[TC17] The Tracked Trike

[vascolp]

 

Entry Name: TTT - The Tracked Trike

Mr Obi's mighty machine gun tracked trike, or... TTT - The Tracked Trike!
A big machine gun is always useful in the Wastelands. And a mobile one even more!
 

Hello everybody, this is my entry for the [TC17] contest.

This is a tracked trike with a big machine gun on top of it. The machine gun has 4 barrels that are moved forward and backward by an orange rotary selector.
As a bonus, the barrels also rotate themselfs doing a lot of noise :-)

RC Features (two PF IR Receivers):

1. Driven by two L motors 4
2.  speed @Didumos69 simple 4 speed based gearbox, modified to use a torsion bar for the 90 degree delimiter and an embbebed 4th to 1st blocking mechanism.
3. Servo for speed change using a @charbel 90 degree stepper
4. Servo for steering
5. Secondary distribution gearbox, with 4 exits, commanded by the same shaft used to command the speed gearbox, driven by an M motor.
6. 1st speed: Tracks enlarge for stability
7. 2nd speed: tilting machine gun
8. 3rd speed: rotating machine gun
9. 4th speed: firing machine gun

Other functions:

1. Tracks with a suspension
2. Tracks always under tension, front sprockets shares shock absorbers with first boogy
3. Foldable chair on the machine gun

 

 

 

And some (lousy and unedited) videos...

The Tracked Trike, my entry for the eurobricks.com [TC17] contest.

TTT moving around:

 

TTT Firing:

 

TTT suspension and tracks:

 

 

TTT All functions while in a stand:

 

 

TTT Steering:

 

I hope you enjoy it.
 

Edited August 25, 2020 by vascolp
Fixed broken picture link

[vascolp]

More pictures in https://www.bricksafe.com/pages/vascolp/202002ttt.

Edited January 4 by vascolp

[LegoTT]

"commanded  by the same shaft used to command the speed gearbox"

I don't understand that. Do you mean you use the same lever on the IR command ?

[vascolp]

3 hours ago, LegoTT said:

"commanded  by the same shaft used to command the speed gearbox"

I don't understand that. Do you mean you use the same lever on the IR command ?

Yes. 

The axle used to switch the speed on the transmission gearbox also changes the position of the distribution gearbox.

 

[LegoTT]

How do you choose if you want operate one gearbox or the another one ?

[vascolp]

3 hours ago, LegoTT said:

How do you choose if you want operate one gearbox or the another one ?

Well, you don't choose. They are always both operated. The idea is that you either drive or are playing with the other functions, but you are not doing both at the same time. This reduces the number of IRs and motors needed.

And even more, you reduce the number of mechanisms needed, the 90 degree step mechanism is shared by both gearboxes.

Anyway, if you are in 4th gear I suppose you can be driving and firing at the same time, for instance... I never tried, that might be cool!?

Edited February 28, 2020 by vascolp
More detail

[Gray Gear]

Impressive you could squeeze all these functions in such a small package But not being able to shoot and aim at the same time kinda sucks 

[vascolp]

9 hours ago, Gray Gear said:

Impressive you could squeeze all these functions in such a small package But not being able to shoot and aim at the same time kinda sucks 

Can´t have it all

I had several versions of it. A motor directly connected to the barrels (problems with the wires... and no tilting or rotation), then a motor on the bottom part that would rotate the barrels and tilt the machine gun up and down when turning in one direction and rotate it when turning in the other direction...

Then I came up with the ideia of having all the three degrees of freedom in the machine gun using the four states of the gearbox... and there was even space for one more function... spreading tracks...