Parametric Threaded Ogive Rocket Nose Cone

by bld, published

Parametric Threaded Ogive Rocket Nose Cone by bld Jul 22, 2012
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6732Views 2175Downloads Found in Engineering


Fully parametric ogive nose cone with a screw-on base. This allows the nosecone to be entirely printed, and used as a small payload bay. The ogive shape is created by revolving a circular arc, combined with a spherical tip. Uses syvwlch's thread library. More parametric model rocket parts to come. Default size is for some extra thin-walled 1.63"/41.5mm diameter cardboard body tube I have. Includes integrated reinforcement bar and mounting holes for tying a shock cord to the base.

Now available at Github: https://github.com/bld/Parametric-Threaded-Ogive-Rocket-Nose-Cone


  1. Download syvwlch's Screw Library: http://www.thingiverse.com/thing:8793
  2. Measure body tube inner & outer diameters and enter
  3. Select other parameters
  4. Render & export STL for "fitcheck" part
  5. Print fitcheck.stl and check fit in body tube. It shouldn't be too tight or too loose. You want it to come loose easily with the ejection charge, but not rattle around.
  6. Adjust & reprint if necessary.
  7. Print nosecone and base once the fitcheck part works to your liking.
  8. Thread shock cord through holes in base and tie.
  9. Screw cone onto base.

I printed this on my Makergear Mosaic with the following Slic3r settings:

  • No support material
  • 0.25 mm layer thickness
  • 3 solid layers, 2 perimeters
  • 0.1 fill density with rectilinear fill


  • The threads tend to curl up a little while printing at 0.25 mm, but the base and cone do so equally so the threaded together without trouble.
  • Due to some slack in the threads, the base can end up slightly off-center when tightened. Unscrew and rescrew pressing away from the side that's short.
  • Mine came out a little heavy, so for smaller, lighter rockets, check the balance to make sure it isn't too nose heavy: http://www.wikihow.com/Calculate-Stability-of-a-Model-Rocket

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First off, this is great! Thank you.

I'm having a bit of trouble with the base. The top of the threaded section is a flat surface, not hollowed out like shown in the pictures, so I can't get to the back side of the shock cord tether. I assume that I am doing something wrong, noob that I am...any suggestions? It's rendering solid in OpenSCAD, too. The STL of the base that you provided prints as shown in your pics.


I would like to make a derivative of ogive-threaded.scad that uses options for different kinds of ogives (secant, Haack series, etc.), and use it in making a master for a fiberglass nose cone mold. Is that cool?


 That would be cool. Go right ahead. Just make it CC-BY-SA compatible.