Typically for the coil. We can produce with 12 fpi.But we want to increase the bending coil, density of fin for fpi to get 14 of coil between the deduction lieng bending.
Typically for general Coyle We can produce about 12 fpi coil bending but we want to increase the density of Dauphin for 14 fpi to avoid fracture of the coil during bending.