Forums Modeling Technical Modeling
  • Topic: 3D Printed Trucks

    Back To Topics
    (1 rate)
    • January 9, 2019 1:51 AM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      3D Printed Trucks

      Over the last few weeks I've been toying with the idea of making my own archbar trucks.  So I sat down at the puter, fired up Fusion 360 and started drawing.  After several iterations, I've come up with a prototype.  They are printed in 3 parts and then put together with the wheel sets to make a complete truck.

       

       

      The bolster is inserted in the pocket of the side frames and then it is screwed in at the top.  Here is the first print.

       

       

      I've since added the spring detail to the ends of the bolster.  Not sure how it will turn out but it is on the printer now.

       

       

      You can just see the scalloping on the ends of the bolster that I hope will resemble a spring.  I will continue to add detail as I fine tune the design.  There will be a model with bearings.  I've ordered some 3x6x2 and 3x10x4 bearings and once they arrive where I can get the exact measurements, I will modify the design to accept the them.  Don't pay any attention to the colors.  Since these are prototypes and don't take much filament, I am just using up whatever small rolls I have lying around.  I am using PLA for the prototypes but will use PETG for the production models.  Let me know if you see any issues or details that I need to add.  When I am comfortable with a production model, I will be glad to share the STL file with any of you that would like them.

      This post was edited by Dan Hilyer at January 9, 2019 7:39 PM EST
      ____________________________________

       

    • January 9, 2019 2:06 AM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      Here is a comparison with Bachmann trucks.  Again, I don't have the detail, yet, but they are functional.

       

      ____________________________________

       

    • January 9, 2019 6:26 AM EST
      • Pittsburgh, Pennsylvania
         
      • Posts
        10,516
      • Thanks
        93
      • Thanked
        724

      That's cool. And how much would these cost to make?

      ____________________________________

      Shannon car Shops
      Home of the infamous leg lamp

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

      and King Butt Modeler

    • January 9, 2019 9:18 AM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      The 3D printed parts are less than a quarter for the 3 pieces that make up one truck. Of course you still have to add the wheelsets which is the bulk of the cost for commercial trucks. Bearings will add about $4 per truck. Not sure they are needed for most cars. 

      ____________________________________

       

    • January 9, 2019 3:24 PM EST
      • Pittsburgh, Pennsylvania
         
      • Posts
        10,516
      • Thanks
        93
      • Thanked
        724

      Bearings help, but aren't really needed in the commercially available trucks.

       

      So the truck, after R&D, costs about a quarter. Ya know, if you start making trucks that aren't commercially available, you might have a market. Trucks like the Andrews truck, "T" section Bettendorf, even arch-bar trucks of different design/wheelbases.

      ____________________________________

      Shannon car Shops
      Home of the infamous leg lamp

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

      and King Butt Modeler

    • January 9, 2019 4:03 PM EST
      • Shut Up Rooster
         
      • Posts
        8,429
      • Thanks
        152
      • Thanked
        677

      I would think that these trucks need at least some equalization, they look rigid right now.

      Greg

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • January 9, 2019 4:10 PM EST
      • Holiday Inn Express, School of train repair
         
      • Posts
        777
      • Thanks
        868
      • Thanked
        605

      Cool stuff Dan.

       

      Here is my contribution to the idea pile...

       

      Two different Fox pressed steel trucks (pre 1900):

       

       

      The second version is the design used on the Leslie Snow Plows in the early 1900s. They were adjustable for both NG and SG.

       

      This is a different style used under  rotary OY:

       

       

      Chrysler:

       

      Civil war era..

       

       

      Disclaimer: No Roosters were harmed in the making of this post.

       

      And that is all I have to say about that.

      ____________________________________

       

      Boomer

       

      These Bachmann connies are great but you gotta hit'em jusssst rightttt!

       

    • January 9, 2019 5:10 PM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      Greg, can you elaborate on “equalization”?

      ____________________________________

       

    • January 9, 2019 5:18 PM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      David, most any design is possible. The issue comes in the details. Small details are difficult with an FDM style printer,  not possible but the printer must be dialed in. Creating the design files are straight forward but what you see in the design doesn’t always translate to the printed product. At least with my printer. With all that said, I am working on a Bettendorf now and should have it ready in a couple days. Looking at Boomer’s requests, I may be busy for a while .

      ____________________________________

       

    • January 9, 2019 11:16 PM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      Ok, here is a rough draft of a Bettendorf T Truck side frame.  I haven't printed this one yet.  I still have to design the bolster.

       

       

      ____________________________________

       

    • January 10, 2019 12:32 AM EST
      • Vail, Az
         
      • Posts
        4,726
      • Thanks
        1,019
      • Thanked
        827

      Fox Pressed Steel truck.^

      Have fun....

       

      ____________________________________

      John

       

      The older I get, the less I know, please don't make me prove it.

       

       

    • January 10, 2019 2:48 PM EST
      • Fort Myers Beach & Annapolis, Florida & Maryland
         
      • Posts
        2,001
      • Thanks
        47
      • Thanked
        241

      Dan Hilyer said:

      Greg, can you elaborate on “equalization”?

       

      All you ever wanted to kmow about "equalization".

      The principles of model locomotive suspension

      Basically, it's about making the frame handle uneven track by allowing the axles/wheels to lift independently.  On an archbar model, you usually allow the sides to rock about the bolster - Bachmann does this with their loose screw.

      This post was edited by Pete Thornton at January 10, 2019 2:48 PM EST
      ____________________________________

       

        Pete

    • January 10, 2019 2:54 PM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      Thanks, Pete. I understand now. Great resource. I can provide for the equalization now that I know what it is. Just a small tweak to the design. 

