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# Curvature in SOLIDWORKS

Wednesday July 29, 2015 at 1:16pm

Today’s products are deceptively simple and minimalistic in form. Take mobile phones and tablets as examples, they look like a filleted cuboids – however looks can be deceptive.

Instead they have been optimised to have to have a perfect curvature, which can be almost invisible to the eye. These can be displayed with curvature combs: the longer length of the comb’s ‘teeth’, the greater the curvature.

The below image of an iPad demonstrates how the corners have the fillets slowly blend into the edges rather than a constant curvature.

The curvature can also be displayed at sketch level. Apart from Curvature Combs, other useful visualisation tools can be used to show Inflection Point and Minimum Radius. The Inflection Point shows the exact point where the curvature changes direction. Minimum Radius identifies and displays the radius amount the smallest radius in the spline.

Curvature in 3D can be defined as different curvature categories - Contact (C0), Tangency (C1) and Curvature (C2). Again the Curvature Combs display the transition between the surfaces.

So where are these options for these within SOLIDWORKS?

These options normally feature in the Surfacing commands as edge conditions, start/end constraints and tangency types. Below are screenshots of the Surface Fill and Surface Loft commands showing Contact (C0), Tangent (C1) and Curvature (C2).

Apart from the options in Surface modelling, there are now other C2 options within the Fillet command (new in SW 2014). These are available within the Face Fillet option (Continuous Curvature) and the Constant Radius Fillet (Conic Rho Value, try between 0.55 and 0.65).

A new addition to SOLIDWORKS 2015 is the Surface Curvature Combs option. This can be toggled on/off by Right clicking upon the surface and choosing Surface Curvature Comb option. This allows Curvature Combs to be added at regular intervals (Persistent) or further interrogating the model with the Dynamic option.

Hopefully with these options you can create complicated and ergonomic curves.

By Richard Earley

Applications Engineer

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