Author Topic: A gearbox for a little locomotive  (Read 5906 times)

Offline Zephyrin

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Re: A gearbox for a little locomotive
« Reply #30 on: November 04, 2022, 06:36:09 PM »

And now the engine...always my favorite point in model, even if I choosed this model owing to the gearbox !

the  plan of the engine is extracted from the same original picture, lot of infos, but really confused (the first picture of the thread)
it is a small 4 stroke engine with 12mm x 20mm bore & stroke, i.e. 2.2cm3, with spark ignition (coil and contact breaker) and carburetor.
the original engine had a magneto and a pump intake, (if I understood correctly), but I gave up the fuel pump at this scale.

the machining from bar stock is fairly conventional since I don't have any good aluminium castings with my 3D models...

<a href="https://www.youtube.com/watch?v=TtRIWxtQ6IQ" target="_blank">http://www.youtube.com/watch?v=TtRIWxtQ6IQ</a>



Offline Admiral_dk

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Re: A gearbox for a little locomotive
« Reply #31 on: November 04, 2022, 07:43:35 PM »
Looks really old fashioned - and one German caption mentions that is was originally a Mine-Shunter - so do you plan to run it under ground  ;D

No matter - I really like the Looks and Apperance  :Love:   :cheers:

Per

Offline Roger B

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Re: A gearbox for a little locomotive
« Reply #32 on: November 04, 2022, 07:54:07 PM »
Excellent  :praise2: The crank and camshaft look to run freely. I have done fuel injection down to 6 cm3 cylinders however 2.2 cm3 is another challenge. The pump would need to be 1.5mm bore and the injector needle 1mm  :headscratch:  :thinking:  ::)
Best regards

Roger

Offline Zephyrin

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Re: A gearbox for a little locomotive
« Reply #33 on: November 05, 2022, 07:37:47 AM »
You are right, Per, this shunter is pretty ugly, but not so ugly that she has to be hidden underground!
I chose her only for the engine and the transmission; and most of the pictures I gathered show the loco without the bonnet, fortunately !


Roger, with all that I learned by following all your experiments, testing a fuel injection system was my intention at the beginning of the project, this engine dates from right before the diesel and was a good model to have a go...
 But I had to leave this project this summer, and since I have lost its ambition and direction, and now, I'm trying simply to finish this small engine to the simplest and wishes that my model run like this stationary version of this 1905 Deutz engine.

<a href="https://www.youtube.com/watch?v=0-nAtXU8AO4" target="_blank">http://www.youtube.com/watch?v=0-nAtXU8AO4</a>





Offline Admiral_dk

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Re: A gearbox for a little locomotive
« Reply #34 on: November 05, 2022, 06:14:29 PM »
I don't know about 'Hidding it Underground' .... as much as the fact, that it was presumeably meant to do almost all it's work underground -> not much point in 'Prettying it up' ....

I don't know how important it is to you, to make your models authentic - but if not (and you have a succesful roling chassis, w. Engine) - you could always put a more 'Atractive Top' over it  ;)

No matter what - I find your project very interesting  :cheers:

Per

Offline Roger B

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Re: A gearbox for a little locomotive
« Reply #35 on: November 07, 2022, 09:52:26 AM »
I'm happy that you were thinking about trying a fuel injection system  :) however life dosen't always go the way we want  ::)

I look forward to seeing it running along the track  :ThumbsUp:  :wine1:
Best regards

Roger

Offline Zephyrin

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Re: A gearbox for a little locomotive
« Reply #36 on: November 11, 2022, 09:37:43 AM »
Thanks for your interest folks, a much appreciated nudge !

Here is the progress of the model, at this stage I still have the most difficult part to do; the cylinder head with the valves, the rocker arms and the cams...and then to make the engine alive!
I don't get tired of looking at all these little gears, in fact it's mostly for that reason that I'm making this model!

<a href="https://www.youtube.com/watch?v=n3JMKeJZ750" target="_blank">http://www.youtube.com/watch?v=n3JMKeJZ750</a>

Offline Johnmcc69

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Re: A gearbox for a little locomotive
« Reply #37 on: November 11, 2022, 07:11:04 PM »
 :ThumbsUp:
 That really is some GREAT work. You're right about the gears, it's poetry in motion. I feel like a cat chasing a laser pointer when I see all those motions.  :Love:

 John

 

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