Murlin Trebuchet Case Study

Robert Sitbon
5/9/2014

Murlin Trebuchet Case Studies

Summary

 

The murlin trebuchet works by having a fulcrum surrounded by nodes of varying sizes. The counterweight has a string that is rapped around the outside of these nodes that is then attached to a point at the bottom of the apparatus. The sling is attached to the longest node so when the counterweight is released the fulcrum is spun launching the projectile using the energy built up within the string.
I chose the merlin trebuchet because it looked the coolest of the three choices. Also is looked the most unique with the spinning apparatus at the center.

Case Study #1


 
Positive:
1.  It shows the dimensions.
2. Has plenty of images and diagrams.
3. Has the blueprints of the spinning part.

Negatives:
1. It's dimensions are in Meters not feet.

Url: http://prezi.com/lpxzueiilmh2/murlin-trebuchet/

Case Study #2

Positive:
1. this site shows a step-by-step pictorial of how this guy built his trebuchet.
2. Has plenty of images
3. Shows the materials used

Negative:
1. Doesn't contain dimensions.

Url: http://www.behance.net/gallery/The-Murlin-Trebuchet/10601767

 

 

Sumobot Summary

 

Robert Sitbon

5/5/2014

Summary

 



This project's requirements were that we had to create a robotic car that was able to move and turn corners. When making our robot we chose to make a long body, but unlike the others we chose to have our wheels farther away from the body. We chose to do this originally so that we can make more space on the chassis, but later in testing it showed that this change gave us a wider and more accurate turning radius. We also chose the spots for the brain and the battery pack so that the weight is evenly distributed along the whole body. So that there would be enough weight on the wheels and motors, but not too much that it would weigh the wheels down and make them move too slow.

Result

 

The results of the time trial for my group was that we had the fastest time with 0:51 seconds. I believe our robot was the fastest because we have a small-to-medium gear ratio giving us more speed with the sacrifice of some torque. Also an advantage we had over the others was that we had an easy time making turns since we had a larger wheel ratio giving us the ability to make sharper and more accurate turns.

 

Analysis

 

What I would change on my robot would be fixing the alignment of the wheels since we had a problem with the left wheel wanting to turn to the left, even though this gave us an advantage with turning. Another thing I would change would be the front of the robot. I would make it pointy so that it wouldn't be as blunt and it would reduce air friction when moving.    



Fastener project

Fastener Project

Summery

The point of this lab was to explore creative and innovative ways to use different types of fasteners to build unique structures. For this project our goal was to great a standing project using 3 to 7 pieces of wood then cutting the wood to specific sizes then fastening them with each teams specific fastener.




Results

I feel we were close to achieving our design goal, but our design seemed to get less towards our goal near the end of the designing phase. When we were designing we wanted to make a step based statue that had rhythm, but it had trouble standing. Then we settled with a statue that had the step pattern we began with but it joined together at the top. We had some of the rhythm from our last design but it wasn't like it.

Analysis

  The most successful groups were the groups that used dowels and magnets. These groups were successful because the statues showed balance and rhythm. The one that used the dowels had rhythm through repetition of shapes. While the team that had magnets had great creativity by making a man since we can connect with it. 

Compound Machine

 

Build a Compound Machine

 

 

Summary

 



 

What we did in this project is we combined our simple machines to create a complex machine. my group combined our lever, wheel and axle, and our pully to create a super machine. The reason we did this project was so we can achieve the highest IMA possible. We were alowed to use any way to increase the IMA.

 

 

 

Results

 

 

Our machine was successful in testing, we managed to achieve an IMA of 92. Then we changed how on our wheel and axle the string wrapped the dowl rod. we moved some parts and let the string rad around a larger area of the rod so that it was getting the right thickness of the rod. After we did this change we tested it again and it changed the IMA to 130. Compared to the other groups, our group did average to the others.

 

 

Analysis

 

 

What I learned from this project was the aspects of the machines that affect this IMA the most. Some diffcutlt concepts to grasp were the placements of some of the machines. Nothng during this project really suprised me. I could apply this to a future project by using some of the tricks we used in this project in a future one.