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Q&A: Why when you sew on thick material with a zig-zag machine does the thread tend to flag on the right side?

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http://bindingmachinesguide.com – Question by RoB: Why when you sew on thick material with a zig-zag machine does the thread tend to flag on the right side? I am a sewing machine mechanic and I run into all kinds of problems but these ZZ machines are tough to figure out ! First of all, our ZZ’s are set up with core edge folders and and we run material anywhere from 1/64 to 3/16 thick. Now combined with the binding thats pretty thick! The thicker the material the more the thread flags and skips on the right side. I know that putting pressure on the foot and rising the needle bar along with (General)