Close an arc to make a circle or ellipse; connect splines

Starting with AutoCAD 2006, you can use the JOIN command to join objects that are colinear, meaning that they’re along the same line. Usually, you use JOIN to join lines or polylines. For example, you may have broken a line and now you need it whole again. The command fills in gaps, if necessary.

You can also use the JOIN command to join arcs that are along the same circumference or elliptical arcs that are along the same elliptical circumference. Just select an arc or elliptical arc and use the cLose option.

You can even join splines, as long as they don’t have any gaps. Help says that you can join helixes, but this didn’t work for me. Perhaps the language in Help is misleading, because I was able to join a helix with a spline.

Here is the result in a Top view:

Even cooler, here it is in Souteast Isometric view:

• Author
• Recent Posts

Ellen Finkelstein

Ellen Finkelstein is the author of the best-selling AutoCAD & AutoCAD LT Bible, which started with R14. Ellen has written extensively on AutoCAD, including articles for Autodesk’s website and features for AutoCAD’s Help system. Ellen’s first book was AutoCAD For Dummies Quick Reference.

Latest posts by Ellen Finkelstein (see all)

• Combine or subtract 2D shapes to create custom shapes - February 17, 2022
• Working with linetype scales - January 18, 2022
• Rename named objects–blocks, dimension styles, layers, and more - December 21, 2021