hi I just bent up a bunch of treads from perforated sheet and it was such a pain i set up for one measurement and it came up 3mm to small and it would over bend one time and then under bend them another time. How do I get round this?
There's virtually no way to make sure you bend on the same pitch position each time. Presuming your using a press brake set the stroke limit to the minimum so you don't over fold, then hit it again to get your bend angle as needed. A right pain in the rear but in the long run the quickest way of doing it.
Depending on thickness a tighter bottom tool than normal stops it slipping as much.