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AutoCAD Tutorial

AutoCAD 3D Modeling: Revolved Surface

August 6, 2003

The REVSURF command enables you to create a surface, based on the revolution of a curve about an axis. The curve can be a line, spline, polyline, arc, circle, ellipse, or elliptical arc. The SURFTAB1 and SURFTAB2 system variables control the number of divisions in the final 3D mesh.

Notes:

  • This tutorial is designed for AutoCAD 2004 though might be applicable for other releases.
  • In this tutorial user entries are in boldface.
  • The  8  symbol represents pressing Enter.

1. Download r16_rev_surf.dwg

Note: If you are using AutoCAD 2002 or an earlier release download r15_rev_surf.dwg

2. Open the drawing in AutoCAD. The drawing consists of a vertical line and a closed area built of lines and arcs [Figure 1].


Figure 1

3. Switch the shade mode to Gouraud Shaded, Edges On.

4. Alter the value of SURFTAB1 system variable to 36.

Command: surftab1 8

Enter new value for SURFTAB1 <6>: 368 

5. Invoke PEDIT.

6. Select one of the arcs. Enter Y and then press Enter to convert the arc to a polyline.

7. Select Join then select all the objects. The objects to the left are converted to a polyline.

8. Press Enter to end the PEDIT command.

9. Set the view to SE Isometric [Figure 2]:

Command: -view8

Enter an option [?/Orthographic/Delete/Restore/Save/Ucs/Window]: seiso8


Figure 2

10. Invoke REVSURF (Draw > Surfaces > Revolved Surface).

11. Select the polyline as the path curve and the line as the axis of revolution

12. The start and end angles of the revolved surface are 0 and 360 degrees respectively [Figure 3].


Figure 3

13. Erase the new 3D mesh.

14. Alter SURFTAB2 to 12.

15. Create the surface again. The quality of the surface is better now.



About the Author

Alireza Parsai is the founder of cadpanel.com. He is a mechanical engineer with more than 12 years experience with AutoCAD. Alireza is an Autodesk Authorized Author, the AutoCAD consultant for Al Khawarizmi Institute, a contributing editor for Augiworld magazine, a writer for CAD Digest, an instructor for AUGI Training Program, and an elected speaker for Autodesk University 2002. He has written 7 books in Farsi, 3 booklets in English, and more than 30 articles for different magazines and newsletters. You can reach him at alireza.parsai@cadpanel.com or visit his website www.cadpanel.com

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