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K factor and flat pattern length

Question asked by Matthew Theakstone on Jan 17, 2016
Latest reply on Jan 21, 2016 by Bernie Daraz


Recently at worked we have started in house fabrication, as such our k factors need changing to suit our press brake. However, after doing test pieces the flat pattern length is still not correct. All flat lengths are correct for one bend but not multiple bends.


I modelled a part with 4 bends  and the flat length is 4mm too short. To gain this extra 4mm the k factor needs to be set to 0.7, does this seem right?  I thought k factor should be 0.25-0.5 due to extending ratio etc etc. I've never needed to calculate k factors, and attempted to use bend deductions but with little sucess, any advice