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My latest 3-D printed experiment

Posted: Wed Dec 18, 2013 11:50 pm
by tebee
I've just done some O9 skips chassis where everything is 3-d printed - including the wheels and axles.

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They run quite well, although not as well as ones with metal wheels and they are VERY light.

The main advantage is it's easy to produce wheels in different styles and size. these ones where done with 20mm axles so these chassis could be used in any gauge between 9mm and 14mm

I've tried this before and had problems with the axle length being made wrongly but this time Shapeways got it right .

This is the wheel in detail - it's in dyed WSF, so nylon and very strong.

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Tom

Posted: Thu Dec 19, 2013 12:37 am
by rue_d_etropal
they look nice, but as you say they are very lightweight. This is one reason many are swapping plastic wheels for metal.
Most railways have wagons off the track, or just sitting at the end of a siding. For these nicely detailed wheels would look great.
Concerned that Shapeways made a mistake though.

Posted: Thu Dec 19, 2013 1:23 am
by tebee
You normally need to add weight to a wagon with metal wheels - it's just you need to add more weight with these.

They are going to get wooden bodies, so I'll stick some lead under these.

Shapeways seem to have a problem with accuracy in the Z axis, which is printed differently to all the rest. This is the one across the striations.

I've had 4 sets of wheels and axles all come out too short by over 2% ( back to back too small too) Normally this would not matter and most people will probably never notice in most things, but in this case it's vital it is correct.

Tom

Posted: Thu Dec 19, 2013 2:25 pm
by Carlo
Tebee -
Why not just print the wheels, and use a metal axle, for weight, accuracy, and mechanical strength? That way gauge would not be an issue.
Carlo

Posted: Thu Dec 19, 2013 3:03 pm
by KEG
Metal wheels or even only an axle does not bring too much weight with these tiny wheels. I sometimes simply wrap a layer or wo of solder around the axles.

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If I donĀ“t have to hide the extra weight, I glue some sheet lead under the wagons.

Have Fun

Juergen