Trimming & Extending Lines (edgemode)

Have you ever wanted to trim a line to an apparent intersection? This allows you to quickly modify your drawing without adding extra construction lines. AutoCAD 2005 had this feature enabled by default (which is where I first used it), but 2006 seems to have disabled it. I wanted it back.

The system variable is called EDGEMODE and controls how AutoCAD determines cutting and boundary edges.

The following steps will turn this feature On:
(Extends or trims the selected object to an imaginary extension of the cutting or boundary edge)

  1. open any AutoCAD drawing
  2. type EDGEMODE and press enter
  3. type 1 and press enter
  4. This variable is saved in AutoCAD not the drawing file, so it will affect all other drawings opened on your computer.

The following steps will turn this feature Off:
(Uses the selected edge without an extensions)

  1. open any AutoCAD drawing
  2. type EDGEMODE and press enter
  3. type 0 and press enter
  4. This variable is saved in AutoCAD not the drawing file, so it will affect all other drawings opened on your computer.

Applies to: AutoCAD R12, 13, 14, 2000, 2000i, 2002, 2004, 2005 and 2006

Douglas R Seidler is the author of Digital Drawing for Designers: A Visual Guide to AutoCAD.

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