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Guidelines for creating flat boundary surfaces in mastercam

Guidelines for creating flat boundary surfaces

These items are guidelines to create flat boundary surfaces.

  • If you are selecting multiple chains, there must be one outermost chain, which defines the outer boundary of the surface. Additional chains must be nested within this boundary. Nested chains form holes in the flat boundary surface.

The following graphic shows a before and after picture of three entities. To view the resulting surface with all three chains selected, hold your mouse over the graphic. Notice that the resulting flat boundary surface has two holes from the nested chains.



  • Select chains in any order. Mastercam will determine if the selections are nested or disjointed.
  • If you select disjointed chains, Mastercam will create multiple surfaces.
  • Chord height tolerance is set in the Maximum surface deviation field on the Tolerances tab of the System Configuration dialog box.
  • You can use the Manual chaining method to select surface edges and surface curves. This chaining method can be used by selecting the Manual button to open the Chain Manual ribbon bar.
  • If you selected any open chains, Mastercam will prompt you to automatically close them. Choose Yes to close the chains or No to remove the open chains from calculation of the trimmed surface. If you choose Yes, Mastercam calculates (but does not create) a curve between the two open endpoints for the purpose of defining the closed boundary.
  • When you create a flat boundary surface, Mastercam keeps the original entities and places the new surface in the same location as those entities. Therefore, viewing or working with the new surface may be tricky. To more easily work with or view the new flat boundary surface, either delete, hide, or move the original entities, or move the new surface.


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