NC tool path generation must process, ignore, and step over extraneous edges and surfaces. Displaying the model becomes slower and inconsistent. Associative drawings may be incorrect, ambiguous, or undimensionable. The program may not specify tolerances and surface finishes properly. Model files become unnecessarily large, causing excessive loading, saving, and processing times.
Clean models are more efficient and cause less work for downstream applications.
Create continuous surfaces that are not broken or trimmed unnecessarily. Delete excess geometry early and often. Always locate reference geometry such as profiles, reference lines, and templates on a reference layer. Construct solids using the fewest steps. Avoid narrow faces and small corner angles that cause tolerance errors.