I am DIY a simple mechanical device for an art project I am working on. A gif animation of the device can be seen as following http://m.uploadedit.com/b93/36854807.gif Basically I want the arms being able to move up and down as the circle disk spins. I also want the whole device to rotate clock-wisely every 90 degree angle (this is not shown in the gif animation, it requires 3d animation). It does not need to be very extremely actuate. The device should be about 16 inches tall. I am planning to use wood for most parts. I have searched servo motors and geneva mechanism motors. There are a ton of them to choose online. I am lost! since I do not know anything about mechanical design. Can anyone tell me in my case, what are the motors that will fit my design? (ie: their power? , price? etc.) Since I am DIYing, I would like the most cost effective motors. if there is something wrong with my design, or it can be simplified, please feel free to let me know. Thanks.