https://www.youtube.com/watch?v=OYhc5U_Ix_Q
this is my mechanical hacksaw that i use to cut big pieces of metal. this was built because cutting large pieces of metal with a chop saw sucks and blows, in that order... it is a 1/2 hp motor that turns a worm drive gear box which has the crank on the output shaft which actuates the blade frame that is mounted on ways on the main saw frame.. this is the same saw i used to cut the materials for my pneumatic press im currently building. it is cutting some aluminum plate in the video that will be used for the ends of another pneumatic cylinder for my press to kick the output force up another 1,200lbs for 3,200lbs of force at 135psi..