Week 9

This is the final week to finish up the project. We are going to modify the carrier one last time and have ordered the parts to do so. The proposed design is as follows:

The new pieces are the crosses and the middle bar in the center to firstly, stabilize the piece, and secondly, to pass the chord through to create a triangle support from the bottom all the way to the top of the carrier. Modifications will begin shortly in the physical model. 

Week 8

During week 8 we tested our new design and got some statistics.  We do not have a specific type of sack to be put on the carrier so we had to improvise and use what was available in the room. We got some good data using a normal scale and some cushions and a backpack. We got the new dimensions for the new design and they are as follows:

Table 4. List of number parts and their frequencies

Length	Number of Parts
28 inches	2
16 inches	2
14 inches	3
9 inches	2

The data we collected is as follows:

Table 5. Data Collected to Determine Failure Weight

Group Member alone	136.8 lbs
Group Member + Frame	142.0 lbs
Frame alone (difference)	5.2 lbs
Group Member + Frame + Added Weight	162.8 lbs
Average Weight Held to Failure without Glue:	~ 20 lbs.

This updated carrier made the wearer able to balance themselves more easily and efficiently. It is similar to the method the Thai people were using before and may possibly be better received by their culture since it is less of a dramatic change. 

The carrier continues to slip out of its joints because we have not acquired the PVC glue yet. On Wednesday of Week 8 we plan to officially attach all the PVC pipes so that way more reliable and accurate testing can occur. We plan to test weight on the carrier going up stairs, up steep hills, and attaching it to the other transportation lab group's conveyor belt/pulley system. They ordered a metal hook similar to what would be found on a backpack. We plan to put a bar across the top in order to drill two holes for the hook to go through to carry the carrier on the pulley system.

Week 7

The PVC was cut and assembled. This is an image of the prototype as originally planned.

After curiosity and playing with the pieces, a new design was stumbled upon shown in the next image.

Testing will be done on both of these designs to determine which structure can support the most weight and which structure has the least amount of pain for the same amount of weight. That structure will be the final design, hopefully carrying an optimal weight for the least amount of pain as possible.

Week 6

After analyzing the materials at hand, before it was time to build the group made detail measurements for each piece. Our break down of cut PVC parts became:

9 in. x 2

14 in. x 2

16 in. x 3

28 in. x 2

A detailed Creo Parametric 3D Model of the carrier was created based on these sizes to visualize the prototype before it was cut. 

The cutting and assembly of the PVC will occur next week. 

Week 5

All the supplies to start building this prototype have arrived.

Our materials include:

• 1 in. x 10 ft. PVC pipe
• 2 of them @ $3.75 each
• 1 in. PVC T-Socket
• 2 of them @ $0.77 each
• 1 in. PVC L Joint
• 6 of them @ $0.58 each
• 50 ft. Paracord 
• 550 lb strength
• 1 for $7.99
• Pelican 3 piece Foam Set
• 8.2 x 3.6 x 5.7 in.
• 1 for $8.29

Building will commence in the following weeks. We believe that it is more important to measure twice and cut once so we will wait a few more days until our design is solidified. 

In the meantime, a miniature model was made to have a general idea of our prototype out of K'Nex pieces.

After this miniature model was built, a full sized one made out of K'Nex pieces as well was created.

Due to the lack of material for straps, it was placed onto the body in various ways in order to let creative ideas flow naturally. Brief testing will be done on this model in order to ensure that the PVC prototype will be exactly how it is intended to be. 

The K'Nex model is 38" tall, 16" wide and 14" long. These dimensions are approximately the dimensions we would like to use on our PVC prototype. 

We also gathered our materials this week and started brainstorming the best way to use each material.

Here are some examples of our K'Nex model in testing. We tried placing foam in varying locations as well as trying various types and thickness of the foam.