't stop laughing just looking at that front wheel setup.

That is certainly a very original idea for front suspension.

tim

When I found the shock absorbers in the box from ebay I just couldnt help myself. I must admit that it is an extremely weak point and the rear suspension over the drive wheels doesnt actually do anything at all - the suspension runs up to the red bars covering the battery box and that links back to the same rigid frame the bottom of the absorbers is connected too haha.

The steering just about works, but tends to skip a lot, which I think is due to the ridiculous design of my suspension haha

Hi Surly. You might be interested in Sheepo's Porsche 911 (997) Turbo Cabriolet PDK. His MOC features a camber angle of about 2 degrees at the front, Ackermann steering, and a caster angle of about 3.36 degrees, among many other features.

I have spent a lot of time on Sheepo's site looking at his awesome creations.

I wonder if his 911 self centres when driven as a result of the caster?

cheers

Surly

When I found the shock absorbers in the box from ebay I just couldnt help myself. I must admit that it is an extremely weak point and the rear suspension over the drive wheels doesnt actually do anything at all - the suspension runs up to the red bars covering the battery box and that links back to the same rigid frame the bottom of the absorbers is connected too haha.

The steering just about works, but tends to skip a lot, which I think is due to the ridiculous design of my suspension haha

I think that your creation is turning into a piece of art lol I've never seen anything like it

That is the absolute maddest front axle setup I have ever seen! It looks the 4L axle between the U-joints should be replaced by a 3L though.

Edited January 11, 201213 yr by Pauger