Handling Unexpected Feature ID

Here are a few common issues that can cause unexpected feature ID:

Chamfer shown as Contour Surface

This can occur when a modeled chamfer does not have a consistent angle across the length of the chamfer, unintentionally creating swarf geometry. This would need to be surfaced to be machined as modeled on a three-axis milling machine.

Chamfer shown as Slanted Face

This occurs when a chamfer has no bends, and is not a problem.

Small Nonstandard Chamfers at Triple Edge Intersections

When three faces come together at a sharp corner, if each edge has a chamfer applied then a small extra chamfer at the "triple corner" may be present. This chamfer will have a different angle and may not be easily machined as modeled.

For example, when three 45 degree chamfers converge, a 35 degree corner chamfer may be modeled.

Pocket shown as Contour Surface

The wall of a pocket can be designed with a shallow (and nearly imperceptible) draft angle. Since pockets are required to have vertical walls relative to the machining axis, this causes drafted pockets to be classified as freeform contour surfaces.