3D Printing Free 3D printed fin can design for HPR

Discussion in '3-D Printing and Related topics' started by Ben Martin, Nov 29, 2018.

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  1. Feb 20, 2019 #61

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

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    I absolutely love this design. I am now printing it in Pink ABS.
     
  2. Feb 20, 2019 #62

    Ben Martin

    Ben Martin

    Ben Martin

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    Thanks. The one that you printed for me will be getting its first flight test in a week, looking forward to seeing how it performs.
     
  3. Feb 20, 2019 #63

    cwbullet

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    Did you figure out what type of mailing tube?
     
  4. Jun 10, 2019 #64

    Ben Martin

    Ben Martin

    Ben Martin

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    The fincan performed flawlessly on its first test flight. The payload tube did not have the same fate. Really late ejection charge did some damage, thankfully it's easily repairable. Happy with the 3D printed fin can so far, thanks for printing it cwbullet! Screenshot_20190608-204650_VideoFramePlayer.jpeg Screenshot_20190609-001316_VideoFramePlayer.jpeg Screenshot_20190609-001425_VideoFramePlayer.jpeg Screenshot_20190609-001657_VideoFramePlayer.jpeg 20190608_213123.jpeg
     
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  5. Jun 10, 2019 #65

    vcp

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    I don't think a lot of people have appreciated that yet. Unless you induce some warp or have a seriously mal-adjusted printer, printed fin alignment will always be 'perfect'. Roll induced by fins should be gone - stresses on the model should be reduced.
     
  6. Jun 10, 2019 #66

    Ben Martin

    Ben Martin

    Ben Martin

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    Exactly. There was practically zero roll during the takeoff.

    Video of flight:

     
  7. Jun 10, 2019 #67

    cwbullet

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    Great flight. Now, you juts need another tube.
     
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  8. Jun 10, 2019 #68

    Ben Martin

    Ben Martin

    Ben Martin

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    Just have to unscrew the "damaged" one and replace it, simple repair.
     
  9. Jun 10, 2019 #69

    cwbullet

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    How do you order those tubes?
     
  10. Jun 10, 2019 #70

    Ben Martin

    Ben Martin

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    My dad owns a graphics shop so he has a bunch of them laying around. I use the 3in tubes with thinner walls. I'll try to figure out an comparable brand.
     
  11. Jun 10, 2019 #71

    cwbullet

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    What color is the exterior?
     
  12. Jun 11, 2019 #72

    Ben Martin

    Ben Martin

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    This tube was brown on the outside with a white film on the inside. The other rocket I made used brown on the outside and inside.
     
  13. Jun 11, 2019 #73

    vcp

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    That video should sell a hundred printers. Even a master craftsman can't get fillets and bevels exactly symmetrical.
     
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  14. Jun 12, 2019 #74

    liv3mind

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    Thank you, just started a print of this, no idea what I will use it for yet
     
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  15. Jun 12, 2019 #75

    hobie1dog

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    Makes you wish all rockets had these. Much time could be saved, allowing us to spend valuable time doing other things in life.
     
  16. Jun 12, 2019 #76

    cwbullet

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    It was one of the easiest prints but it does take a long time to print and a little elbow grease to sand.
     
  17. Jun 12, 2019 #77

    Ben Martin

    Ben Martin

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    It should be able to fit standard 3in tubes (fiberglass and LOC) but I'll make different variations just incase. I will also be scaling it up to a 4in version and below 3in if anyone has requests. The long print time is worth the great flights, plus it's an easy print with no extreme overhangs.
     
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  18. Jun 17, 2019 #78

    liv3mind

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    Successful print, sized for 3” MAC canvas. Thanks for an awesome file!

    IMG_0551.jpg
     
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  19. Jun 17, 2019 #79

    Ben Martin

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    Looks great, hopefully you will get some good flights out of it!
     
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  20. Jun 20, 2019 #80

    opcon

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    Hi Ben, what CAD software did you use to create this design? Would you be willing to share those files?
     
  21. Jun 20, 2019 #81

    Ben Martin

    Ben Martin

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    I used Inventor to 3D model it. The design files are in the Thingiverse download as the native .ipt file.
     
  22. Jun 21, 2019 at 12:34 PM #82

    opcon

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    Thanks, I'll have to get Inventor
     
  23. Jun 22, 2019 at 2:25 AM #83

    Ben Martin

    Ben Martin

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    It's free for students but really expensive if you're not in school or it's not provided by your work. A free alternative is Fusion 360 which is similar to Inventor.
     
  24. Jun 25, 2019 at 9:27 AM #84

    opcon

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    I was able to get the Inventor Professional 2020 as an engineering student. I am pretty decent at Fusion 360, but had to do some fumbling around to be able to recreate your design and create new designs for smaller fin cans. I'm experimenting now in trying to get the curvature correct for a Von Karman nose cone using MATLAB and export that data into Excel and then import it into AutoCAD to create the curve and then import into Inventor to create the cone. Having a bit of difficulty with the math in MATLAB, but I am getting close.
     
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  25. Jun 25, 2019 at 1:02 PM #85

    Ben Martin

    Ben Martin

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    Could always trace the shape of an image in Inventor to make the nosecone. Saves a lot of work.
     
  26. Jun 25, 2019 at 2:49 PM #86

    opcon

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    MATLAB finally provided the correct X,Y coordinates (user error :D). Copied X,Y coordinates into Excel. Ran the insert Points tool in 2D Sketch mode, selected the Excel file and choose the Create spline option. Drew a line on the X axis and changed it to a center line then drew a rectangle for the shoulder. Finished sketch and used Revolve on the spline and rectangle since I had a center line it knew what I wanted. Ran the Shell tool and hollowed out the nose cone and shoulder. I am happy with the results. 5.5 to 1 Von Karman - 25mm nose cone.png
     
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  27. Jun 25, 2019 at 2:52 PM #87

    Nytrunner

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    Very nice!

    If you were still stuck at lunchtime, I was going to ask for the dimensions you needed. Solidworks' formula driven curve makes haak and parabolic cones very easy.
     

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