Hello,
I have probably trivial question, but need an advice from some skilled HVAC fabricator. I need to make standing pittsburgh seam on the part as per attachment - it is panel from T branch for ductwork. I need all marked edges to be about 8mm height standing seam, to fit into the female part. I have flanger (also picture attached to avoid misunderstanding) beading machine with many rolls, pan brake, pliers.... but I am not successful in the part, where two flanges should meet (red circle) - any skilled duct fabricator can advice how to proceed? I can somehow do the falnge, but the quality is very poor - there has to be some trick for this I think...