Learn 3D Drawing Basics

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To create this part in 3D, we will simply need polylines.

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You will see in this video how they will be converted into three-dimensional elements

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with commands such as Extrude and Revolve.

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In this example, we can see several rectangles.

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A rectangle is a certain kind of a closed polyline.

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Here is one,

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here another …

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and here are more
rectangles – in total we have six.

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Here we have a circle

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and on the other side
we have two closed polylines.

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Let’s now create this part in 3D.

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We first work with this rectangle, whose corners should be rounded.

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We launch therefore the FILLET command to create an arc around corners

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and use for example a radius of 1mm.

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We select here and here and press ENTER.

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We do this for the 4 corners of the rectangle.

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We also create arcs in the lower left corner of the rectangle located around the circle

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and also for the rectangle that is just behind.

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As we will now need to use the 3D tools we switch to the “3D modeling” workspace.

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We choose an isometric view.

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Let’s perform a 12 mm extrusion of the larger rectangle.

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Now let’s move the inner rectangle from the base to the top.

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We extrude the inner rectangle with a negative value of 0.5 mm.

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As a result we have 2 boxes.

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Then we use SUBTRACT to generate a new shape from the subtraction of the small box …

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… press ENTER …

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… from the large one – press ENTER.

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Here is another rectangle. We extrude it with a negative value of 8 mm.

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We copy this piece to the other end.

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Now let’s create a thread by revolving this closed polyline.

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We indicate the axis by 2 points and validate with Enter the default value of 360 degrees.

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Next, let’s create some layers to organize the drawing.

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We assign colors to the layers.

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We move this solid to the layer Connector

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and then hide the layer.

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We also have this polyline that we want to revolve as well.

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Please pay attention that we have here a small “tooth.

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It is important to reach the desired effect.

Achieving the desired outcome

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We launch the REVOLVE command, select the polyline and indicate the axis that will be this one.

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We move this object to the layer named Plastic.

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Now we again activate the layer “connector”.

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We need to relocate this element

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and for that, we simply use  the MOVE command with a vector from here to the middle.

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Let’s take the opportunity to move all the 3D elements we created

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to the correct elevation with respect to the figures that have not yet been extruded.

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We have some more work with the latest polylines.

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We extrude the two greatest shapes with a height of 5 mm to make a SUBTRACT operation

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between the exterior and the interior solid.

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And we generate a gap.

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Next, we move these last 2 figures with the MOVE command and extrude 5 mm.

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Then, again, make a subtraction between them.

Using the MIRROR Command for a symmetric copy

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From a top view, we can use the MIRROR command for a symmetric copy.

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Although, to maintain the original design of the object …

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… we shall again use MIRROR following this axis …

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… and indicate that this time, we want to delete the source.

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Besides, from a top view, we will make a new symmetry of this element, to add one on the other side.

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But this time, we need to move it by 8 units…

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… and make a new symmetry.

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We have achieved a 3D part very easily in
very few operations.

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It’s that easy to convert 2D elements (closed polylines, rectangles, and circles)

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into 3D elements, through the Extrude and
Revolve commands to create threads –

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and then use basic editing commands such as MOVE, COPY, and MIRROR.

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These are very basic and commonly used 2D features that we also frequently need for 3D.

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