ES1050 – Introductory Engineering Design and Innovation Studio 1 Computer Aided Design (CAD) Part 2 Prof. Paul Kurowski

2 In the first lesson: We have learned a brief history of CAD We have introduced SolidWorks CAD system We have explained what does it mean that a SolidWorks is solid and feature based. Now we’ll build a simple model.

3 Open a new part 1 2

4 Create a 2D sketch Building the first feature begins with a 2D sketch on one of the reference planes that come with a new part. Learn how to make these planes visible.

5 Create a 2D sketch Select Front Plane (either from Feature Manager window or Model view widow) and open Sketch on this plane

6 Create a 2D sketch Draw a circle 100mm in diameter with the centre coincident with the origin of the sketch.

7 Extrude 2D sketch into 3D feature Select Extrude tab, then Extrude Boss/Base, specify the length of extrusion 160mm, click Accept

8 Examine the 3D feature We have created the first (and so far the only) feature which is a solid cylinder 100mm in diameter, 160mm long. Use the above menu to show these dimensions. These dimensions are not “set in stone”. They are Parameters and can be changed.

Modify the 3D feature Follow the steps above to change the length of cylinder. The diameter can be changed the same way.

10 Add the second feature Open a 2D sketch on the end face of the cylinder and draw a circle 60mm diameter. This circle can now be used either to create another extrusion (cylinder) or an extruded cut (hole). The cylinder would be a positive feature, the hole would be a negative feature. Will make a hole. Open sketch on this face

11 Add the second feature Select Extrude tab, then Extruded Cut specify the length of extrusion Through All. 1

12 Define material properties Define material properties: 1060 Alloy 1 2

13 Examine model with two features Both features we have created need sketches.

14 Add one more feature From features menu select Fillet, specify 10mm fillet size. From Model view select edge where you want to add a fillet, click Accept button. Fillet feature does not need a sketch. 1 2

15 Review and save the part The part has now three features defined by four parameters that show here are part dimensions. All of the can be changed as long as part topology remains the same. Try re-ordering the features to see that model won’t rebuild. Save part as ex01.SLDPRT ex01.SLDPRT

16 In this lesson we have: Created 2D sketches Created positive and negative features Modified model geometry taking advantage of parametric formulation of SolidWorks CAD system Defined material properties In the next lesson we’ll examine more modeling techniques to create parts of just about any complexity Summary