This week we finished the CAD and drawings for our most critical module, our Arm / Wall. After going over our work with Sei Jin it is clear that we have to fix up a couple of our drawings. This includes modifying some small measurement errors so that the side panels fit within our upper arm (the 1" x 1" square hollow aluminum tube), adding some needed dimensions, and getting rid of unneeded views.
As for our design, there were a couple areas of concern brought up during our meeting. First of all the belt will be off center in the arena. We need to make sure that the belt hits the center of the ping pong balls to move them out of the way; however I am not too sure how much it would hurt us if we pushed the ping pong balls at an angle because they would bank off the walls and go forward. We should definitely try to fix it if possible. We have to weigh out the possibilities of driving the belt another way and somehow adjusting the belt so that it would be centered between the walls.
Next, was the issue brought upon by the wheels being too large thus blocking the balls from getting to the belt. This was an easy fix: we will mount a small rounded delrin piece to the bottom of each side panel. With the low friction qualities of this material, it will help the arm glide along the bottom of the arena.
Lastly, Sei Jin was concerned with the difficulty of machining the female threaded 'axle' for the lower conveyor wheel. One easy fix would be to use a shoulder screw. These screws would allow the bearings in the wheel to roll freely on the shoulder. It wouldn’t be too large of an investment and would save us a lot of time in the shop. Here is a link to the shoulder screw we are thinking of.
http://www.mcmaster.com/#91259a539/=4f3tjr
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