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I'm thinking about a 3D printing...
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 Posted: Sat Jul 2nd, 2016 11:48 am
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Annie W
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tebee wrote:
Here is a little example of a 3d printed Gn15 wagon from Shapeways compared to a simplified version printed on a home printer




Tom


I have some of Tom's 3D printed models, both Shapeways printed ones as well as simplified versions from his own home printer and I have to say that I'm a big fan of 3D printing. Due to this illness I live with I can no longer scratchbuild in the smaller scales and it is 3D printing that gives me hope for the future and a way to stay in the hobby. I have plans to obtain my own printer later this year which should enable me to make a return to smaller scale modelling.



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 Posted: Sun Jul 3rd, 2016 02:04 am
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dwyaneward
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Interesting thread guys, as mention already. If your modeling something not available 3D pritning is a very good option.

My example, I have started modeling in TT scale(1:120). I needed some Bettendorf trucks for some 3D printed hopper cars I purchase.

Made a design in AutoCAD



Had Shapeways print them









It took two printings to get trucks that the axle fit properly.  As I did not understand the clearance I needed for the axles.  



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Dwyane Ward | Fairview, TX
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Texas & Pacific - Bonham Division in N Scale
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KD Models - 3D printing
https://www.shapeways.com/shops/kdmodels
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 Posted: Sun Jul 3rd, 2016 08:39 pm
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Alwin
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Hi Dwyane,

Those trucks look good. How did the springs come out? And how do they roll?

Alwin

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 Posted: Mon Jul 4th, 2016 01:18 am
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bobquincy
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I have been sending files to Shapeways for years, their "SWF" (sintered nylon) keeps getting better to where I now can have pulleys made that are concentric enough to use for drive systems.
I model in ProEngineer since that is what I learned at work, back when I worked  ;)  Here is a belt drive chassis with most of the parts printed:

Last edited on Mon Jul 4th, 2016 01:19 am by bobquincy



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 Posted: Mon Jul 4th, 2016 11:15 am
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Annie W
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Some folk don't like WSF, but I do. FUD is too expensive and fragile to make working models from.

Nice belt drive chassis Bob. Is that for a monorail?



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 Posted: Mon Jul 4th, 2016 01:29 pm
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dwyaneward
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Alwin wrote: Hi Dwyane,

Those trucks look good. How did the springs come out? And how do they roll?

Alwin
Alwin,

This is the best photo I could get of the springs



If it looks good arm length I am happy.

The truck do not roll freely direct from Shapeways, the axles have a slight tight fit, but will roll with some pressure applied to truck. Another fellow TT'er has used an abrasive paste to polish out the journal to get a free rolling truck.



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Dwyane Ward | Fairview, TX
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Texas & Pacific - Bonham Division in N Scale
http://kdrail.blogspot.com/
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KD Models - 3D printing
https://www.shapeways.com/shops/kdmodels
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 Posted: Mon Jul 4th, 2016 01:57 pm
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bobquincy
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Annie W wrote: Some folk don't like WSF, but I do. FUD is too expensive and fragile to make working models from.

Nice belt drive chassis Bob. Is that for a monorail?

You guessed it!  This is a (mostly) drop-in replacement for Disney's gearbox, providing a smooth, quiet, and fast (about 2x) drive system.

boB



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 Posted: Mon Jul 4th, 2016 02:30 pm
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Herb Kephart
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Bob

What are you using for belts?

Don't look ''fat'' enough to be O rings.

And the nearest to the camera large pulley seems to have a joint in the belt.


Herb



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 Posted: Mon Jul 4th, 2016 02:42 pm
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bobquincy
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Herb Kephart wrote: Bob

What are you using for belts?

Don't look ''fat'' enough to be O rings.

And the nearest to the camera large pulley seems to have a joint in the belt.


Herb
After some testing I settled on 1.5 mm o-ring "belts", they are not so stiff as to cause excessive drag and can transmit enough power.  The motor can take more than 2 watts (2xAA NiMH at 800 mA) running the monorail.  I haven't checked stall but the design lets the twin belts slip before the motor stalls, it's still probably over 1.5 A.

It only looks like a joint because of the angle, those are 1.5x24 o-rings.  1 mm o-rings are available for lower power applications and for the really small stuff Nigel Lawton's belt drives are the way to go.

I learned a lot about belts and pulleys while designing this!  :)  Here it is installed in the lower monorail shell: 


boB

Last edited on Mon Jul 4th, 2016 02:45 pm by bobquincy



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 Posted: Mon Jul 4th, 2016 04:11 pm
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bobquincy
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For those who don't have a 3D printer and are not ready to buy one, there is a local alternative to Shapeways.  3Dhubs lines up local people who have printers with those who want prints.  I found someone about a mile away who was willing to print my chassis for about $8 and have it ready the next day.

Unfortunately my design was not suitable for extrusion printing and it was easier to send it to Shapeways than to change the design but for other prints I will try 3Dhubs again.



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