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ES050 – Introductory Engineering Design and Innovation Studio 1 Features Prof. Paul Kurowski
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2 Feature-Based Solid Modeling Parts modeled by adding features to a base part Features “represent” manufacturing “operations” holes, ribs, fillets, chamfers, slots, pockets, etc. Material can be added or subtracted Features can be created by extrusion, sweeping, revolving, etc.
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3 Feature-based Modeling Process Create base part Add features until final shape is achieved Extruded BaseExtruded Cut ES1050 part 01.SLDPRT
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4 Examples Extruded BaseExtruded CutRib ES050 part 03.SLDPRT
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5 Extruded Base Extruded Cut Fillet Extruded Boss
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6 Tools for Creating Features Geometry is defined by sketching a 2D profile on a plane, and “extending” it into 3D These profiles can be extended to 3D by: Extruding Revolving Sweeping Lofting These operations can add material or cut it away
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7 Tools for Creating Features
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8 Extrusion Sweep Hole Revolution Loft Extruded cut Sample of features
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9 Extruded Part Profile Extrude
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10 Revolved Part
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11 Swept Part
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12 Lofted Part
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13 Other Features Fillets, chamfers and rounds Shelling Holes Ribs
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14 Example Rib Round Fillet Hole Shell
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15 Alternative Modeling Approaches There are usually many ways to model an object A good approach requires few steps, and is easy to modify if necessary The modeling steps do not necessarily correspond to manufacturing steps Think the steps through before you start!
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16 Modeling a Bracket ES050 part 04.SLDPRT
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17 One Method Step 1Step 2Step 3 ES050 part 04.SLDPRT
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18 Alternative method Step 1Step 2Step 3
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19 Exercise Alternative sequence of modeling operations Extruded BaseExtruded CutRib
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20 Exercise Alternative sequence of modeling operations
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21 Exercise Alternative sequence of modeling operations
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22 Exercise Alternative sequence of modeling operations
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ES050 – Introductory Engineering Design and Innovation Studio 23 Parameters and Sketching
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24 Outline Design intent and parametric modelling Constraint types “Smart sketching” Examples
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25 Parametric modeling Also know as Constraint-based User constrains geometry based on Design Intent Design variations can be generated by changing a few key dimensions Geometry is automatically regenerated based on constraints
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26 Example D1 D2=D1/2 D4=D3/2 D3=2*D1 The part should be twice as long as it is wide The hole should be centered in both directions The hole diameter should be 50mm D5=50
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27 Sketch parameters (dimensions) constrained by equations Feature created with that sketch + Cut extrude added ES050 part 02.SLDPRT
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28 Smart Sketching Most CAD systems use “smart” sketching tools Design intent is inferred, and constraints added automatically as you draw For example, two lines that are nearly perpendicular “snap” perpendicular, with a constraint SolidWorks calls this “Automatic Relations”
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29 SolidWorks Automatic Relations (Geometric Constraints)
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30 Before adding constraints
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31 After adding geometric constraints Tangent Concentric Perpendicular
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32 After adding dimensional constraints
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33 Constraint Types Geometric constraints Dimensional constraints
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34 Boolean operations Geometric constraints Dimensional constraints boolean.SLDPRT
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35 Summary Parametric modeling captures design intent Easy to modify part geometry by changing parameters
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36 Home work
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