Posts Tagged ‘design’

So, I’ve been thinking about the catapult project in my Digital Fabrication class. I wrote the other day about my tweaks of the process and shared the image that I was using for my inspiration.

Here’s how my personal catapult is going. First I designed a new arm. I wanted to have just circles and lines and get rid of the bucket as the ping-pong ball (our projectile of choice) holder. Therefore, I made the arm from a series of circles that were the size that would hold let the ping-pong ball sit on them without falling through. Initially, I imagined that the lines/bars would have some function. However, it turned out I didn’t need them, so I broke them off, mostly. You can see the last bits of the bars as diameters in the circles, but the next version does not have them at all. The base incorporates the brick pattern and the circle. The first version flings the ping-pong ball just fine.

First I designed a new arm. I wanted to have just circles and lines and get rid of the bucket as the ping-pong ball (our projectile of choice) holder. Therefore, I made the arm from a series of circles that were the size that would hold let the ping-pong ball sit on them without falling through. Initially, I imagined that the lines/bars would have some function. However, it turned out I didn’t need them, so I broke them off, mostly. You can see the last bits of the bars as diameters in the circles, but the next version does not have them at all.

The base incorporates the brick pattern and the circle. It’s abstracted a little bit. Since the last row has an open portion, I can use that to hook up my rubber band as well. I can also put more tension on the rubber band by wrapping around a few rows, if need be. So handy.

The first version flings the ping-pong ball just fine.

When I looked at the catapult from the front, I noticed that the circle of the base and the first circle of the arm could line up better and maybe look like concentric circles if the arm circle is bigger. Turns out, I can get close, but because the arm is always on a bit of an angle, the circles of the base and the arm are never quite in the same plane. Still, I think it’s a design improvement.

Now what?

Since the catapultĀ flings the ping-pong ball fine, at this point it’s all about improving my design. Maybe some of the “brick” pattern that is in the base should go between or across the two middle circles in the arm? The final circle has to be hollow for the ball to sit there. Hmmm.