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A new drive unit for my 0-4-0 'Therese'
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 Posted: Fri Feb 13th, 2009 11:56 am
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Toeffelholm
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Hi,

I have created a new drive for my 0-4-0 Loco "Therese" and I thought you guys may be interested to see the first pictures.



The drive is made of laser cut steel parts. I have designed them in CAD and have given the drawing-file to Harald Brosch, who has good contacts to some laser cutting undertakings and who is busy in doing various laser cut model railway parts as e.g. coaches and Fremo-Modules.

The parts have noses and notches so that you can plug them together to a rigid small chest. The drive has ball bearings for the axles and a teeter-totter for the second axle, so that the drive gets a 3-point bearing.

The Motor is a coreless low geared motor from Maxon. The angular gear to the axle is realized with a 45° helical gearing mechanism.







The force transmission to the the second axle will be done prototypically by using the coupling rod, what will work without any jamming I hope.

to be continued..

Juergen

Last edited on Tue Apr 6th, 2010 07:40 pm by Toeffelholm



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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Fri Feb 13th, 2009 10:58 pm
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Herb Kephart
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Juergen

That is my kind of mechanism!!!
I would probably use brass, and mill the pieces, but what you have done is first class!
Where did you get the helical gears?



Herb:old dude:



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 Posted: Sat Feb 14th, 2009 09:13 am
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Toeffelholm
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Thank's Herb.

It is the development and test phase. Steel and the laser cutting was the easiest choice for me for the first.

Laser cutting brass is difficult and would be much more cost intensive, because you need a special laser machine.

Milling would be an alternativ. But because of the round milling cutter I couldn't get exactly sharp 90° inner corners, I think, even if a very thin cutter is used. The advantage would surely be that brass can be soldered.
The steel parts will be fixed with some pins in predrilled holes at a few points.

For the first I wanted to see if my Idea works and up to this stadium it does. As already said, the next will be to apply a new coupling rod with real force transmission, a friend will mill for me.

If everything works fine, I want to try to making the whole think much smaller, that I can used it for Gn15 locos on 16,5mm track. RC controlled for sure! As I am using a 2,4Ghz stick transmitter now, I have the great advantage that I can use an esc for brushless motors and thus a brushless motor, that makes me able to chose a very small but powerful motor unit.

My source for gears is

http://www.modellbauershop.de/assets/s2dmain.html?http://www.modellbauershop.de/index2.html

The helical gears you find under "Schraubenraeder" (I use brass)


Juergen

Last edited on Sat Feb 14th, 2009 10:53 am by Toeffelholm



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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Sat Feb 14th, 2009 12:32 pm
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Sullivan
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That's some really masterful work! I really like the idea of the "teeter-totter" for three point suspension.

Keep us posted.



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 Posted: Sat Feb 14th, 2009 02:50 pm
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Herb Kephart
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Thanks for the gear source, Juergen.

I didn't mean to imply that my way of working was better, just that I have brass and milling machines, and I would have to find and pay for laser cutting.

Please keep us informed of your progress!


Herb:old dude:



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 Posted: Sat Feb 14th, 2009 06:01 pm
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Toeffelholm
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Herb, no problem!
I already understood what you meant.

Sullivan,
thank you very much for comment. But it's really not that difficult doing something like that. You make use of modern prodution techniques and have only to deliver the Idea and the drawing. (A freeware CAD programm is eg. A9CAD)


Juergen



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Actual project: 7/8" scale on 45 mm track
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 Posted: Tue Apr 6th, 2010 08:13 pm
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Toeffelholm
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Hi,
after long time, I have found time to make some progress on Therese.

The coupling rod, has been milled and fitted by a friend.
Now the prototypical force transmission to the second axle works fine without any jamming, also with lowest speed.



I have also drawn new chassis parts


These will be milled next days I hope, so that I can finitely bring Therese into service again.

Juergen

Last edited on Wed Apr 7th, 2010 05:17 pm by Toeffelholm



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Actual project: 7/8" scale on 45 mm track
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 Posted: Wed Apr 7th, 2010 01:43 pm
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W C Greene
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Juergen-that is wonderful, and I mean it! I can't wait to see the loco up and running, she will be a beauty. The equalized suspension will enable the loco to crawl over some truly awful trackwork-please send her to me for trials on the Mogollon Railway....

                        Woodie



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 Posted: Wed Apr 7th, 2010 03:03 pm
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Sullivan
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That is one spiffy drawrod - just beautiful.

Love the drawings you've done for the chasis. It ought to turn into a really nice loco.



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 Posted: Wed Apr 7th, 2010 03:30 pm
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teetrix
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Juergen,

the chassis is already a fine piece of work, but this coupling rod is the icing on the cake! :thumb::thumb::thumb:
How do you want to make the rivets?

Michael

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