To the way that AutoCAD-based applications like Autodesk Civil 3D are. FilesAutodeskAutoCAD 2019C3DHelpCivil TutorialsDrawings.
Topics covered in this Lesson: An introduction to drafting in 3 DimensionsINTRODUCTION - WHY 3-D?You may have already figured out why CAD has many advantages over manual drafting. One big advantage is that once you've drawn something, you shouldn't have to draw it again. If you manually drew a house plan, you would have to draw a front elevation, side elevations, and possibly a perspective view. With one 3-D CAD model, you can generate views from any angle either inside or outside the house and animations. Afterwards, if your client needs something changed, you can then make the changes once and re-render your views. If you're drawing mechanical parts, you can generate virtual prototypes or even create rapid prototypes.
In this manner Boeing was able to the 777 jetliner. This level of engineering would be impossible without CAD.Your company may not do a lot of 3D work, but it is still a good skill to have and it's also more fun than 2D.You'll be learning the 3-D concepts in the following order:Isometric Drawings (not true 3D)Wire-frame (very basic 3D)Surfaces / Regions (primitive 3D)Solid Objects (advanced 3D)You will have a chance to draw the same object different ways to see the differences between the various methods.Before entering the exciting world of 3-D, you'll have to learn some more CAD terminology.
This level presumes that you have a good understanding of 2D commands.3-D CAD TERMINOLOGY2-DA concept of displaying real-world objects on a flat surface showing only height and width. This system uses only the X and Y axes.3-DA way of displaying real-world object in a more natural way by adding depth to the height and width.
Autocad Sample Drawings Dwg Files
This system uses the X Y and Z axes.Commands that allow you to add, subtract or intersect solid objects in AutoCAD.Complex surfaceGenerally a curved surface. Examples: car fender, landscape contour.ElevationThe difference between an object being at zero on the Z-axis and the height that it is above zero.ExtrudeThe extrude command raises the shape of a 2D outline into a 3D solid. For example, a circle would be extruded into a cylinder.FaceThe simplest true 3-D surface.FacetA three or four sided polygon that represents a piece (or section) of a 3-D surface.Hidden line removalA way of hiding lines that would not be visible if you were viewing the actual object you have drawn in AutoCAD. (Command: HIDE)A simple way of achieving a '3-D' appearance using 2-D drawing methods.Plan ViewAlso known as the top view, a plan view looks directly down the WCS Z-axis to the X-Y axis.A basic solid building block. Examples would be boxes, cones, cylinders.A 2-D area consisting of lines, arcs, etc.A complex way of adding photo-realistic qualities to a 3-D model you have created.ShadingA quick way of adding color to a 3-D object you have drawn.
(Command: SHADE)Solid ModelA 3-D model creating using solid 'building blocks'. This is the most accurate way of representing real-world objects in CAD.Surface ModelA 3-D model defined by surfaces. The surface consists of polygons. (See facets.)A property of lines and other objects that gives them a 3-D like appearance.The user co-ordinate system. This is defined by the person drawing to have easier access to portions of a 3-D model.A particular view of the object you have created.A window into your drawing showing a particular view. You can have several viewports on your screen. Different from the viewports used in plotting.A 3-D shape that is defined by lines and curves.
A skeletal representation. Hidden line removal is not possible with this model.The third axis that defines the depth. As computers and software get more powerful, working in 3D becomes more popular. You have more power in desktop machine today, than was dreamed of when CAD first appeared. Be prepared that you will likely need to learn 3D at some point in your career.
Once you are comfortable working in 3D, you'll find that you will rarely want to draw in 2D again. Autodesk (the makers of AutoCAD) make other products designed specifically for certain disciplines -, and more. Depending upon your budget and needs, you may need to look into programs like these.
The concepts taught in these lessons will aid you when you work in any 3D program.Reference: Have a look at some before you start in this new world.
Here is the object in 3D along with its 2D drawing which we will learn to model in this post. I recommend you to switch to drafting and annotation workspace for this drawing, you can also download CAD files for this.Related:Step 1Create the following circles using CIRCLE command from draw panel of home tab, make sure circle with radius 2.5 units has its center on the circumference of the circle with radius 26 units.Step 2Select Polar Array from the Modify panel of Home tab and select two small circles on the top of geometry. Now specify the center of the largest circle as the center of the array and enter 4 in the Number of Items field. You will get an array like the one shown in the image below.Step 3Delete the biggest circle and select FILLET command now enter R on the command line and type 7 as the fillet radius. Now apply this fillet at the intersections of the circle with R2.5 and R22.5 as shown in the image below.Step 4Trim all the geometries to make it look like the image below.Step 5Type J on the command line and press enter then select complete geometry and press enter again.
This will join all external 2D segments into a single unit. You may need to repeat the JOIN command couple of times to join the geometry completely. Step 6Change view to southwest isometric and visual style to Shaded from Views and Visual styles panel of Visualize tab. Step 7Type PRESSPULL on the command line and click at a location inside the geometry, make sure you are clicking inside the geometry and not on the geometry. Enter the height of 3 units on the command line and press Enter again.This command will add the thickness of 3 units to the 2D geometry which we have made so far and your drawing will look like the image shown above.
Step 8Create a circle of R17 on the top of the object made in previous step, but for making a circle on top plane you need to make sure that dynamic UCS is turned on. Press F6 to turn on dynamic UCS then select circle command and move your cursor to the top plane and click at the center of geometry for circle’s center and enter a radius of 17 units and press Enter again.Step 9Type EXT on the command line and press enter then select the circle we have drawn in previous step and press enter again. Enter a height of 5.5 units and press enter again to exit the extrude command.Step 10Now create another circle of radius 14 units with the same center on top of geometry which we have drawn in the previous step and extrude it by 3.5 units the same way we did previously.Step 11Now type UNION and Press ENTER then select complete geometry and press enter again, this will ensure that all geometries get combined as a single unit.
Step 12Create a circle of R11 on the top most surface of the geometry. Now type PRESSPULL on the command line and press Enter then click inside the circle of radius 11 units and enter -12 as depth of geometry, this will make a hole in existing geometry.Step 13Type F on the command line and press enter to start fillet command, type R on the command line and enter a radius of 1.5 units for the fillet. Now select the edge between the flat piece and the biggest cylinder as shown in the image below and press enter twice to exit the command.The final geometry will look like the image shown above.
Hope you enjoyed this tutorial if you have any questions regarding this tutorial let me know in the comments below.This is a guest post by Andreea from, you can share as well.