Advanced Constraints

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Introduction: Advanced Constraints

现在,您将创建一个口袋特性--一个箭头,指示使用推杆的方向。这将给你更多的建模和CAM实践。

1) Right click the side of the solid model and chooseCreate Sketch.

2) In the ribbon, chooseSketch>Rectangle>2-Point Rectangle.

Alternatively, usehotkey R.

3) Draw a rectangle to the right of the open circle. This will be the base of the arrow.

As you draw the rectangle, enter dimensions0.75for the height and2.5for the width. You can dimension objects as you draw them--just like you did when you created the circle. Or, you can roughly draw the rectangle, use hotkey D, and create dimensions after the fact.

Note that vertical and horizontal constraints have automatically been applied to the rectangle: you can tell by matching the icons next to each edge with the constraint icons in the Sketch Palette.

Step 1:

Step 2: Sketch Arrow Part I

4) Usehotkey Lto activate the line tool.

5) Off to the side, draw a closed triangle. You will move it into place as the head of the arrow later.

6) Usehotkey Dto activate the dimension tool.

7) 将垂直侧标注为1.75.

8) Click the points on the far right and the bottom of the triangle to create a new dimension.

9) Rather than entering a number here, when the cursor is active in the dimension box, click on the 1.75" dimension you just created. A numbered dimension should appear in the dimension box--in my case, d15. Now, type "/2" after that dimension to divide it in two. Hit enter.

你只是created a function. This means that anytime you change d15--the back of the arrow head--the front of the head will proportionately scale. It's a great practice to use functions as much as possible to make your designs more easily editable.

Step 3:

Step 4: Sketch Arrow Part II

10) Drag the triangle near the right side of the rectangle.

11) Usehotkey Dto activate the dimension tool.

12) Click the far right vertex of the triangle and the top left corner of the rectangle, then move the cursor to the left and click to create a dimension.

This dimension should be vertical--the dimension arrows will point up and down.

13) Again, rather than typing a number, click the dimension for the height of the rectangle, 0.75"--for me, d9--and type "/2" to divide it by two. Hit Enter.

The text for the dimension should be "fx: 0.375." This will ensure that the triangle is vertically aligned with the rectangle.

步骤5:

Step 6:

14) Select theColinearconstraint in the Sketch Palette on the left side. This constraint aligns two features on the same line.

15) Click the right side of the rectangle and the left side of the triangle to make them colinear.

This will ensure that the triangle is horizontally aligned with the rectangle.

16) Right click and choose OK to deactivate the colinear tool.

17) Drag the arrow to the exact location where you want it, ideally evenly spaced between the circle and the right edge of the push stick.

18) Usehotkey T激活修剪工具。

19) Click twice to remove the lines between the rectangle and triangle.

Don't worry if you delete constraints in this process.

20) In the ribbon, clickStop Sketchto exit the edit Sketch state.

Step 7:

Step 8: Second Extrusion

21) Click the home icon by the View Cube for an isometric view.

22) In the ribbon, choose创建>挤出.

Alternatively, usehotkey E.

23) Click the inside of the arrow, andtype -0.25for the extrusion distance.

Notice in the Extrude window that the Operation has turned into Cut, because you entered a negative value. You can use the extrude tool not only to add material, but also to cut it out, join two objects, or create new models from intersections.

24) Hit Enter to create the extrusion.

The geometry you just created is called a口袋because it is bounded by a contour and has a flat bottom.

25) Save.

Congratulations! You have extruded your first sketch into a solid body! Share a screen-capture of your model below.

Step 9:

40 People Made This Project!

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