Week 9 (11/6/2017 - 11/12/2017)

In this week, we met twice to work on the Deliverable 5_b and to do the shakedown test.

• The first meeting was on Tuesday (11/7/2017) and at that time we brainstormed ideas for the Deliverable 5_b. The pictures below show the ideas that we brainstormed:

• The second meeting was on Friday (11/10/2017) and we created the prototypes and then after did the shakedown test.
• We first drilled the circle wood that was supposed to rotate and to hold the weight
• Then after we used the screws to attach a double squared metal (with a circular hole inside) to the circular wood. The double squared metal is supposed to attach the circular wood to a rectangular base wood, and it has ball bearing around the circumference of its circular hole which allows the circular wood to rotate about the base. After attaching the double squared metal to the circular wood, it looked like this: 

• After, we drilled the 3D printed mountain waved lobe. The mountain waved lobe was supposed to go on the top of the circular wood to make a shape similar to a donut shape.The first picture below shows how the mountain waved lobe looked like, and the second picture shows the way we drilled it.

• Next, we drilled the holes in the circular wood where we would enter the screws that would attach the mountain waved lobe to the circular wood.

• After, we went to Engineering shop at ABPK. Arriving there, we shaped well the hole in the mountain waved lobe, where the screw was supposed to enter.

• We smoothed out the bottom part of the mountain waved lobe to make it flat.
  

• We adjusted the size of the screws by cutting the extra length of them (they were too long) after we assembled the parts

• The final assembly of the rotating part looked like this

• Next, we drilled the rectangular base.

• We attached the base to the rotating part, and it looked like this:

• After, we taped it to smooth out the edge of the mountain waved lobe.

• After taping it, the part looked like this:

• Next, we came back to wet lab to do the shakedown test. We first added the soap on our rotating disk to make a lubricating layer.

• We took a clear bag, we added 9 bakers of water with each baker having 1000ml, we cut small pieces of a red post-it note and we added them to the water after we closed the bag. A picture of the setup is shown below:

• Below is a video that shows how the small pieces were distributed in the water before the shakedown test.

• We did the shakedown test by rotating the disk for one minute. We did 12 revolutions in one minute. The video of the distribution of the small pieces after the shakedown test is shown below:

• In total there were 50 lbs mass on to the top of the disk, which is approximately close to the upper body mass.