Bevels the edges of objects.
Access Methods
Button
Toolbar: Drafting tool set 
Modify tool group Chamfer Menu:
Modify
Chamfer
Summary
The distances and angles that you specify are applied in the order that you select the objects.
You can chamfer lines, polylines, rays, and xlines.
List of Prompts
The following prompts are displayed.
(TRIM mode) Current chamfer Dist1 = current, Dist2 = current
Select first line or [Undo/Polyline/Distance/Angle/Trim/mEthod/Multiple]: Use an object selection method or enter an option
First Line
Specifies the first of two edges required to define a 2D chamfer.
If you select lines or polylines, their lengths adjust to accommodate the chamfer line. You can hold down Shift while selecting the objects to override the current chamfer distances with a value of 0.
If the selected objects are line segments of a 2D polyline, they must be adjacent or separated by no more than one segment. If they're separated by another polyline segment, CHAMFER deletes the segment that separates them and replaces it with the chamfer.
Undo
Reverses the previous action in the command.
Polyline
Chamfers an entire 2D polyline.
The intersecting polyline segments are chamfered at each vertex of the polyline. Chamfers become new segments of the polyline.
If the polyline includes segments that are too short to accommodate the chamfer distance, those segments are not chamfered.
Distance
Sets the distance of the chamfer from the endpoint of the selected edge.
If you set both distances to zero, CHAMFER extends or trims the two lines so they end at the same point.
Angle
Sets the chamfer distances using a chamfer distance for the first line and an angle for the second line.
Trim
Controls whether CHAMFER trims the selected edges to the chamfer line endpoints.
If the TRIMMODE system variable is set to 1, CHAMFER trims the intersecting lines to the endpoints of the chamfer line. If the selected lines do not intersect, CHAMFER extends or trims them so that they do. If TRIMMODE is set to 0, the chamfer is created without trimming the selected lines.
Method
Controls whether CHAMFER uses two distances or a distance and an angle to create the chamfer.
Multiple
Chamfers the edges of more than one set of objects.