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How can I extrude around the outside of a round face?

brian_sweetbrian_sweet Member Posts: 10
I have a basic ring the I would like to remove a diamond shape pattern all the way around it.  I was able to do one with a tangent plane.  tut I am at a lose how to do that many times around it.  I thought multi plain might be the answer, but either I am doing it wrong or it isn't meant do what I am trying to do.  

Here is my start:

https://cad.onshape.com/documents/665c0ed5ebd690d47908381b/w/8d731be1cdd8f44a59e9eede/e/0157ae2f40c73d8a1d0e4ec2

As an example, let's say I want to have12 diamonds around the ring evenly spaced.  

Any help to this newbie would be greatly appreciated. 

Best Answers

  • PrachiPrachi Member, OS Professional Posts: 262 ✭✭✭
    Answer ✓
    Feature pattern.

  • PrachiPrachi Member, OS Professional Posts: 262 ✭✭✭
    Answer ✓
    Little more work on this example but the holes don't overlap like a straight extrude.
    https://cad.onshape.com/documents/1249a62cc918c7b9b008fbec/w/416e108a56778eeea8823df6/e/8252077a16e0a785453855ae

  • matthew_stacymatthew_stacy Member Posts: 476 PRO
    Answer ✓
    @brian_sweet, a few key mathematical tools for this endeavor are:
    1. Circumference = PI * D
    2. Arc_length = R * Theta (with the angle specified in radians)
    3. Use the floor() function to truncate any calculated pattern count to a whole number (i.e. round down)

    How to implement the math functions depend on what your trying to do.  Explicitly defining a variable for every parameter overconstrains the problem and will result in mathematical or geometric conflicts.  For example #Ring_size, #Lattice_width, and #Diamond_size can potentially conflict with one another.  #Pattern_Count has the potential to further conflict with these.  Imagine red ink in your feature-tree or lattice lofts overlapping / spilling off the top or bottom.

    You will have to choose a small number of INDEPENDENT variables and allow all other parameters to float (automatically scaling according to the specified independent variables).

    By way of example, here is a simplified version of your model with the upper and lower triangle lofts omitted for clarity:  https://cad.onshape.com/documents/02f15cc45132085896aa6f5b/w/9c9fc970396d7e20ae17cee1/e/8c8c76e0ef28eb38b5c8f346.  Most of the features (Extrude 1 height, pattern count) scale directly from #Diamond_size. 

    Happy modeling!

Answers

  • PrachiPrachi Member, OS Professional Posts: 262 ✭✭✭
    Answer ✓
    Feature pattern.

  • brian_sweetbrian_sweet Member Posts: 10
    Thank you, that was so simple.  Thanks for giving me the opportunity to learn
  • PrachiPrachi Member, OS Professional Posts: 262 ✭✭✭
    Answer ✓
    Little more work on this example but the holes don't overlap like a straight extrude.
    https://cad.onshape.com/documents/1249a62cc918c7b9b008fbec/w/416e108a56778eeea8823df6/e/8252077a16e0a785453855ae

  • brian_sweetbrian_sweet Member Posts: 10
    That's even better.  I was messing around with the file, but here is the design I am looking for using your loft idea:
    https://cad.onshape.com/documents/315f6616a46a1eceda8a161b/w/e8f39b6733b49dc2eaa1453b/e/38cac24dabd0a93aea4b98db

    Not sure you you want/can to provide me any more additional advice, this is more a mathematical calculation help (My college Trig courses are long wiped from memory...lol). 

    When doing the circular pattern with this design, I am tying to figure out how to adjust the pattern count to the lattice spacing and to make the spacing even. With pattern count at 25 and spacing at 2 it looks close, but you can see the spacing before then next patter starts is a little bigger. 

    My goal would be to be able to change the diameter for a larger/smaller bracelet size and have the lattice spacing even. 

    And Lastly thank you for your help.  I started 3d printing a year ago and want to design things, tinker cad was to basic and OnShape had a bit more learning curve.  But I can't tell you how much (even when I get frustrated when it doesn't work) I love working on designs in OnShape
  • matthew_stacymatthew_stacy Member Posts: 476 PRO
    Answer ✓
    @brian_sweet, a few key mathematical tools for this endeavor are:
    1. Circumference = PI * D
    2. Arc_length = R * Theta (with the angle specified in radians)
    3. Use the floor() function to truncate any calculated pattern count to a whole number (i.e. round down)

    How to implement the math functions depend on what your trying to do.  Explicitly defining a variable for every parameter overconstrains the problem and will result in mathematical or geometric conflicts.  For example #Ring_size, #Lattice_width, and #Diamond_size can potentially conflict with one another.  #Pattern_Count has the potential to further conflict with these.  Imagine red ink in your feature-tree or lattice lofts overlapping / spilling off the top or bottom.

    You will have to choose a small number of INDEPENDENT variables and allow all other parameters to float (automatically scaling according to the specified independent variables).

    By way of example, here is a simplified version of your model with the upper and lower triangle lofts omitted for clarity:  https://cad.onshape.com/documents/02f15cc45132085896aa6f5b/w/9c9fc970396d7e20ae17cee1/e/8c8c76e0ef28eb38b5c8f346.  Most of the features (Extrude 1 height, pattern count) scale directly from #Diamond_size. 

    Happy modeling!
  • brian_sweetbrian_sweet Member Posts: 10
    This was so helpful.  MANY THANKS!
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