Kristin Miller and Yee ho song checked the Polly IV underwater and found that the switch was not properly waterproofed. They decided to change the switch and make it waterproof using silicon. They went to Mood Fabrics to by the fabric to use as skin for Polly IV. They drew and cut the tail part using 0.03 PETG. They started attaching the skin to the Polly IV's hull.
Kristin Miller Yee ho Song and assembled Polly IV's electronics in place and ground tested the system. They videoed the test in the 7th floor hallway. They decided to use the surviving servo from the waterproof test for the Polly IV. They also reinforced epoxy-hardened waterproof wire holes with Black RTV Instant Silicon Gasket. They also waterproofed the switch.
Kristin Miller and Yee ho Song checked if the servos were motor proof.They also checked that the holes they made in the waterproof bags for wires did not deteriorate the bags' waterproof capability. They also made two extra wire holes to install external switch.
Kristin Miller and Yee ho Song went to mood to get fabrics for Polly IV. They got sample materials for Polly's gill fins(side fins). The silver scale fabric that they have decided to use for Polly IV was out of stock. They decided it to come back later next week after the material has been delivered to the store. They also checked other fabric store for the material but was not successful. They went to hardware store to buy o-ring for the new servos they bought yesterday. They cut holes in the waterproof bags for wires and waterproofed it using epoxy. They also tested waterproofing the new servos, with one using epoxy, mineral oil, and o-ring while the other one using o-ring and epoxy.
Kristin Miller and Yee ho Song finished the assembly of Polly IV. They placed the electronics compartment into the fish and tested the motor in water. It was found to swim at a rate of 3 inches per second. They also tested the turning ability of Polly and found it to be successful. The rest of the electronics was not hooked up, but the motor ran very successfully. Mike Bambino and Moishe Hamaoui met with them to discuss further progress.
Kristin Miller and Yee ho Song laser cut the pieces for Polly IV and manually cut the tail piece in the machine shop. They bought two additional servo motors at Radio Shack to be used for more waterproof testing. They began the assembly of Polly IV.
Kristin Miller and Yee ho Song continued testing of the waterproofing methods for the servo. A servo motor was placed in water and found to be waterproof, however it no longer had the ability. This is presumed to be because of the mineral oil that possibly melted the O-ring inside the servo (This assumption is based upon the experience using syringes to inject mineral oil into the gear compartment. The mineral oil caused the rubber part of the plunger to become sticky.). The plastic bag with the wire holes in it was found to be functional. A trip was made to Radio Shack at 781 Broadway to purchase some new servos to be used for further testing of waterproofing methods. The store was closed, so another attempt will be made.
Kristin Miller and Yee ho Song searched for and bought materials for waterproofing the servo. They tested the waterproofing method on 2 servos. They assembled the underwater motor and tested it. They also tested waterproofing wire holes in a plastic bag.
Kristin Miller and Yee ho Song searched for waterproofing materials as an alternative to the waterproof bags that are expected to arrive late. They found a waterproof epoxy, but decided to check the Cooper Union supplies before buying. They secured and cleaned a large tub to be used for testing and the final presentation. They also got some canvas scrap material to determine the sewing pattern for the fish “skin”. They did waterproof testing of one alternative method. They began work on the Power Point presentation for the final. They also bought googly eyes for aesthetic purposes.
Kristin Miller and Yee ho Song met to determine the size of the servo motor, the propulsion motor, and the sizing of the electronics compartment. They also determined the method to be used for waterproofing the electronics. Parts were ordered for the final design.
Kristin Miller and Yee ho Song tested the Polly III's Search and Control program by using Polly III's hull connected to servo and Arduino.