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# Robot Modelling and Assembling Day 3

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### Robot Modelling and Assembling Day 3

1. 1. Week 2 Day 1Workshop by
2. 2. Highlights of Previous Lecture• What is CAD and its advantages?• Introduction to Pro/ENGINEER and its environment• Introduction to Sketch mode and its tools
3. 3. Today’s Lecture• Dimensions – Definition – Weak Dimensions – Strong Dimensions – How to use Dimensions to give a required shape• Constraints – Definition – Types of Constraints• Practicing Dimensions and Constraints
4. 4. Dimensions• Definition – Measurement of entities • Length • Radius, Diameter • Angles
5. 5. Weak vs. Strong Dimensions• Weak Dimensions – Are grey in color – made automatically by the software – Can be modified by dragging the edges of shape(s)• Strong Dimensions – Are in white color – Have to be entered manually – Locks the shape, i.e. the feature cannot be dragged to change
6. 6. Dimensioning a Shape• Draw a rectangle, randomly of any size• Now we want to make its size• Double click the weak dimensions – They will become editable – Enter the desired values
7. 7. Radius & Diameter Dimensions• To this rectangle, add Fillet of dimension 3 units – Fillet measuring dimension is Radius• Now add a circle at the center of this shape of diameter 5 units or radius 2.5 units
8. 8. Angular Dimensions• Draw 2 lines of any dimensions, both meeting at one point• Click the Dimension tool• Select the two lines• Now click the MMB between these lines
9. 9. Constraints• Definition – A limitation or restriction• Why they are used? – To give our drawings a definite shape• Types – Horizontal, Vertical, Perpendicular, Tangent, Equal Parallel, Symmetric
10. 10. Using Constraints• Click the constraint icon• pops-up a window, with title “Constraints”• Draw different shapes and apply them• Represented by letters and symbols
11. 11. Horizontal Constraint• Makes any line horizontal• Represented by letter “H” Horizontal constraint
12. 12. Vertical Constraint• Makes any line vertical• Represented by letter “V” Vertical constraint
13. 13. Parallel Constraint• Makes two line Parallel to each other• Represented by the symbol “//” Parallel constraint
14. 14. Perpendicular Constraint• Makes two lines perpendicular to each other• Also called “Orthogonal” constraint Perpendicular constraint
15. 15. Equal Constraint• Makes two entities equal to each other• Applied to radius (R), diameter, length (L), angles measurement Equal constraint
16. 16. Tangential Constraint• Makes a point tangent to the curve• Represented by letter “T” Tangential constraint
17. 17. Applying Constraints• Equilateral Triangle• Isosceles Triangle
18. 18. Equilateral Triangle
19. 19. Isosceles Triangle
20. 20. Practice Drawing 1
21. 21. Practice Drawing 2