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Lesson 7: 2D Sketch Tools – Videos – 7.1 – 7.7

• Overview: You will learn about the 2D sketch tools and link them to 3D design tasks. Aim To introduce students to the 2D sketch tools and the project function.

• Learning Outcomes: - Use the Primitives menu to sketch 2D shape and lines. - Use the sketch menu to draw polylines and splines. - Use the sketch menu to create arcs. - Use the sketch menu to fillet and trim 2D shapes. - Locate the project function in the sketch menu. - Use project function to project a 3D object.

Key Vocabulary Radius A straight line going from the centre of a circle or sphere to the

edge of the circle or sphere.Ellipse A shape that looks like a stretched circle. Polyline A series of line segments connected by points.

Spline A curve that connects two or more specific points.Arc A part of a curve, especially a part of the circumference (outside

edge) of a circle. Extend Make larger.projection A thing that extends outwards from something else.

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- 7-1 Sketching in 2D: (Using primitives menu)

- Rectangle: 1. GO to the top main menu. In the primitives menu, FIND the white 2d

shapes to the far right and SELECT the rectangle.

- Circle: 1. From the top primitives menu SELECT the circle . 2. A 2D circle is also easy to edit before it is placed in the workspace.

Using the context menu, ADJUST the circle radius to 15.

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You may put whatever you want for radius values.

3. CLICK on the grid to place, the circle in the workspace.

- Ellipse: 1. GO back to the top primitives menu and SELECT an ellipse .

- Polygon: 1. This time, from the top primitives menu SELECT the polygon

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2. Using the value menu, ADJUST the polygon to have a radius of 10 and to have 8 sides.

3. PLACE it next to the ellipse by CLICKING on the grid. 4. You have now placed five 2D shapes on your grid.

- 7-2 Polyline and Spline

- Polyline and spline functions let you make unusual shapes that are not in the basic menu. You can be creative in what you draw using these functions. - Polyline:

1. GO to the top main menu and CLICK on the sketch button. Then

SELECT the polyline tool from the pop up menu. CLICK on the grid to activate the tool.

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2. PRESS the ESC on the keyboard to end drawing.

- Spline: 1. GO to the top menu sketch button and CLICK on the sketch tool. CLICK on the

spline tool and then CLICK in the workspace to start drawing another shape.

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2. CLICK to create points along the shape. Make sure you create a closed shape by

finishing on the first point you created.

3. PRESS ESC to finish drawing. 4. You can SELECT the object and then SELECT its points to EDIT them. In a

spline.

7-3 Sketching in 2D: (Using sketch menu)

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The same of 2D shapes in the primitives menu, but in sketch menu there are more interactive workflow, by not using the context menu but instead use workspace feedback and menus.

- 7-4 Arc Types:

• Two Point Arc:

From the sketch menu, there are 2 different arc creation tools. SELECT the first arc tool- Two Point Arc- and CLICK on the grid.

1. The first click is the centre of the new arc.

2. The second click will be the start of the arc.

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3. You can CLICK on the grid to set the end of the arc or input the value you want. For this lesson, you need to INPUT a value of 180. Or any degree values you want.

• Three Point Arc: 1. GO to the sketch sub menu and SELECT the other arc - Three Point Arc.

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2. CLICK the grid, and then CLICK to set the start of the arc.

3. CLICK to set the end of the arc.

4. The last click sets a point you want on the arc.

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The centre of the arc is worked out automatically to create an arc to match your 3 selected points.

5. CLICK the green tick button to finish. 7-5 Fillet and Trim:

• Fillet: Filleting allows you to change corners to rounds and to turn sharp edges into curves. It is a handy tool to have in your design box. 1. GO to the sketch menu and SELECT the fillet button. CLICK the fillet button.

2. SELECT the corner of the shape you want to fillet.

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3. A yellow arrow will appear, DRAG this arrow to set the amount of fillet.

You need a large fillet. GRAB the yellow arrow to ADJUST the level of roundness. 4. There is a limit to the amount of roundness you can apply. 5. Next, you are going to explore the trim and extend tools. 6. GO to the sketch menu, CLICK the first polyline with the first point inside the box and the second point outside the box. 7. CLICK the Green Tick, to finish.

• Trim: 1. GO to the main tool menu, SELECT the sketch menu and CLICK the trim tool.

2. MOVE your mouse over the polyline you just created. Any line that turns red will be trimmed with a mouse click, while the trim tool is active.

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3. Now, MOVE your mouse over the line that is outside the box. When it turns

red, CLICK to remove the line.

• Extend: 1. GO to the sketch menu and CLICK the extend tool.

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2. MOVE your mouse over the line that is inside the box. A red highlighted line shows the line extension you want.

3. CLICK to extend the line across the box. Note: this new line has created 2 separate 2D shapes from the original box.

4. CLICK the green tick button to finish.

7-6 Offset:

The offset tool in the sketch menu allows you to create offsets or inset for shapes. A shape can be repeated within itself or outside the shape, with accuracy, like a window and its frame. It is used to create an inset that is larger or smaller than the selection.

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The offset tool allows us to do this very precisely.

1. GO to the sketch menu, SELECT the offset tool.

2. Once the tool is active, SELECT the circle, then the line you want as an inset.

3. When you SELECT the circle, a red highlight will appear. CLICK on the red highlight to create an offset of the original shape inside the circle.

4. SELECT the new area you have created between the two circles and CLICK the gear menu. SELECT extrude. This is an example of an easy way to create walls. The offset can be inside the shape or outside the shape.

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7-5 project:

Projecting is a powerful way to transfer the shape of one 3D object to another 3D object. To use the projector tool, you need an interesting shape to project from. ADD an octagon. RAISE it above the grid, finally ROTATE it 45 degrees.

1. GO to the sketch menu and SELECT the project tool.

2. The first click SELECTS what plane you are projecting to. You will select the main grid.

3. A preview of the element under your mouse is now displayed on the grid.

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4. You can CLICK to confirm to project the element you want onto the grid.

5. Now a new 2D shape has been projected to the grid.

6. You can now SELECT it, and use the gear menu to EXTRUDE and create a 3D

shape.

• You can also PROJECT to a surface of an object instead of the grid.