Engineering Fundamentals 3D Modeling

Goals for today ● Overview of available design tools Engineering Fundamentals ● Conceptual Design vs Prototyping 3D Modeling vs Detail Design ● Learning to learn, investing Professor Will Schleter ● Whirlwind tour of OnShape April, 2019 EF 151 Workshop 3D Modeling Why Onshape? ● Parametric 3D Design ● Browser based, no software installation, cloud file storage ○ Onshape.com ● Created by group that left Solidworks ○ Autodesk Fusion 360 ● Sharing and collaboration ○ Autodesk Inventor ○ Solidworks ● Ease of use ○ OpenSCAD (scripting) ● Free educational license ● 3D Modeling ● Good online training ○ Blender ● Similar terminology and methodology to other systems ○ Sketchup ● Regular and frequent updates ○ 3D Builder (Windows) ○ Autocad Onshape Basics https://cad.onshape.com Invest in Yourself - Learn to learn ● Get an educational account ● Get excited about learning new things ● Viewing ● Continue to learn - ask questions, practice, be aware ● Sketching ● Teachers are guides ● Sketched Features ● Suggested online resource: ○ Extrude, Revolve, Sweep, Loft ○ Onshape Learning Center ● Combining Features ○ Self Paced ○ New, Add, Remove, Intersect ○ Learning Pathway ● Placed Features ○ CAD Fundamentals ■ Minimal - Navigating, Sketching, Part Design ○ Fillets, Chamfers, Shell, Draft, Rib, Patterns ■ Good info - Multi-parts, Assemblies ● Multiple Parts and Assemblies ■ Extra for certificate - Drawings ● Exporting for 3D Printing Frequently Used Keys and Mouse Commands Sketching Details Modifiers Dimensions ● alt-C - command search ● f - zoom to fit Geometry Constraints ● ctrl-? - Show all keyboard shortcuts ● z, shift-z - zoom out/in ● Test ideas with no dimensions, ● Blue vs. Black - black is fully constrained ● ctrl-z - Undo ● n - view normal to then re-edit to add sizing ● One sketch - multiple features or parts ● delete - delete selected item(s) ● arrows - rotate view ● Avoid too much detail ● Text (dimension to size) ● space - clear selection ● wheel - zoom ● Constraint inferences (hold shift to disable) ● Transform ● esc - back out of command ● right mouse drag - rotate view ● First dimension scales entire sketch ● Construction Geometry (Q) ● Use logical constraints where possible ● ● shift - suppress constraint inferences ctrl-right mouse drag - pan view ● Use blue handles to explore degrees of freedom ● left mouse click - select ● p - toggle planes on/off ● Use image as reference ● right mouse click - context menu ● Everything connected (shaded area) ● selection box - drag right - enclosed, ● Dimensioning (click in blank space to place text) ● Mirror (Symmetry) drag left - crossing OnShape Tidbits Feature Types ● Sketched Features: Extrude, Revolve, Sweep, Loft Extrude Revolve Shell ● Combining Features: New, Add, Remove, Intersect ● Placed Features: Fillet, Chamfer, Shell, Hole, Patterns, Mirror 2nd Sketch Extrude/Add ● Part Operations: Boolean (Union, Subtract, Intersect), Split, Transform ● Face Operations: Move Holes Pattern ● Add-ons: Featurescript (Gears, Threads, Curved Text, …) Extrude/Remove Extrude/Intersect Loft ● Assemblies - combinations of parts to show fit and motion ● Variables - use to control dimensions on several features/parts Fillet Chamfer Draft Sweep Making Changes Design Considerations for 3D Printing ● Use meaningful names! ● Size - 3D printing is slow - ● Material - Common materials are ● Double click is your friend minimize size and volume PLA and ABS. ABS is not as brittle ● The feature list ● Complexity - Very complex and slightly stronger. ○ Editing sketches Feature details won’t print well - try ideas ● Supports - try to avoid or add as (geometry, dimensions, constraints) out on a small object if in part of model ○ Editing features Sketch (thickness, extrusion type, pattern count) question. ● Minimize material - thin walls, ○ Reordering features ● Orientation - Typically need a flat cutouts if possible, consider ○ Rollback bar surface to build up from. Layer other methods ● “Design Intent” orientation might affect strength. ● Printability - consider making Rollback Bar ● “Everything is related” ● Overhangs - 45° rule, Spanning multiple simple parts and assembling Example Suggestions and Common Issues ● Avoid surfaces - select faces, not edges ● Avoid extra parts- make sure Merge Scope is set correctly ● Avoid too much detail ● Features with errors - delete or fix ● If fillets or chamfers don’t work, try a smaller size and/or doing in several steps ● Create cosmetic features last (fillets, NOTES chamfers, threads, text) ● Thinner ● Multiple Parts ● Simplified ● Stress Points ● Print Orientation ● Text Onshape - Export to STL (3D Printing) Onshape - Export to DXF (Lasercutter, CNC Router) ● Right click on Part Studio tab ● Right click on any planar or individual part in Parts List surface ● Export ● Export ● Use settings shown ● Use settings shown ● Give it a meaningful name ● Give it a meaningful name ● STL file will be saved in ● DXF file will be saved in downloads folder of browser downloads folder of browser Planar Surface ● Copy to USB drive to move to ● Copy to USB drive to move to printer printer Part List Part Studio Tab.

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