Choosing Primary and Target Surfaces (Fillet Surface)

You are first prompted to select the Primary Surface, then the Target Surface (the two intersecting surfaces to be filleted). The system searches back and forth in the specified direction along the Primary surface for the intersection points with the Target Surface.

If you choose incorrectly

In the case of a plane and a cylinder, if you choose the plane as the Primary Surface it will result in an incorrect search path.

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The fillet surface is created with a break where the search passes tangent to the cylinder looking for the Target Surface. No arc is created at that point because the system does not find an intersection point there.

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Note also, that the arcs that make up the rest of the surface are not evenly spaced. Again, this is because the wrong surface is chosen as the Primary Surface. This occurs if the same Primary and Target surfaces are chosen, but the other direction is selected.

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If you choose correcty

In the case of a plane and a cylinder, if you choose the cylinder as the Primary Surface it will result in a correct search path.

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The fillet surface is closed and the resulting arc centers are evenly spaced.

$image\ar.gif$ Click here for graphic explanation