[WIP] C4 Corvette

[timslegos]

Okay thank you for the tip about the length. Ball joints is one possibility, though it would be different than the suspension in the real car.

tim

[timslegos]

I have worked some more on the transmission placement as you can see below. Now I am searching for a 4 speed gearbox with reverse that can be easily remote controlled. My search has proved fruitless so far, so please leave any suggestions below.

Here you can see the space i am working with (between the two extended axles).

tim

Edited June 11, 2014 by timslegos

[Alasdair Ryan]

You could try one of Pitterx's ones.

[timslegos]

I guess a linear/sequential gearbox would be the most effective in this situation, are there any other options?

tim

[Alasdair Ryan]

Well I have made a few rotary gearboxes but they take up a lot of room.

[bekesizoltan]

Sheepo is the best in sequential gearboxes. Visit http://www.sheepo.es/.

[Alasdair Ryan]

Sheepo is the best in sequential gearboxes.

Given time anyone can build a gearbox,that includes sequential ones just as good as his.

Any builder who builds a car will more than certain try to put a gearbox in it,overtime as you build more cars your knowledge of lego gearboxes improves.

Edited June 11, 2014 by Alasdair Ryan

[TheItalianBrick]

Sheepo is the best in sequential gearboxes. Visit http://www.sheepo.es/.

well, he is good, sure, but due to the nature of LEGOs his gearboxs are not smooth, neither work afterall. If shifting means to stop the vehicle motion every gear then I wouldn't say it's a win. IMHO But yeah i rekon his gearboxes are pure art in our Lego world.

[tibivi]

Search for 'jaco4 gearbox' on yt and you will find a 4 speed seq gearbox which is really small

I think it may be what you're looking for

Keep up the good work, i want to see this finished

Tibivi

[timslegos]

Thanks for the tip. Unfortunately that gearbox doesnt have a reverse so it is unusable.

tim

[timslegos]

Sorry for the double post but I have built one of Pitterx's Gearboxes. It is a 3 + R gearbox that is relatively small yet strong. Here you can see the rough placement. Now I need a sequential control for the gearbox.

The positions of the gearbox are shown below:

-------front of car-------

first third

reverse second

Please leave any ideas below!

tim

Edited June 18, 2014 by timslegos

[Alasdair Ryan]

Well I guess you could use small steering links connected to pulley wheels on a crank to engage the desired gear.

But really you want the gearbox turned 90 degrees that way you could use a gear rack and get better performance.

[Bzroom]

There are very small gear racks.

[timslegos]

Well I guess you could use small steering links connected to pulley wheels on a crank to engage the desired gear.

But really you want the gearbox turned 90 degrees that way you could use a gear rack and get better performance.

I dont think I understand what you mean.

tim

[Alasdair Ryan]

Piterx uses a 'home made' gear rack which rotates the switching arm to each set of gears.

This one below uses cams....

[cgg199]

Sorry I never got back to you. That gearbox looks far more reliable though, so it'll be best to stick with that.

[timslegos]

Can you tell it is a corvette yet? The red color is only temporary, I will decided the final color when I have most of the body finished. The black connectors mimic the black band that goes around the entire car as a way to separate the upper and lower body panels. Any ideas for how to recess the brake lights? I did my best but I do not like the square hole around the lights. Please leave your suggestions below.

tim

[Lipko]

Maybe you could try not sinking the rear lights so you can circumvent the hole problem.

[Zerobricks]

Can you tell it is a corvette yet? The red color is only temporary, I will decided the final color when I have most of the body finished. The black connectors mimic the black band that goes around the entire car as a way to separate the upper and lower body panels. Any ideas for how to recess the brake lights? I did my best but I do not like the square hole around the lights. Please leave your suggestions below.

tim

Plastic rear end? Yes its a corvette So far so good I'd say.

[Polo-Freak]

Nice A S S

Edited June 28, 2014 by Polo-Freak

[timslegos]

After spending a considerable time I think I finally have developed a proper way to switch gears. The gearbox is still Pitrx's 3 + R, but instead it is mounted upside down. Similar to the old way of making a motorized pneumatic switch, this method relies on the m motor's return to center like property. I am having a slight problem though, the selector on the left does not have enough power to fully switch gears. Please leave your suggestions below!

tim

[piterx]

hey mate, honestly, the setup i made for my first gearbox sucks :P

the one i used in the pajero is way better, smoother and more reliable

this is the way it works, you can also make it smaller

i'd suggest you to make a 3+R as this is an unsynchronized gearbox...the 4th gear is almost impossible to engage :)

[timslegos]

I thought about using a linear gearbox but the added space to change gears seems to be too large. I guess I will revisit it. How would you add a reverse gear?

Tim

[piterx]

this way :)

[timslegos]

It feels good to finally have a rolling chassis. I shopped at the lego store today for the new snowmobile set so I could use the new suspension arms in the front. The front suspension has proper unequal length arms as well as the proper 6 degree caster. I am having some trouble with the steering linkage though. Can anyone explain why there is such an extreme difference in the angle of the wheels? Also credits to Piterx for his very nice linear gearbox.

tim