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  • Topic: Brian Briggs' PS Mini-Hy Cube boxcar

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    • October 24, 2017 7:05 PM EDT
      • Sparta, TN
         
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      A little closer to having all the parts worked out for the underframe:

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    • October 26, 2017 8:36 AM EDT
      • Sparta, TN
         
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      My inexperience in F360, coming to light, I ended up redrawing the end from scratch.   Watching their tutorials, they put an emphasis on making everything components. 
       
      When I started cutting the mounting holes for the ladders, I realized making each rib a component was not going to work.  Making a hole in one, resulted in a hole in every rib. 
       
      When it was time to scale it down to 1:29, I also encountered odd behavior in how it handled what they call “patterns”.  Where I had distributed rivets every 2 inches, it maintained the 2 inch spacing after the scale operation.
       
      Redrawing it also allowed me to correct something I missed the first time.  The ribs are not completely straight, but slope gently from the middle to the end.
       



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    • October 28, 2017 8:15 AM EDT
      • Sparta, TN
         
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      Got everything broken down & arranged for a Shapeways order.

      I'm taking a different approach on the ladders this time.

      In the past, I have had them 3d printed in SLS nylon. The texture was a little rough that way, but I could live with it. However, Shapeways has a habit of revising their printing guidelines. I guess they’re still going through growing pains. I have sometimes found things I printed 6 months ago, they say are no longer printable. Occasionally, things have also arrived broken (I assume they were handled too rough during cleaning).

      This time around, I’m going to try making the ladders in brass. I’ll use the acrylic prints (below) to make a mold for waxes. These waxes will be sent off for investment casting. The rungs (with NBW) will be one piece, and the rails will be a separate piece. I made them with locating pins to make assembly easier. I will find out in a few weeks if this is a better approach.




      These parts will be used as patterns for resin casting:


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    • October 28, 2017 3:01 PM EDT
      • Missouri
         
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      Burl Rice said: Where I had distributed rivets every 2 inches, it maintained the 2 inch spacing after the scale operation.




      Now that is weird.

    • October 28, 2017 4:24 PM EDT
      • Martinez, California
         
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      That’s what I was wondering, too. Any idea how or why it happened and how to avoid it? Still learning the program ...

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    • October 28, 2017 7:33 PM EDT
      • Sparta, TN
         
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      Trial and error?   Just one of the quirks of software. 

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    • October 28, 2017 9:09 PM EDT
      • Pittsburgh, Pennsylvania
         
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      Gregory Hile said:

      That’s what I was wondering, too. Any idea how or why it happened and how to avoid it? Still learning the program ...

      On some image editing software, spacing of the grid remains constant even when the image gets resized, unless the image is flattened and all the "layers" are compressed into one layer. Then the grid resizes with the image. Maybe something similar is going on there. Different layers, and you only re-scaled one of the layers. Just a thought.

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      Shannon car Shops
      Home of the infamous leg lamp

      I.A.R.R.R. Member #12

      and King Butt Modeler

    • November 1, 2017 5:35 PM EDT
      • Sparta, TN
         
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      Laser cut parts came in today.  I had these made at http://ponoko.com/
      Kind of like Shapeways, but for laser cutting.  I have not taken the paper off yet.

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    • November 1, 2017 6:33 PM EDT
      • Port Orchard, Washington
         
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      What products are they able to laser? I didn't see a listing of material available. 

      I'm guessing you used acrylic?

    • November 1, 2017 7:10 PM EDT
      • Sparta, TN
         
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      They do your basic acrylic, cardboard, some plastics.  They also offer photo etching, but their prices seem high on that.  I think you have to create an account before you can browse materials.

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    • November 1, 2017 8:09 PM EDT
      • Pittsburgh, Pennsylvania
         
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      Oh no! So instead of begging Dave Bodner, I can have stuff lased elsewhere? I better not let the design team see this thread.

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      Shannon car Shops
      Home of the infamous leg lamp

      I.A.R.R.R. Member #12

      and King Butt Modeler

    • November 1, 2017 9:03 PM EDT
      • Port Orchard, Washington
         
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      As we have discussed before, finding reasonable photo etching services are hard to find. Thanks for the info on laser cutting. After struggling with some design errors in my snow plow because of bad measuring and cutting, I think my next build is going to be laser cut and 3D printed parts. I'm thinking an all door boxcar might be kind of a fun one of a kind project..

    • November 7, 2017 5:26 PM EST
      • Sparta, TN
         
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      My prints came in last week:

       

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    • November 18, 2017 11:36 AM EST
      • Cumming, GA
         
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      Cool project.  Looks like something my RR could use. Be interesting to see when complete.  Later RJD

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