Gate 2 - Group 6 2012
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Project Management: Preliminary Project Review
Table 1.1: Assessment of the Management Plan
|Management Roles||Goals||Successes||Challenges and Resolution|
|Project Manager and Intra-Group Communications Coordinator||
|Technical Expert: Communications Technology||
|Technical Experts: Dis-assembly Technicians||
Table 1.2: Assessment of the Work Plan
|Goals/Media Log||Successes||Challenges and Resolution|
Rotor, Hammer and Anvil
Trigger and Valve
Product Archaeology: Product Dissection
Step by Step Dissection of the Kobalt Pneumatic Impact Wrench
- Philips head screwdriver
- 5/32” Allen Wrench
- 6/62” punch
- 1/16” punch
- 13/16” wrench
- A vice (Not shown in diagram)
Removing/Dissecting the Trigger and Valves
First, remove the Bushing (1) on the bottom of the gun where the air hose is attached and requires a 13/16” wrench. NOTE: the Bushing may be difficult to start to unscrew so a vice may be used to start it. Then remove the Plastic Plate and Screw (2) with the screwdriver.
After those two are removed the inner parts should fall right out so care should be taken to not dump the contents. There are two parts that fall out and they are the Tipping Valve (3) and a Muffler (4).
Remove the Trigger (5A) by using the 6/62” Punch and hammer to slide out the Pin (5B) found next to the trigger in a little hole on the outside of the gun. The gun may need to be put in the vice to remove the pin. The Trigger (5A) will then pullout along with a spring in the trigger.
Removing/Dissecting the Back cover of the Impact Gun
Removing the Back Cover (6A) involves unscrewing the four Screws (6B) in the back with the 5/32” Allen Wrench.
Now the Back Cover (6A) needs to be separated into its components which require the cover to be clamped in a vice and the 1/16” punch and hammer are also needed. There is a small hole at the base of the Adjustment Lever (6C) where a Pin (6D) holds everything together. After using the punch and hammer to remove the pin simply pull apart the inner Adjustment Valve (6H) and the Adjustment Lever (6C).
Step 3 After that a Cork Gasket (6F) Rubber Washer (6G) and a Rubber Ring (6E) can also come off easily. NOTE: Be careful of taking apart the adjustment lever because there is a small Set Pin (6J) and Spring (6I) for a clear stop at different adjustments.
Removing the Rotor and Anvil for the Housing
Now the Back Bearing (7) is visible in the back of the housing. NOTE: be careful not to flip housing over or all the inner workings of the gun will fall out.
Remove the Back Bearing (7) and it will reveal the Rotor (8A) and Fins (8B).
Remove the Rotor (8A) and Fins (8B). The fins are not connected to anything and will fall out of the rotor when you pull it out.
Next remove the Outer Cylinder (9). It is not attached to anything but does fit fairly tight in the housing.
Next Remove the Front Bearing (10) by pulling it out.
Now the Anvil (11A) and Hammers (11B) can be seen in the front of the gun. To remove them place a hand over the back and flip the gun over. They should fall right out in your hand.
Now tip the whole Anvil and Hammer assembly up and the two Pins (11C) will fall out and then the Anvil (11A) will pull out allowing the Hammers (11B) to slide out and the only thing left is the Hammer Cover (11D).
Fully Dissected View
You Now Have a Dissected Kobalt Pneumatic Impact Wrench
Ease of Dissection
The difficulty of the removal of parts is rated on the scale:
- Very easy to take apart. Design was made well and user friendly.
- Dissection was reasonable. Could use improvements but not necessary
- Overall difficult for part/system. Could have been made easier.
- Extremely difficult for what the part/system is. Bad engineering design
|Part/System Removed||Difficulty Rating||Notes on Dissection|
|Valves||3||Received this rating due to the tightness of the connecting valve which is probably not meant to be taken off due to the need of pressure|
|Trigger||2||Did not receive a 4 due to the vice needed*|
|Back Plate/Regulator||2||Typical screw removal however regulator also had a pin*|
|Back Bearing||1||Came right off assembly|
|Rotor||1||Came out with ease|
|Front Bearing||1||Same as back bearing|
|Anvil||1||Anvil slid right out|
|Hammers||1||Big pins slid right out of anvil and after that the hammer comes right out|
- *Pins are not meant for the typical person to take out so are most likely not supposed to be removed
Connection of Subsystems
To see what subsystems are connected and how they are connected please see diagram below:
The subsystems are connected the way that they are so that they can influence each other in doing their required actions. The system of valves to allow the compressed air flow in turn allows the rotor to turn and change the energy to mechanical energy to turn the anvil and hammers which in turn increase the torque while the bearings allow all the parts to turn smoothly.
How the connections are implemented?
- Globally these systems are meant for areas that have the resources to be able to purchase and run an air compressor and power it.
- Societally these systems are set up for use in the US due to the fact that the tools needed to take it apart are in the English system.
- Economically these systems are made to be run cheaply due to the fact that it runs on air and the fact that the parts are made simply allowing easy mass production.
- Environmentally these systems are set up to leave no carbon footprint due to the fact that this run on air and that the majority of the parts are metal meaning that they can be recycled after its life is over.
Performance influences connection in this sense because if the torque was not needed then the anvil and hammers would not be necessary. The rotors working in turn with the anvil and hammers allows for the torque necessary to do its job.
The arrangement of subsystems can be seen in the diagram above.
- All the subsystems are placed where they are for a reason. Each part works in turn with each other for the final output. If specific parts are not together such as the rotor to the anvil and hammer working together to create high torque.
- Subsystems that cannot be adjacent are again the rotor, anvil, and hammers system. However, the trigger and valve system could be adjacent as long as the compressed air could come in and be regulated.