Air Cannon Kris Burns

Our goal for this project was to build an air cannon that could launch a tennis ball to play a game of battleship on the school football field. The basic requirements for our design was elevation and rotation. Elevation changes the angle in the Y axis. Rotation changes the angle in the X axis which will aid us in being able to launch the tennis ball through the use of our Arduino accurately. We will be testing the accuracy of our cannon on the football field by shooting at targets with knowing the distance the ball will need to travel.

10 second countdown using LED's, Diods, BreadBoard, and an Arduino.
Trying to get the relay to work which will open and close the valve on the cannon to release all of the air pressure built up.
3 led count down with a buzzer for countdown to lauch cannon

Our next problem that needed to be solved was to make supports to keep the cannon arms straight so they did not move around and snap any of the PVC.

This is the design of our support. The problem with this was the holes were designed with a 2 inch diameter which made them extremely hard to put on. After redesigning the holes we made them 2.1 which made them fit snug.
Almost done putting our box together

Our next step is to build our cannon.

Cutting the PVC to the correct lengths to build the cannon. A problem we had with this step was I was cutting on the wrong side of the line so we ended up with a smaller than we needed PVC so we had to deal with having smaller tubes then we were supposed to.
Using epoxy to glue the valve stem to the PVC so we can put air into the tank on the cannon, which failed later on as we did not put enough on so we had to scrape the old e[poxy off and put more on.
Our cannon after putting everything to together and putting the box on without the cap on the end of the barrel.

Our next goal is to design our base to rotate and elevate our cannon.

This is our design for our base which had some problems with the dimensions of the hole as we designed them to be exactly 2 inches which we had to sand all of the 2 inch holes down to the 2 inch PVC could fit.
The cut sheet after ShopBot was done as we are taking out the screws which held to board down to the Shopbot.
This is one of the pieces with holes drilled into the board for our rotation which we will use a wooden dowel to hold it in place against the top layer of wood. This also had a lot of problems. First off as we rotated it the screws were rubbing agains the wood which is why there is a circular line carved into the wood. Second off the holes that we drilled to help lock the rotation were drilled incorrectly because none of them lined up so they were pretty much useless.
This is the PVC which will be used to keep everything inline when it gets rotated. A problem with this is it is very hard to rotate the base because of how much friction there was between the PVC and the wood.
This is what it looks like with the PVC in the hole which the wood will rotate around.
This is one of the sides which has the pvc going threw all three pieces of wood, the angle marker and both A supports.
This is what we are using to mark our angles. There is a dowel holding it in place so the cannon does not move. Which is not as goood because there is slop in the hole a dowel.
This is the bottom part of the cannon put together with the dowel holding it in place as well. This has a problem which is there's space in the holes where the dowel rod sits which has created slop so our rotation is not as accurate as it would be if there wasn't any slop.
This is the final product after assembling all of the pieces to the cannon.

Finally the fun begins, we get to test our cannon.

This is our data from testing our cannon at 40 degrees at 75 PSI.
This is our data from testing our cannon at 50 degrees.
This is our data from testing our cannon at 60 degrees.
This is our peer review sheet. The scale is going from 1 to 4. 4 is being the best or highest and 1 being the lowest.

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