Use Object Snaps
 
 
 
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Use object snaps to specify precise locations on objects. For example, you can use an object snap to draw a line to the center of a circle or to the midpoint of a polyline segment.

You can specify an object snap whenever you are prompted for a point. By default, a marker and a tooltip are displayed when you move the cursor over an object snap location on an object. This feature, called AutoSnap, provides a visual clue that indicates which object snaps are in effect.

For a list of object snaps, see OSNAP.

Specify an Object Snap

To specify an object snap at a prompt for a point, you can

When you specify an object snap at a prompt for a point, the object snap stays in effect only for the next point that you specify.

NoteObject snaps work only when you are prompted for a point. If you try to use an object snap at the Command prompt, an error message is displayed.

Use Running Object Snaps

If you need to use one or more object snaps repeatedly, you can turn on running object snaps. For example, you might set Center as a running object snap if you need to connect the centers of a series of circles with a line.

You can specify one or more running object snaps on the Object Snaps tab in the Drafting Settings dialog box, which is accessible from the Tools menu. If several running object snaps are on, more than one object snap may be eligible at a given location. Press Tab to cycle through the possibilities before you specify the point.

Click the OSNAP button on the status bar or press F3 to turn running object snaps on and off.

NoteIf you want object snaps to ignore hatch objects, set the OSOPTIONS system variable to 1.
Procedure
To snap to a geometric point on an object
To set running object snaps
To turn on and turn off running object snaps as you work
To set object snaps to ignore hatch objects
Quick Reference
Commands
System Variables
Command Modifiers