Tutorial Beginner ⏱ 8 minutes

Chamfered Corner Profile

Create a rectangle with 45° chamfered corners — the standard method for chamfered profiles in CNC milling.

What You Will Build

A 100×60mm rectangular profile with 10mm×10mm chamfers at all four corners. Common in engineering components where sharp corners are not permitted.

Operators Used

Rectangle/TL,BR Chamfer/Between,L,L Trim/L,to,L

Create Two Corner Points and Rectangle

Create the two diagonal corner points, then build the rectangle.

Point/0, 0, 0    → P0 = (0, 0)
Point/100, 60, 0 → P1 = (100, 60)

Rectangle/P0, P1
   Quick Input: P: 0  P2: 1
→ L0: bottom  (0,0)→(100,0)
→ L1: right   (100,0)→(100,60)
→ L2: top     (100,60)→(0,60)
→ L3: left    (0,60)→(0,0)

Create All Four Chamfers

Use Chamfer/L,L,D1,D2 to create each chamfer line. Specify equal setback distances D1=D2=10mm for 45° chamfers.

Chamfer/Between, L3, L0, D1=10, D2=10  → L4  [bottom-left]
Chamfer/Between, L0, L1, D1=10, D2=10  → L5  [bottom-right]
Chamfer/Between, L1, L2, D1=10, D2=10  → L6  [top-right]
Chamfer/Between, L2, L3, D1=10, D2=10  → L7  [top-left]

L4: from (0,10) to (10,0)   [bottom-left chamfer]
L5: from (90,0) to (100,10) [bottom-right chamfer]
L6: from (100,50) to (90,60)[top-right chamfer]
L7: from (10,60) to (0,50)  [top-left chamfer]

Chamfer lines are stored as Line entities (L-prefix). D1 and D2 are setback distances from the intersection along each line.

Trim the Bottom Line (L0)

Trim both ends of the bottom line to meet the chamfer lines.

Trim/L0, to, L4, Start  → L0 start moved to (10,0)
Trim/L0, to, L5, End    → L0 end moved to (90,0)

Trim the Right Line (L1)

Trim both ends of the right line to meet the chamfer lines.

Trim/L1, to, L5, Start  → L1 start moved to (100,10)
Trim/L1, to, L6, End    → L1 end moved to (100,50)

Trim the Top Line (L2)

Trim both ends of the top line to meet the chamfer lines.

Trim/L2, to, L6, Start  → L2 start moved to (90,60)
Trim/L2, to, L7, End    → L2 end moved to (10,60)

Trim the Left Line (L3)

Trim both ends of the left line to meet the chamfer lines.

Trim/L3, to, L7, Start  → L3 start moved to (0,50)
Trim/L3, to, L4, End    → L3 end moved to (0,10)

Final profile: 8 entities (4 lines + 4 chamfers)
All connected end-to-end. Ready for CAM.

Tips & Best Practices

Create all chamfers before trimming — same rule as fillets.
For a 45° chamfer, use equal D1 and D2 values.
For an asymmetric chamfer, use different D1 and D2 values.
Chamfer lines are stored as L-prefix entities — they behave exactly like any other line.
Use Measure → Entity Info to verify chamfer line start and end coordinates.