JUSTIFICACIÓN Y OBJETIVOS
CAPÍTULO 1. INTRODUCCIÓN 1.1. Definición de microplástico
1.2. Principales fuentes de emisión de microplásticos
In this exercise, geometrical constraints will be used on sketches to create 3D features.
1 Expand the folder called Section 4-2 and Open the file called Constraints-Exercise1.ipt, then immediately Save As... under the filename of Constraints-Ex1 to preserve the original file for other users (overwrite if necessary).
Figure 02 Coordinate System Indicator - Off
2 Click the Application Menu bar and from the drop-down menu click on Application Options... to display the Options dialog box.
3 Select the Sketch tab and under Display, ensure the checkbox is unticked for Coordinate system indicator.
Figure 01 Constraints-Ex1 Exercise
4 On the Sketch panel of the Model tab, click the Create 2D Sketch tool and select the face on the part as shown below.
Figure 03 Select Face
Figure 04 Sketch Face Selected
face
5 On the Draw panel of the Sketch tab, click the Two Point
Rectange tool and sketch a rectangle on the face as shown below.
Figure 05 Rectangle
6 On the Draw panel of the Sketch tab, click the Center Point Circle tool and create two circles centred on the edges of the rectangle and coincident to the corners.
7 Hold the [Shift] key down and select the lines on each end of the rectangle (they turn blue), then press the [Delete] key to delete the lines (or use Trim to have the same effect).
Figure 06 Circles
Delete these lines
8 On the Modify panel of the Sketch tab, click the Trim tool and select the inside semi-circles.
Figure 07 Delete
9 On the Constrain panel of the Sketch tab, click the Tangent constraint tool and apply tangent constraints between the arcs and lines at the four corners of the slot sketch by selecting a line near its endpoint, then select the arc near the same endpoint. Repeat this process for each corner of the slot.
Figure 10 Tangent
10 On the Constrain panel of the Sketch tab, click the Vertical constraint tool and select the midpoint of the left edge and the centrepoint on the circle.
Figure 11 Vertical Midpoint
11 On the Constrain panel of the Sketch tab, click the Horizontal constraint tool and select the midpoint of the face and the midpoint on the slot.
Midpoint
The slot sketch should now be centred on the face
12 On the Exit panel of the Sketch tab, click the Finish Sketch button to exit Sketch mode and return to Model mode.
Figure 12 Horizontal
14 On the ViewCube select the top left-hand corner 'hot spot' of the cube as shown below.
Figure 13 Extrude
Figure 14 Isometric View
15 On the Sketch panel of the Model tab, click the Create 2D Sketch tool and select the face on the part as shown overpage.
Before After
13 On the Create panel of the Model tab, click the Extrude tool and select the slot area of the sketch. In the Extents drop-down list, select All and click the Cut option. Click OK.
SELF ASSESSMENT
16 Repeat the steps 4-13 to create a slot on this sketch face of the part.
Figure 15 Select Face
Figure 16 Sketch Face
Figure 17 Second Slot
17 On the Sketch panel of the Model tab, click the Create 2D Sketch tool and select select the face on the part as shown on Figure 18.
Figure 18 Select Face Figure 19 Sketch Face
18 On the Navigation Bar on the Graphics Window, click the View Face tool and select the same face to rotate the view normal to the face.
Figure 20 Look At
19 On the Draw panel of the Sketch tab, click the Center Point Circle tool and sketch the circle shown below, then select the
Line tool and sketch the three lines shown below.
Ensure the sloping lines are at a tangent to the circle and parallel to the outside edges using the Glyph constraints.
20 On the Modify panel of the Sketch tab, click the Trim tool and select the circle on the inside of the sketch to delete.
Figure 21 Sketch Figure 22 Trim
21 On the Constrain panel of the Sketch tab, click the Vertical constraint tool and ensure the centrepoint of the circle and the midpoint of the horizontal line on the sketch are vertical.
22 Click the Parallel constraint tool and ensure the outside sloping edge on the left and the inside sloping edge on the same side are parallel.
Figure 23 Vertical Constraint Figure 24 Parallel Constraint
23 Click the Colinear constraint tool and select the top edge of the block and then the horizontal line in the sketch. Right-click and select Done.
Right-click to display the pop-up shortcut menu and select Finish Sketch.
Midpoint
Parallel
24 On the ViewCube, click on the top left-hand corner 'hot-spot' to create the Isometric View shown below.
Figure 27 Isometric View
Figure 28 Extrude
25 On the Create panel of the Model tab, click the Extrude tool to display the dialog box (or press [E] on the keyboard).
26 Click inside the sketch profile. In the Extents drop-down list, select All and click on the Cut option, then click OK.
Figure 29 Completed Part
27 Save As... the part as YOUR INITIALS-BLOCK and close all files.
End of Constraints-Exercise1.
This page intentionally left blank