Lego 112 - Decauville variant

[Paperinik77pk]

Hi all, since in these days I'm working on the 112 XXL , I thought it could be an idea to have the old glorious 112 also in a smaller scale.

So I began to design this little thing around the 9V Micromotor:

The front and top part are really similar to the 112 version inside the "50 years on track" set. In my opinion that version is very well done, but has some strange solutions (like the cabin glass going on the top of the boiler). Even this one has the boiler setting higher than it should be, but the big gear required a bit of room.

 

Being so narrow and tall, it immediately resembled me a Decauville steamer, so I decided to go all the way and I adapted the buffers/couplers accordingly.

This is the internal mechanism with the fake 9V Micromotor.

The locomotive can be driven from an external battery box, but inside the boiler there's the possibility to accomodate three CR2025 batteries for a short, independent journey. I did not try a 9v battery box since in blue it is very rare stuff (plus, experimening a bit with alternative batteries will be useful also for my other models based on the 9V Micromotor (like the Badoni "Sogliola", for example).

The locomotive is FWD only, since I needed some chassis to support the whole thing

The size is quite right for a standard Lego Minifig.

I can't wait to see the big one, the original and the small sister all together!

Ciao!

Davide

 

[Toastie]

Davide, this is very nicely done! The very moment one sees it, 4.5V with 3 digit set numbers comes warmly to mind.

One Question: The micro motor does not have that much torque. It spins rather slowly so that is perfect. As you are not gearing down even further: Did you try it? I am sorry, I must have missed the Badoni "Sogliola" model of yours.

Best
Thorsten

[LEGO Train 12 Volts]

From a large model to a 4 wide ..very poliedric!

I like the skillful way you've squeeze the motor inside the locomotive

[Paperinik77pk]

On 7/26/2019 at 10:18 PM, Toastie said:

Davide, this is very nicely done! The very moment one sees it, 4.5V with 3 digit set numbers comes warmly to mind.

One Question: The micro motor does not have that much torque. It spins rather slowly so that is perfect. As you are not gearing down even further: Did you try it? I am sorry, I must have missed the Badoni "Sogliola" model of yours.

Best
Thorsten

Ciao Thorsten! Thank you!

The Micro Motor is quite good for this kind of applications - the problem is its high price. I have two of them and I use them from time to time. I usually keep the direct drive 1:1 gear ratio (the train wheels overdrive the final gear ratio a bit).

On the Badoni "Sogliola" (Breuer Type IV) I used old Technic wheels with slick tires from the 70s, and the gear ratio is a bit lower than using train wheels (due to the bigger diameter).

 It pulls two 12v cars from a a 7740 without problems. It is slow, but the speed matches the real thing and is correct for the shunting work.

This is the other Moc using the 9v MicroMotor - it is a bit slower than the Badoni.

I'm wondering if a more powerful small motor can be squeezed inside a modified brick (or a specific 3d printed case with studs). It's nice to create small things! 

[Paperinik77pk]

On 7/26/2019 at 10:53 PM, LEGO Train 12 Volts said:

From a large model to a 4 wide ..very poliedric!

I like the skillful way you've squeeze the motor inside the locomotive

Thanks Emanuele!!! That motor has a lot of potential...Pity it is so rare!

[LEGO Train 12 Volts]

6 hours ago, Paperinik77pk said:

Pity it is so rare!

....and so expensive! 

[Toastie]

I have one ... it turns the "head" of an R2D2 ... well, I believe this is going to change.

Thanks for the links! They are very helpful.

And just because both of you Italians are "here": All the best for you Davide and Emanuele!

Have a very nice evening,
Thorsten

[LEGO Train 12 Volts]

You're to kind @Toastie ...as always!

Have a nice evening you too (I've just read about the rank ...great point of view from you )

[Paperinik77pk]

14 hours ago, Toastie said:

I have one ... it turns the "head" of an R2D2 ... well, I believe this is going to change.

Thanks for the links! They are very helpful.

And just because both of you Italians are "here": All the best for you Davide and Emanuele!

Have a very nice evening,
Thorsten

Thanks Thorsten!!! All the best to you too!

Edited July 31, 2019 by Paperinik77pk

[Laura Beinbrech]

Nicely done!  I gotta admit that I have a bit of a soft spot for the 600mm Decauville railroad system ever since I first found out about it while reading up on WWI trench railways a few years back.  I especially have to give you props for not only designing a powered 4-stud LEGO narrow gauge train, but one of the smaller Plymouth/Köf type narrow gauge locomotives (as opposed to say, one of the larger types of narrow gauge locomotives such as one of the East Broad Top RR 2-8-2 Mikado steam locomotives or one of the fairly common narrow-gauge variants on 45-65 ton GE center-cab diesels).  This thing is truly a marvel of compact engineering & miniaturization!