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HO scale Dry Bulk trailer. [message #59580] Thu, 03 January 2013 22:12 UTC Go to next message
avatar SteveS3D  is currently offline SteveS3D
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Registered: January 2013
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New guy here. Although I've been playing around with 3D modeling since the mid '90s and I've been aware of 3D printing for a few years now, this is the first model that I've bothered to print out.

This is an HO scale (1:87) dry bulk trailer that I'm about to have printed. When I first uploaded the model, the price was pretty steep, so I did everything I could to minimize the cost. I hollowed out the tires, rebuilt the tank with thinner walls (from 2mm to 1.3mm.) And I packed all the parts as close as possible to reduce the amount of sprue needed. I managed to cut the volume down from 22.2 cm3 to 17.6cm3.

One thing I'm wondering about is whether Frosted Detail will be good enough, or will it require FUD. Since I'm going to be offering it for sale, I want to be able to let people know if FD is no good, so I think I'll order it in that material. But before I do, I thought I'd check here and see if people with experience with FD could give some input. The overall length of the trailer is 15cm. The piping that runs under the trailer is 2 mm thick. The handrails are 1mm.

http://i1089.photobucket.com/albums/i347/Steven_A_S/bulk5_zps0d7127ac.jpg

http://i1089.photobucket.com/albums/i347/Steven_A_S/bulk4.jpg

Steve S
Re: HO scale Dry Bulk trailer. [message #59586 is a reply to message #59580 ] Thu, 03 January 2013 23:25 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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For FD, the minimum wall can be as low as 0.5mm and for FUD, it can be as low as 0.3mm. If you are at 1.3mm, I would take a serious look at thinning the walls down - in theory, you could drop half the volume or more.

It's simple or straightforward as "cut it in half", because you do have to worry about material stresses, but many surfaces around your model can likely be thinner.


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: HO scale Dry Bulk trailer. [message #59587 is a reply to message #59586 ] Thu, 03 January 2013 23:37 UTC Go to previous messageGo to next message
avatar SteveS3D  is currently offline SteveS3D
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Registered: January 2013
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Thanks for the response. My main concern was strength. I was aware of the minimum thicknesses, but thought that was for fairly small areas. For something as large as the tank (about 4" long) I was concerned it might warp. It may have to withstand some sanding.

Steve S
Re: HO scale Dry Bulk trailer. [message #59752 is a reply to message #59587 ] Mon, 07 January 2013 10:05 UTC Go to previous messageGo to next message
avatar Dragoman  is currently offline Dragoman
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You could thin down the walls to the minimum, but leave some reinforcing ribs on the inside. This should be good enough. Also, have a good look at the material desing rules, The FUD ones are especially detailed. But in the end, there is nothing like experience. Get it printed and see if it works out. OK, not that cheap with FD / FUD.

Something else: don't forget the escape holes for the support material. I don't see any holes in you model's tanks.

Greetings
Dragoman

[Updated on: Mon, 07 January 2013 10:05 UTC]

Re: HO scale Dry Bulk trailer. [message #60081 is a reply to message #59752 ] Sat, 12 January 2013 16:16 UTC Go to previous messageGo to next message
avatar SteveS3D  is currently offline SteveS3D
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Registered: January 2013
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Dragoman wrote on Mon, 07 January 2013 10:05


Something else: don't forget the escape holes for the support material. I don't see any holes in you model's tanks.

Greetings
Dragoman



The first pic shows that the tank is divided into two halves. The second pic just shows what the finished model will look like.

Steve S.
Re: HO scale Dry Bulk trailer. [message #60093 is a reply to message #60081 ] Sat, 12 January 2013 18:55 UTC Go to previous message
avatar Mhagan  is currently offline Mhagan
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Registered: November 2012
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Also make sure you look at the minimum wire thickness on the design guidelines for FUD (0.6mm). The ladder on the back looks quite thin. Smile

I agree with some of the other members, The walls of the tank could be thinned down a bit. In my experience 0.8-1.0 mm in a curved shape strikes a nice balance between Cost and Fragility. Of course Thicker walls would be needed if this will be handled regularly.


3D Printing Engineer | Shapeways

 
   
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