      ____________________________________

       

    • January 11, 2019 8:37 AM EST
      • Saint Johns, Florida
         
      • Posts
        4,193
      • Thanks
        371
      • Thanked
        551

      Dan,

      What type of filament are you printing these with? I an running three boxcars with PLA printed trucks for the last 3 months. They are rigid and have been doing great. I use Bachmann 31mm metal wheels in them.

      ____________________________________

       

       Shut up Rooster

    • January 11, 2019 10:56 AM EST
      • Waverly, Alabama
         
      • Posts
        1,449
      • Thanks
        376
      • Thanked
        411

      Joe, right now I’m doing all the prototype printing with PLA. My plan is to use petg for the final prints. The only reason I’m considering petg is it’s ability to withstand higher temps. My concern is that I’ve had some PLA prints that were exposed to the summertime temps we get here deform somewhat. The most severe is a threaded container that was left in the direct sunlight.  The threads actually melted together to the point that when I did get the top off the threads came apart. Now, we don’t have any threads on the trucks so I may be overreacting. I think PLA is plenty strong enough for the intended use for the trucks and any small details will print better with PLA than PETG. PETG, IMO, will just be more stable.  I’m using the same Bachmann wheelsets.  I’ve also printed journal boxes and supports for single axles And I will probably use the Bachmann 24mm wheelsets for those. 

       

      I am working on several different designs .... primarily because I like the design process, I guess it’s the engineer in me..... so I will be glad to share the stl or Fusion files with you. Just let me know if you see something you like. 

      This post was edited by Dan Hilyer at January 11, 2019 10:58 AM EST
      ____________________________________

       

    • January 11, 2019 12:25 PM EST
      • Southwestern, NH
         
      • Posts
        437
      • Thanks
        42
      • Thanked
        82

      Dan,

       

      am not familiar with PETG is it similar to ABS? I tried a FDM printer several years ago and sent it back, I was looking to print some bigger parts and the machine although size compatible would not make a good large print. fast forward to today I have a form 2 sitting on my desktop, and will not look back. what is you long term desire with these trucks. are you going to print dozens or just a pair or two? if you are going to make dozens, then it would be worth while to get an STA print and have someone cast up them in white metal. much more durable in the long run, regardless of the detail level, and not that all expensive. if interested pm me for details.

       

      Al P.

    • January 11, 2019 12:27 PM EST
      • Easton , Massachusetts
         
      • Posts
        4,275
      • Thanks
        1,242
      • Thanked
        456

      OK now we know ... why the oven isn't finished ..it's held up in design ...

       

      ____________________________________

       My u-tube  My Vimeo

      The light in the tunnel might not be an engine , but a light in the caboose of my own train on my Roundy Round Rail Road !    My empire is complete...I think...

    • January 11, 2019 1:43 PM EST
      • Vail, Az
         
      • Posts
        4,726
      • Thanks
        1,019
      • Thanked
        827

      Sean McGillicuddy said:

      OK now we know ... why the oven isn't finished ..it's held up in design ...

       

      I suspect there is no desire to mess with the insulation, that's grunt work, not engineering!

      ____________________________________

      John

       

      The older I get, the less I know, please don't make me prove it.

       

       

    • January 11, 2019 3:00 PM EST
      • Saint Johns, Florida
         
      • Posts
        4,193
      • Thanks
        371
      • Thanked
        551

      Dan Hilyer said:

      Joe, right now I’m doing all the prototype printing with PLA. My plan is to use petg for the final prints. The only reason I’m considering petg is it’s ability to withstand higher temps. My concern is that I’ve had some PLA prints that were exposed to the summertime temps we get here deform somewhat. The most severe is a threaded container that was left in the direct sunlight.  The threads actually melted together to the point that when I did get the top off the threads came apart. Now, we don’t have any threads on the trucks so I may be overreacting. I think PLA is plenty strong enough for the intended use for the trucks and any small details will print better with PLA than PETG. PETG, IMO, will just be more stable.  I’m using the same Bachmann wheelsets.  I’ve also printed journal boxes and supports for single axles And I will probably use the Bachmann 24mm wheelsets for those. 

       

      I am working on several different designs .... primarily because I like the design process, I guess it’s the engineer in me..... so I will be glad to share the stl or Fusion files with you. Just let me know if you see something you like. 

      Dan,

      Like I already said, I printed mine in PLA. I tried the PETG but the details weren't good. I think I should have used a smaller nozzle (.2mm) instead of the .4mm I used. Any way I'm in the Jacksonville area of Florida. The trucks have been on three box cars for about three months with no problems. They are under the car so I guess they are shaded enough. So far so good on that count with PLA. As far as equalization goes, most of my locos don't have any and they do just fine, so why shouldn't a car? The answer is "they do"! I like your screwed bolster attachment. Mine are glued. Would you consider sending me your STL file so I can print out a set for evaluation? Are you using a Prusa printer? That's what I am using.

      ____________________________________

       

       Shut up Rooster

    • January 11, 2019 5:37 PM EST
      • Kittery, ME
         
      • Posts
        612
      • Thanks
        40
      • Thanked
        206

      I have been using ProPLA, made by 3D-Fuel.  It can withstand high temps, and you can anneal it in the oven for even higher temperature tolerance.  It is very easy to work with, and I have no trouble printing at the highest resolution my printer can handle (0.05 mm).  It's much more expensive than regular PLA, but I've found it to be much easier to deal with than PTEG or ABS.

Forums Modeling Technical Modeling

    Icon Legend

  • Topic has replies
    Hot topic
    Topic unread
    Topic doesn't have any replies
    Closed topic
    BBCode  is enabled
    HTML  is enabled

Add Reputation

Do you want to add reputation for this user by this post?

or cancel

Ads by Google