Chamfer

The chamfer command cuts a straight diagonal corner between two Line or Polyline entities. You specify how far back to cut along each entity (d1 and d2), and the command trims both entities to those points and inserts a connecting line between them.

Using equal distances produces a symmetric 45° cut; different distances produce an asymmetric bevel.

Chamfer works on Line and Polyline entities.

Using chamfer

1. Type chamfer in the terminal or click the Chamfer toolbar button.
2. Type the first chamfer distance (d1 — distance along the first entity) and press Enter.
3. Type the second chamfer distance (d2 — distance along the second entity) and press Enter.
4. Click the first entity — the portion you click determines which side of any intersection is kept.
5. Hover over the second entity — a dashed line preview shows the resulting chamfer cut. Move the cursor to the side you want to keep.
6. Click to apply. Both entities are trimmed and the chamfer line is inserted.

  Before (d1=5, d2=8):        After:

  ──────────────              ──────────╲
                │                        ╲────
                │

Side selection

When two lines cross each other, the chamfer is applied on the corner defined by the click positions — the portion of each entity on the same side as the cursor is kept.

• Click near one end of the first entity to select that half.
• Move the cursor to the desired half of the second entity — the dashed preview updates live.

For Polylines, the click position determines which segment of the polyline participates, and the nearest vertex on the intersection side is the one that gets trimmed.

What the command creates

• The first entity's endpoint (or polyline vertex) nearest to the intersection is moved to point T1, located d1 along the first entity from the intersection.
• The second entity's endpoint (or polyline vertex) nearest to the intersection is moved to point T2, located d2 along the second entity from the intersection.
• A new Line entity is inserted from T1 to T2.

The inserted line inherits the current lineweight, color, layer, and linetype settings.

Keyboard reference

Key	Action
0–9, .	Append digit to the current distance value
Backspace	Delete last typed character
Enter	Confirm the typed distance and advance
Escape	Cancel and reset

Supported entities

Entity	Supported
Line	Yes
Polyline / Rectangle	Yes
Arc, Circle, Ellipse	No
Text, Spline, Dimension, Leader	No

Chamfer vs Fillet

	Chamfer	Fillet
Corner type	Straight cut	Rounded arc
Input	Two distances (d1, d2)	One radius
Inserted entity	Line	Arc
Supported entities	Lines and Polylines	Lines only