Active learning ideas
Generating Working Drawings from 3D Models is the final step in the technical communication process. It involves creating 2D orthographic views, sections, and detailed views directly from the 3D CAD model. These drawings must follow industry standards for dimensioning, line types, and layout to ensure they can be understood by anyone in the manufacturing process.
Activity 01
Students generate a working drawing of a part and display it. The class walks around with a checklist of NCCA drawing standards, identifying where dimensions are missing or where the layout could be improved.
How do we automatically generate a bill of materials (BOM) from an assembly?
Activity 02
Give students a complex 3D part and ask them to decide where the best place would be to take a section view. They discuss their choices in pairs, focusing on which view reveals the most internal detail.
What are the standard conventions for dimensioning a working drawing?
Activity 03
Groups create an assembly drawing with an automatic Bill of Materials. They must then cross-check the BOM against the 3D assembly to ensure all parts are correctly named and numbered.
How do section views improve the clarity of a complex part?
A few notes on teaching this unit
Watch Out for These Misconceptions
Students often think that the software will automatically place all the necessary dimensions in the right places.
Clarify that while the software can 'import' dimensions, the student must still arrange them for clarity and follow dimensioning rules. Peer-reviewing drawings for 'readability' helps students understand the importance of good layout.
There is a common error in not updating the drawing after the 3D model has been changed.
Demonstrate the 'associativity' of CAD, how changes in the model reflect in the drawing. Having students purposefully change a dimension in the model and then check their drawing in pairs reinforces this concept.
Methods used in this brief
Introduction to Parametric CAD
Students use SolidWorks to create 2D sketches and extrude them into 3D features. They learn the importance of fully defining sketches with dimensions and relations.
8 methodologies
3D Assembly and Mates
Combining individual 3D parts into a functional assembly. Students apply standard and advanced mates to simulate real-world mechanical movement.
8 methodologies