Sheetmetal > Designing in Sheetmetal Design > Bending, Unbending, Bending Back Walls > Unbending Walls > About Coordinate Systems Following Surfaces with Bends and Unbends
  
About Coordinate Systems Following Surfaces with Bends and Unbends
You can add a coordinate system to your design to mark the location of a feature. This coordinate system follows the sheet metal surface by default when you perform a bend or an unbend operation. Bending and unbending surfaces with coordinate systems rather than features reduces regeneration time.
Click and then place the coordinate system so that the origin lies on, and one axis is normal to, a sheet metal driving surface or an offset surface.
 
* If you do not want the coordinate system to follow the surface, clear the Follow surface check box on the Origin tab.
Adding a coordinate system that follows the sheet metal surface is useful, for example, when you plan on adding bends and unbends to a design that also includes punch forms or cuts. First add any coordinate systems to your sheet metal part to mark the punch form or cut locations. Then create any bends and unbends. At a later stage, add any punch forms or cuts to the sheet metal part, matching the coordinate system interface of the punch form to the sheet metal geometry.
For more information on coordinate systems, search the Help Center.