I have read many discussions on forming tonnages, yet it still makes no sense to me. I've heard about numerous variables-tool load, tonnage per foot, tonnage per inch, centerline limits, even "sink" tonnage. Which one is the right one forme to use? Should I be using more than one of these values? Like many aspects of the sheet metal trade, the terms can be confusing, how they are applied can be confusing, and the worst part, not understanding how tonnage is calculated and applied can lead to some disastrous consequences. I and many others have written articles discussing tonnage and its many aspects. But I have not found one that puts all those aspects together, which ultimately would have answered your question. So here are all those variables, in order of progression, all in one place.
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