Don’t let your scanning source tell you that you cannot have editable models from your scan data.
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- Design Intent:
- Design intent means creating a 3D CAD model which attempts to remove manufacturing features and tolerances. This is used when one wants to retain intentions such as concentricity, parallelism, common fillet sizes, perpendicularity, hole patterns, arrays, etc. Assumptions are made by the designer based on what he sees as obvious.
- Some subjectivity is present here, so any background information or matting component geometry is recommended.
- Shrink is not taken into account, unless provided.
- “As Is”:
- “As is” refers to modeled as the part is scanned. The modeler surfaces what is actually in front of him. Hole spreads are not perfect, Cylinders not concentric, Perpendicularity is not considered, etc. The CAD designer merely fits surfaces to the scan geometry
- This is commonly cheaper, however when arrays and circular patterns are present, this become much more expensive.
- If your intention is 2D prints, this may not be the way to go, as it is difficult to create views and document surfaces that are not normal to the views you will be creating.
- If one prefers an “As is” model, however would prefer certain aspects to be patterned, this can still be accomplished with some forethought and communication. For example, if one is scanning a Turbine and wants circular pattern used on an “Average” blade, we can do this.
- This can be a good option for parts with large amounts of patterned geometry.
I am always looking for interesting things to post about, so check back often, leave a comment or suggest a subject.