3D printed power hacksaw

[soofle616]

Interesting concept. You could probably improve cutting efficiency if you were to match the lengths of the pivot links better making the whole system closer to a parallelogram. As is there is a noticeable upswing in the cutting action so you're only utilizing a very small portion of the blade at any given time. Making the saw move in a more linear fashion would keep more of the blade in contact with the work yielding more cut per stroke (though that could result in excess torque requirements).

[CaptainObvious]

Interesting concept. You could probably improve cutting efficiency if you were to match the lengths of the pivot links better making the whole system closer to a parallelogram. As is there is a noticeable upswing in the cutting action so you're only utilizing a very small portion of the blade at any given time. Making the saw move in a more linear fashion would keep more of the blade in contact with the work yielding more cut per stroke (though that could result in excess torque requirements).

Actually that would be a bad thing, since you need a certain amount of pressure on the cutting surface for the saw teeth to dig in and remove material, if you make the cutting surface longer the pressure is distributed over a larger area so cutting efficiency drops.
On the second half of the video you can see it cutting along the length of the aluminium extrusion, that doesn't work well at all, I need to find a way to mount the work piece at an angle. When the extrusion was mounted at an angle (as in the beginning of the video) it cut it at a reasonable speed.
Alternatively I could mount the stock material higher, that would force the blade to pitch up and down as it moves back and forth, thus creating a very effective cutting motion.