Tuesday, January 7, 2014

Inventor Surfacing : Hourglass Spring

In this tutorial you learn to model an hourglass shaped spring as shown in image below:

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Start with changing the view to Home

 

 

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Click the Home icon  in the View Cube.





Expand the Origin folder from the Browser Bar.
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Start a 2D Sketch image from the 3D Model > Sketch panel and pick the XZ Plane from the Browser.



Create a circle of size 12
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From the Work Features panel, select
Offset from Plane

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Create two more Work Planes parallel to the XZ plane on each side at distance 20.
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Create circles of size 24 in each of the planes


From the 3D Model  > Create panel, select Loftimage and in the dialog that appears, select Surface as output type.

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Click inside the list for Sections where it reads ‘Click to add’ and pick the larger circle as shown.


Next, pick the smaller circle in the middle and finally the other larger circle.
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A lofted surface appears.


Click OK to close the Loft dialog.

In the XY plane, create a sketch as shown in image.
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The sketch consists of a dark blue line which starts outside the limits of the lofted surface and ends inside the surface but does not actually touch the axis.

Also create the vertical axis as a line first and then converting the line to construction by right-clicking on the line and selecting Construction image
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Upon Finishing the sketch image it appears as shown.
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From the 3D Model > Create panel, select Coil image 

Specify the Output type as Surface in the Coil dialog:

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Hide the lofted surface if required by turning OFF its visibility from the Browser Bar.
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In the Coil dialog, click the button for Profile and select the line as shown.



Click the button for Axis and specify the construction line as axis.
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In the Coil Size tab, specify Pitch as 3 and 12 revolutions.

A surface will be formed as show which has a cylindrical profile.

We want to change it to an hourglass shape using the lofted surface.

Turn ON Visibility for the lofted surface.
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Select 3D Sketch image from the 3D Model panel.

Select Intersection Curve image and pick the lofted surface as the first set of geometry.

In the dialog click the second button for Intersecting Geometry and select the helical surface.

Click OK in the 3D Intersection Curve dialog.
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The intersection curve appears.

Turn OFF visibility for both surfaces.
Finish the sketch image and from the Work Features panel, select Normal to Curve at Point

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Select the end point of the intersection curve as shown in image.


Then select the curve itself when a new Work Plane begins to appear.
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Sketch a circle in the newly created work plane and create a Sweep image feature using the circle as profile and intersection curve as path to create the hourglass shaped spring.
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Finally on the Tools panel tab, select Appearance imagein the Material and Appearance panel.

Set the Selection Filter to Faces and Edges from the quick access menu of Inventor as shown in image.
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Select multiple faces using the Ctrl and in the Appearance Browser dialog, select a color swatch and right-click on the swatch and select assign to Selection.

How about creating your own, brand new, fully functional CAD system with surfacing capabilities using a geometric modeling kernel.

cMayoCAD from CADVertex is one such program.

Download the detailed course contents for cMayoCAD here.

cMayoCAD2





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