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manishdasariya1-Visitor
1-Visitor
January 27, 2018
Solved

Make spiral casing

  • January 27, 2018
  • 3 replies
  • 5504 views

For about two weeks I am trying to make this for my project-

Untitled.png

 

I have tried Sweep, sweep blend, boundary blend and other approaches.

But result is not satisfactory.

How can I do it?

Best answer by jhaston-3

1. I didn't remove any section, I did something similar to that shown in your second sketch. I made a solid spiral, not a surface.

2. If your spiral was a solid it would have a flat face. You could use that face to extrude a cylinder normal to the face. This means there will be a small cusp between the cylindrical feature and the spiral (no tangency).

3. I made everything solid and created a shell feature afterwards.

4. I don't know how to answer that.

5. The intersecting cylinder is simply sketched on the plane that is perpendicular to the axis of the spiral and extruded in both directions. It was created as a solid before the shell feature. Rounds were added at the end.

The model I created was put together very quickly and likely not the best solution.

3 replies

Patriot_1776
Patriot_177622-Sapphire II
22-Sapphire II
January 27, 2018

Simple, use a sweep with 2 guide curves, make sure the variable section option is set, the section will be a circle, and make sure you constrain the 2 quadrants 180deg apart to both of the trajectories "reference".

 

The trajectory curves can be sketched or curves via equation, or use a single curve and make the diameter a function of trajpar, or there are a couple other ways....

    T
    TomD.inPDX17-Peridot
    17-Peridot
    January 28, 2018

    I'll name that tune with one guide curve 🙂

     

    Frank's right.  Sweep with the VSS option... an origin curve for one end and a guide curve for the outer periphery.  Sweep a variable circle/shape using both references.

      J
      jhaston-31-Visitor
      1-Visitor
      January 29, 2018

      Based on the suggestion provided by @Patriot_1776, using curves defined by equation in this case.

       

      Creo Parametric Sweep FeatureCreo Parametric Sweep Feature

        Patriot_1776
        Patriot_177622-Sapphire II
        22-Sapphire II
        January 29, 2018

        Yup!  As mentioned, there are several ways.  You can use a single trajectory as the guide, and use trajpar at the section level if you you want a straight linear change in diameter, or......do other things.....

        J
        jhaston-31-Visitor
        1-Visitor
        January 29, 2018

        I used equations in this case to get a quick model approximating the shape of features shown in the original screenshot.

         

        I'd probably sketch the trajectories for most sweeps, but I don't create swept features very often. Mostly parts with prismatic and cylindrical features, and assemblies. Sometimes more complex geometric forms, but I often have to try things out, experiment, research, learn from others and refine.

        J
        jhaston-31-Visitor
        1-Visitor
        February 10, 2018

        @manishdasariya, I came across this picture in an old book (c.1934) Engineering Wonders. It reminded me of your snail 🐵

        turbine.JPG

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