https://www.youtube.com/watch?v=fdMlPE7_MJc

http://imfl.sci.pfu.edu.ru/forum/index.php?action=profile;area=summary;u=790672

Without the support board, the blade will certainly typically catch on the metal as well as distort it and also make it unusable. There's absolutely nothing wrong with using a great, old-fashioned hacksaw, yet