3D Printed Pattern and Core Box

Discussion in 'Pattern making' started by FKreider, Jul 8, 2019.

  1. FKreider

    FKreider Copper

    Thought I'd share a pattern and core box that I've been working on (slowly) over the past 6 weeks or so. It is a decorative dome/cover for the safety valves on a 7 1/4" gauge live steam locomotive. The original part was too small for the boiler (as it was built) so a slightly larger casting is needed. The complicated part was the fact that the boiler on this particular engine is angled so the curves are different on the "front" and "back" sides of the dome. This proved to be quite difficult to draw in fusion 360.

    This will be cast in yellow brass, hopefully in the next week or two.

    image2 (1).jpeg image2.jpeg image3.jpeg image1.jpeg image4.jpeg image12.jpeg
    HotRodTractor, dtsh, _Jason and 2 others like this.
  2. DavidF

    DavidF Administrator Staff Member Banner Member

    Looks great! Cant wait to see the casting :D
  3. Melterskelter

    Melterskelter Gold Banner Member

    Looks like a very fine pattern. Lovely finish and curves.

    The core will be green sand?

  4. PatJ

    PatJ Silver

    Nice work with all those curves.
    Tricky stuff.

  5. FKreider

    FKreider Copper

    Just realized I never followed up on here with pictures of the casting.

    Here it is right after cleaning up with files and sandpaper:

    Part way through machining (picture and machining by customer):

    Polished up and on the customer's locomotive: (note the engine is not yet complete, there will be painted shrouds covering the steam lines that come out the sides of the dome.)
  6. Melterskelter

    Melterskelter Gold Banner Member

    Very fine work! Handsome.

  7. Beautiful! What did you paint the pattern with? And what did you use for the registration pins? Thanks
  8. FKreider

    FKreider Copper


    I get the finish by using layers of 2-in-1 filler primer spray paint and bondo spot putty. Its very time consuming as I typically wait a day between every layer but its necessary in order to get a good surface finish on the casting.

    I order dowel pins from McMAsterCarr in the sizes that I need and that is what I use for index pins. The holes are printed right into the pattern and if you do your design math right they are a press fit in one side. ;)
    David McCauley likes this.
  9. Billy Elmore

    Billy Elmore Silver

    Fine looking P-51 Mustang wing in the background! Somebody likes flying RC airplanes! Nice job on the casting!
  10. Sawyer massey

    Sawyer massey Silver

    What scale is the loco ......nice
  11. Oldarm

    Oldarm Copper

    Oh boy! The dedication. Greatly admired.

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