Power Hacksaw

26 September, 2017 | Videos


A very common machine capable of cutting metals is this week’s construction and it is called ‘power hacksaw’. Our version of ‘power hacksaw’ has not been applied any special modifications of the machines that already exist at the market. 

First, we started making our construction by creating its framework by metallic pieces of 12cm width and 6,5cm height. At this framework, we added the bases, on which we put a gear box taken from an old paper-cutting machine. The gear box’s role is to decrease the spins and increase the power of the motion transmission that leads to the slow and strong motion of the blade in order to reach the most desirable outcome of cutting the metallic materials. 

Moreover, to make the gear box move, we attached it with a dc motor 2hp taken from an old treadmill. Apart of its small size and its high power, another benefit of the dc motor is that using another device, we can fluctuate the speed of the motor and subsequently, the motion speed of the blade that is cutting our object at the particular time.
We can actually get advantage from this particularity as it gives us the opportunity to set the speed in accordance to the kind of metal. For example, for aluminium material we need faster speed compared to the iron that it needs slower speed and stainless steel which needs even slower speed.  

Additionally, using a 240v ac from our provision, we placed a regulator of volt and afterwards, passing the electricity over a bridge, we get dc electricity on our way out that powers our motor.  Therefore, while the motor is moving, the gearbox is moving and it is spinning in its exit, too.

However, to transform the spinning motion into a motion moving towards and backwards that is needed for the blade, we used a ribbon, which transfers the motion to the point where the blade is placed. Thus, the blade moves towards and backwards by using a linear bearing that is dragged towards and backwards on two motionless chromium-plated axis. At the front part of our construction, the making of a vice gives us the potential to hold the piece during its cutting. It can hold a piece up to 20cm width. 

Finally, to achieve a faster cutting, we made a basis exactly on the blade, where some kilos are placed so their weight puts pressure on the blade during the cutting process. As soon as the piece is cut, a limit switch deactivates the motor and the machine stops working, automatically. In this way, we managed to make the cutting process easier without being necessary to be there during the material’s cutting.

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