One of the most important techniques in
3D modeling is learning to create
2D Sketches. What do I need to do to make this body?
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I'll be going through a tutorial myself to gain a better understanding of this technique. In a new file, we're going to start by selecting
Sketch and then
Create Sketch.
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On the
View Cube select
Front. Remember, you can only sketch on a
face or a
plane. Click to select the plane. You will now see that in the
Sketch palette has some
options and
constraints.
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Using the
"C" key to
Create Diameter Circle, we'll create four circles of different sizes as shown below. This option can also be found in the
Toolbar under
Sketch - Circle - Center Diameter Circle. You can type in the values in the box and press "Enter".
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From the
Sketch Tool, select
Sketch Dimension at the bottom of the
submenu. You can also press the
"D" key. Now, click on the
border of one circle and move the mouse towards the border of another
circle. A line will appear indicating the dimensions.
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We are going to draw some lines now. These lines will be
tangential to the circles. The red line indicates the symbol for
Tangent. You can press the
"L" key to start drawing lines.
Being able to sketch and model parts in CAD is an essential part of the
design process, and one very important aspect of
parametric CAD modeling is
constraints. It is a good rule to start adding
constraints before dimensions. Constraints are like
rules for the
sketches. For this example, you will apply various types of constraints.
You will notice that the
Tangent Constraint Symbol is now showing on the first and second one.
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Now continue all around between all the
circles and
lines.
To verify, from the
Sketch Palette, select
Tangent and between the circles and the line, place that
Constraint.
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If you select the
constraint and it's already there, you simply get an
error message. So if the constraint already exists the system will tell you.
Next thing I need to do is tidy up the
Sketch. To do that, I'm going to go to
Sketch -
Trim. The letter
"T" on the
keyboard will work as well.
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Click on those parts that I don't want.
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You can now see that the
Sketch is almost what I want for my
Profile. So I can stop the Sketch by clicking on the Stop Sketch option on the Toolbar.
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Go to my
Home View and complete making the body of that part.
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For this, I will select
Modify -
Press Pull.
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Select the
Profile and change the
Direction to
Symmetric so when I drag the
blue arrow, I will get the shape that I want.
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You can see how that is forming. I'm going to key in a value of
30 mm, giving me a
60 mm wide body and that's a new body. Click on
OK.
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So that was a good example of using a
Sketch to create a
Profile and then a
Body.
You can see down in our
Timeline, the
Sketch.
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If those values or dimensions are incorrect you can go back and modify them, or select the
Extrusion tool to modify those values.
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One final advice, don't forget to
Stop Sketch, to go back to see your
Model.
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