The charts below show how the amount of springback increases as the IR/MT ratio increases. The calculator that we use here at Mate Precision Technologies was developed by “Bending Guru” Steve Benson and it can be downloaded free of charge at: They are not exact but they are a great tool to help select the correct press brake tools to be used. There are springback calculators available but experience has shown us that these calculators are best used to get a ballpark estimate of the final angle and radius. The challenge with excessive springback is that it is nearly impossible to accurately (within normal tolerance) predict what the final angle and radius will be. The larger the ratio between IR and MT the more the part will springback. When the bending force is removed from a large radius bend the part relaxes, the angle opens up, and the inside radius gets larger due to springback. Two challenges common to forming large radius bends are: Inside radius (IR) equal to or greater than eight times the material thickness (MT). What is large (or profound) radius bending? press brake tooling, large radius bending, springback, multi-breakage, advance bending.
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