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Trying to cut an elliptical ring between angled surfaces

Question asked by Alissa Murphy on Sep 21, 2018
Latest reply on Sep 28, 2018 by Alissa Murphy

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Hi, I've been trying to cut an elliptical ring between two angled surfaces, using either a lofted/surface cut or a swept cut, and neither seem possible. I'd love to hear other ideas. If you take a look at the attached picture, I'm trying to taper the tip of this needle from the ledge to the tip. The sketch shows the part I'm trying to cut away consistently along the elliptical surface of the needle. The lofted cut would need to be a ring between the surfaces (which is apparently impossible) and a swept cut won't follow my elliptical path. Thank you for any help!

Alissa

Paul Salvador Sep 28, 2018 1:44 PM

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Alissa,.. it may be bcuz the loft surface used in the replace face is visible,.. so, you would need to hide it or delete it.

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Jeff Mowry Sep 25, 2018 7:34 PM

It's fairly simple, but I'd approach it with surfaces.

Loft an ellipse on the bottom of your needle that's 0.50 (units) offset from your inner edge to an ellipse on your ledge, as a surface feature. Then use the Cut with Surface feature to remove the part of the needle you don't want and this will form the taper you want.

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Jeff Mowry Sep 25, 2018 7:42 PM

Attached is a quick sample file in v2017 format, for reference.

Sometimes you also have to build a sort of "end face" for your Cut with Surface feature to work properly.

Ellipses get weird when you offset them inward (like I did with this model), but it should be enough to show how to perform the cut you need.

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Elliptical-Surf-Cut.SLDPRT.zip173.9 KB

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Alissa Murphy @ Jeff Mowry on Sep 28, 2018 12:32 PM

Thanks so much! This seems like the right approach. Can you say a bit more about building an "end face" for the cut? I've created the loft but I'm getting the error "operation failed due to geometric condition" when I try to cut with surface. It doesn't seem like I can add more than one parameter during the cut step.

Many thanks,

Alissa

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Paul Salvador @ Alissa Murphy on Sep 28, 2018 12:58 PM

Alissa,.. try Replace Face.

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Alissa Murphy @ Alissa Murphy on Sep 28, 2018 1:03 PM

Thank you Paul and Jeff! The combination of the lofted surface and "replace face" worked!

Best,

Alissa

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Alissa Murphy @ Alissa Murphy on Sep 28, 2018 1:39 PM

Actually... back to the drawing board. I need to cut new features in that surface, and it seems I can't- the new surface remains even through a cut. That doesn't seem to be true for the "cut with surface" feature (I tested it on Jeff's part). So I'm still happy to hear any advice about how to make that feature work by including an end face (or other possibilities).

Thanks!

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Paul Salvador @ Alissa Murphy on Sep 28, 2018 1:44 PM

Alissa,.. it may be bcuz the loft surface used in the replace face is visible,.. so, you would need to hide it or delete it.

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Alissa Murphy @ Paul Salvador on Sep 28, 2018 5:39 PM

Got it! Thanks!

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John Stoltzfus Sep 28, 2018 12:35 PM

Did you try the chamfer tool?

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9 Replies

Jeff Mowry Sep 25, 2018 7:34 PM
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Correct Answer
It's fairly simple, but I'd approach it with surfaces.

Loft an ellipse on the bottom of your needle that's 0.50 (units) offset from your inner edge to an ellipse on your ledge, as a surface feature. Then use the Cut with Surface feature to remove the part of the needle you don't want and this will form the taper you want.
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Jeff Mowry Sep 25, 2018 7:42 PM
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Attached is a quick sample file in v2017 format, for reference.
Sometimes you also have to build a sort of "end face" for your Cut with Surface feature to work properly.

Ellipses get weird when you offset them inward (like I did with this model), but it should be enough to show how to perform the cut you need.
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- Elliptical-Surf-Cut.SLDPRT.zip173.9 KB
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- Alissa Murphy @ Jeff Mowry on Sep 28, 2018 12:32 PM
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  Thanks so much! This seems like the right approach. Can you say a bit more about building an "end face" for the cut? I've created the loft but I'm getting the error "operation failed due to geometric condition" when I try to cut with surface. It doesn't seem like I can add more than one parameter during the cut step.
  
  Many thanks,
  Alissa
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  - Paul Salvador @ Alissa Murphy on Sep 28, 2018 12:58 PM
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    Alissa,.. try Replace Face.
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  - Alissa Murphy @ Alissa Murphy on Sep 28, 2018 1:03 PM
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    Thank you Paul and Jeff! The combination of the lofted surface and "replace face" worked!
    
    Best,
    Alissa
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    - Alissa Murphy @ Alissa Murphy on Sep 28, 2018 1:39 PM
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      Actually... back to the drawing board. I need to cut new features in that surface, and it seems I can't- the new surface remains even through a cut. That doesn't seem to be true for the "cut with surface" feature (I tested it on Jeff's part). So I'm still happy to hear any advice about how to make that feature work by including an end face (or other possibilities).
      
      Thanks!
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      - Paul Salvador @ Alissa Murphy on Sep 28, 2018 1:44 PM
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        Alissa,.. it may be bcuz the loft surface used in the replace face is visible,.. so, you would need to hide it or delete it.
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        Alissa Murphy @ Paul Salvador on Sep 28, 2018 5:39 PM
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        Got it! Thanks!
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John Stoltzfus Sep 28, 2018 12:35 PM
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Did you try the chamfer tool?
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Trying to cut an elliptical ring between angled surfaces

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