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Boundary Style gibbscam

Here you define the type of boundary to be used. In some cases, what you have selected in the workspace will control your available options.

Boundary Type

There are 5 boundary types: Bounding Box (default), Silhouette, Shallow Areas, Cutter Contact Areas and Selected Curves. The boundary type will be limited to Cutter Contact Area or Silhouette if you have selected faces on a model or will be limited to Selected Curves if you have selected a closed shape.

Bounding Box uses the stock dimensions from the Document Control dialog box as the area from which to calculate toolpath.
Silhouette creates a 2D shape using the edges of the model or selected faces as seen from the tool axis (i.e., normal to the Machining CS).
Shallow Areas will only look at the relatively flat areas of the model, typically less than 45 degrees.
Cutter Contact Areas will only look at areas where the cutter is in contact with the selected model. This item is intended for faces at an angle less than 80 degrees.
Selected Curves will machine within one or more closed geometric shapes. For this item to be available the geometry must be selected.


This is the tolerance of the boundary calculation. A smaller value provides a more accurate, detailed boundary but takes longer to calculate.

Minimum Diameter

This is a setting that can create a simpler boundary shape. Boundaries with a distance between two points that is smaller than this value will not be included in the boundary calculation.


After the boundary is calculated they can be offset by this amount. Adding a small offset value can be helpful in eliminating boundaries with jagged edges. This value can be as large as the tool radius.

Extra Surface Stock

This values is added to cutter calculation in order to keep the tool away from constraint faces.


Most machining operations and the creation of 3D boundaries constrains or limits the tool center to the edge of the boundary or surface; the tool can move no further than this. When creating a boundary with Cutter Contact Areas, you can constrain or limit the tool contact point to the boundary instead, in effect the machinable area is offset by the radius of the cutter. When using Center Point, the tool center point is always within the boundary. When using Contact Point, an edge of the cutter is always within the boundary.

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