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Posts Tagged ‘curvature’

SOLIDWORKS: Continuity and Curvature Part II

Saturday, March 24th, 2018

In Part I of this series, we looked at how the smoothness of curves can be analyzed and controlled. Now we’ll be taking a look at some additional analyses tools to further evaluate our surfaces as well as ways to improve our curvature continuous connections.

The zebra stripes tool (view>display>zebra stripes) allows us to see small changes on a surface that may be hard to see with a standard display. This tool mimics the reflection of long stripes of light on a very shiny surface. With zebra stripes, we can verify that two adjacent faces are in contact, are tangent, or have continuous curvature. As can be seen in the image below, the zebra stripes for contact do not have the same direction or size. The zebra stripes for tangent have the same direction, but change sizes where the tangency occurs – there are two points of tangency. And the curvature continuous stripes share the same direction and the same size throughout the entire surface.

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SOLIDWORKS: Continuity and Curvature

Wednesday, November 22nd, 2017

I like nice curves and I cannot lie. And in SOLIDWORKS we can control exactly how smooth our curves are. When it comes to curves in SOLIDWORKS, there is a difference between what is smooth and what looks smooth. This blog will discuss how we can analyze our curves and control how smooth they really are by using surface evaluation tools and different spline tools.

The quality of a great surface lies within the curve that defines it. These curves are ideally created and controlled through splines. The spline sketch tool creates a smooth curve through the position of control vertices, or CV’s. Controlling the quality of our splines will ultimately control the quality of our surfaces. Splines can be analyzed using the curvature combs tool. The curvature combs tool graphically shows the amount of curvature at a given point on a sketch element. A smooth curvature comb is desired to produce the smoothest surface. As shown below, both splines look the same until we look at their curvature combs. The spline with the smoothest curvature combs (i.e. no flat spots or dips exist) will produce the smoothest surface.

SOLIDWORKS: Continuity and Curvature SOLIDWORKS: Continuity and Curvature

To create smooth curvature combs, splines should be created with the least amount of points possible. Just as seen above, both of these splines are identical. The difference in curvature combs is due to the fact that the spline on the left was made with just 2 points, whereas the spline on the right was made with 5.

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