add: image for die and cutout

Author: zihanW

wiki/fabrication/assets/sheet-metal-designing-001.jpg

@@ -27,6 +27,7 @@ With this background in mind, let's delve into the specific guidelines that are
 ## Bending Sheet Metal
 ### Clearance and Bend Order
 
+![Image](./assets/sheet-metal-designing-001.jpg)
 - **Die Clearance**: To make a bend without interference, a clearance of about 2 inches width at the bisecting angle of the die is necessary.
 - **Bend Sequence**: The order of bending matters significantly. Some series of bends may be impossible to fabricate due to tool interference.
 
@@ -37,8 +38,10 @@ With this background in mind, let's delve into the specific guidelines that are
 - **Material Curvature**: Material can curve outwards but not inwards on the bend line.
 
 ### Post-Bending Considerations
-
 - **Buckling**: Material buckles outward after bending, which can be mitigated by cutting a small slot for pieces that need to fit flush.
+
+![image](./assets/sheet-metal-designing-002.jpg)
+
 - **Bend Tolerance**: There is a tolerance of ±1/16 inch where the bend is made.
 
 ## Cutting Sheet Metal