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The Auto Sword (Lazy Man's Sword)
The lazy man's sword is also called the "Auto Sword". It is a sword that swings all by itself. So it saves fatigue on your arm.
So, with this sword you can eat a sandwich and fight orcs at the same time. Makes things so much easier :)
This project also comes with a video. It is at the bottom of the page.
Will has a youtube channel with over 700 videos on projects you can make. Check it out right here
Overview: I am not sure how the idea came to me but it seemed like it would be a lot of fun. I doubt anything like this has been done before so I went ahead and made it. I also went through a few different iterations when trying to figure out the mechanism of this sword. And my first thought was some kind of cam mechanism. Want to learn more about the creative process behind this project? Check out The Creativity of it: The Lazy Man's Sword
Would you consider a donation of $1 to support my work? Paypal makes it very easy and safe. Click here to donate $1 - Every little bit helps Will to keep making great tutorials and projects. Thanks!
This is the exact little gear box motor that I purchase for this project. You build the gearbox and arrange the gears depending on the speed you want it to spin at. At the slower speeds you get more torque.
This battery box comes with a switch. So you don't have to purchase or use a separate switch.
Ok, let's take a look at the sword. And if you have watched the video you know that the blade of the sword moves up and down kind of in a hatchet type of motion.
This motion is achieved with a simple mechanism. It is a class 3 lever that converts the circular motion of the motor into a linear motion. Although it isn't a true linear motion. Lets take a closer look at the mechanism that does this.
The best way to understand this motion and this mechanism is to watch the video. It is only one minute long and shows this sword in action.
The dashed circle is where the motor is. As the motor spins it pushes the wooden arm forward and backward. And this pushes the blade in the back and forth motion.
In this picture the arm is pulled back all the way. It is on one end of its arc.
This picture shows the motor at the other end of its arc. Now you can see that the arm is pushed all the way forward. And this pushes the blade of the sword all the way in one direction. The motor will continue it's spinning and draw this whole thing back to the starting position.
One important point about this mechanism. In order for it to work properly you have to have the pivot point (fulcrum) of the mechanism in the same place as the pivot point for the sword inside.
This picture shows you what I mean. The wooden arm and the sword inside both pivot on the same point. This is an important thing when making this sword.
A rapier was a dueling sword from the 15th to 17th centuries and it is a great looking sword because of the intricate handle guard work. I have a template for you and you can make it with one sheet of foamboard. How to Make a Rapier
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Ok, You can watch the video below or 
