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Adding fins to rocket tail...

evan_rossevan_ross Member Posts: 5
I'm building the tail section for a model rocket.  It's basically a cone (small side down, big side up) with fins attached.
The problem is the fins.  I make a sketch and then do a symmetric extrusion.
The edges of the extrusion don't touch the cone.
Is there a way to make that happen?

Comments

  • Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,568
    Hi Evan,

    Can you post the URL of your document here? It'll be easier to help that way.
    Jake Rosenfeld - Modeling Team
  • evan_rossevan_ross Member Posts: 5
    edited September 2017
    https://cad.onshape.com/documents/c65007e1a62931dc2b0783f0/w/405e8efe19e6f5cefda176f1/e/2c56bf5d454bec31c45c51d2
    I modified it slightly as an experiment trying to embed the edge of the fin into the cone.
  • jakeramsleyjakeramsley Member, Moderator, Onshape Employees, Developers Posts: 611
    If you are making the side profile like that, I would use a replace face to make sure the two parts meet properly.  I modified the sketch a bit to make the gap easier to see.

    1. Start a replace face and select the end cap of the face that you want to touch to be the "Face to replace".


    2. Select the outer face of the rocket to be the "Surface to replace with".  This will try to rip off the face you are replacing and replace it with another one that fits the same surface as the rocket.  It will then extend other edges/faces of the part in order to make a valid part.  As the face of the rocket is cyclical, there are two potential solutions it could find.  If you are finding the fin going all the way through, click "Flip alignment" to get the other solution.

    Jake Ramsley

    Director of Quality Engineering & Release Manager              onshape.com
  • larry_haweslarry_hawes Member Posts: 438 PRO
    That's great tip feature I did not know existed.
  • evan_rossevan_ross Member Posts: 5
    Hmm, it's not quite working for me (probably pilot error / lack of experience).
    Once the fins are joined to the cone, I want to have a concave fillet to blend the side of the fin into the surface of the cone.
  • lanalana Onshape Employees Posts: 537
    @evan_ross
    Use Boolean feature to merge fins to the cone then Fillet the resulting edges
  • evan_rossevan_ross Member Posts: 5
    Woohoo!!!   The toughest part was finding a way to select the face of the fin to be replaced.  Had to zoom in all the way and find the tiny gap between the fin and the cone's surface.
    It would probably be easier if i'd switched to x-ray view.
    Now I know for next time.

  • owen_sparksowen_sparks Member, Developers Posts: 2,660 PRO
    evan_ross said:
    Woohoo!!!   The toughest part was finding a way to select the face of the fin to be replaced.  Had to zoom in all the way and find the tiny gap between the fin and the cone's surface.
    It would probably be easier if i'd switched to x-ray view.
    Now I know for next time.

    The "hide part" option (either from right click menu or keyboard shortcut "y") is your friend here.

    Owen S.
    Business Systems and Configuration Controller
    HWM-Water Ltd
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