How Do I Join Two Corner Lines in Autocad?

To join two lines, polylines, splines, or arcs that meet end-to-end in AutoCAD, including those forming a corner, you typically use the PEDIT (Edit Polyline) command and its Join option. This process converts the selected objects into a single polyline.

Here's how to do it:

Using the PEDIT Command

Joining lines that form a corner allows you to create a single polyline entity, which is useful for various tasks such as calculating areas, offsetting boundaries, or applying a consistent linetype to the entire segment. The lines must touch exactly at their endpoints to be joined.

Here are the steps, incorporating the method from the reference:

1. Start the command:

   • Click the Home tab on the ribbon.
   • Go to the Modify panel.
   • Find and click the Edit Polyline command icon. (You can also type PEDIT in the command line and press Enter).

2. Select the first object:

   • Select one of the lines, polylines, splines, or arcs that you want to join. If you select a simple Line, Arc, or Spline, AutoCAD will ask if you want to turn it into a polyline. You should confirm this by typing Y and pressing Enter.

3. Choose the Join option:

   • After selecting the first object and potentially converting it, type J (for Join) in the command line and press Enter.

4. Select objects to join:

   • Select the other lines, polylines, splines, or arcs that are located end to end with the first selected object. You can select multiple objects at once.

5. Complete the command:

   • Press Enter again to finish selecting objects and execute the join operation.
   • Press Enter one more time to exit the PEDIT command.

Your selected objects, including the two corner lines, should now be combined into a single polyline.

Step-by-Step Summary

Step	Action	Command/Option
1. Start Command	Click Edit Polyline icon	PEDIT
2. Select Object	Select initial Line/Polyline	Select object
3. Choose Option	Type Join option	J
4. Select Objects	Select objects to join	Select objects
5. Finish	Press Enter (twice)	Enter

Important Considerations

• End-to-End: The objects must meet precisely at their endpoints. If there are gaps or overlaps, the Join command will not work for those segments.
• Polyline Conversion: Simple Lines and Arcs will be converted into a polyline during this process.
• Result Type: The result of the join operation is always a polyline.
• Alternative: The JOIN command (simply type JOIN and press Enter) can also be used in newer versions of AutoCAD. This command often automatically converts lines/arcs to a polyline and joins them without needing the intermediate PEDIT steps, provided they are collinear or meet at endpoints. However, the reference specifically describes the PEDIT method.

This method effectively transforms separate line segments meeting at a corner into one continuous polyline object.