Group 1 2012 Gate 4

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Blabbity blab blab we put the piano back together an' shit.


Contents

Project Management

Cause for Corrective Action

The decision to decentralize the work involved in completing Gate 3 by assigning each group member a specific task and having no group meetings proved to be highly effective in minimizing the total amount of time spent on the project while still providing an acceptable degree of quality. Given the fractured and busied nature of everyone in the group's schedule during this project gate, we will continue to use this method to complete Gate 4.


Product Explanation

Product Reassembly

Chris, Sam, and I will finish this out, but for now just flip all the entries in this table.

In the end we need to answer these: How difficult is each step? How can you define a meaningful scale to rate the difficulty? How was the product originally assembled (by hand, robot, etc.)? Is the assembly the same as the disassembly?

# Step Description Tool Used Difficulty Rating
22 Pull sustain pedal bar out None 1-1-1 2012 Group 1 Picture 36.jpeg
The sustain pedal bar runs under the mutes. After the hinges are removed, the sustain pedal bar simply slides out from under the mutes.
Lifting up the very top panel of the piano exposes parts of the action and two hinges held on with screws that secure the top of the panel. Remove them to allow for easier access to the rest of the piano.
21 Unscrew the hinges of the sustain pedal bar Screwdriver 1-1-1 2012 Group 1 Picture 33.jpeg
These hinges are held by screws to the action bracket. Remove the screws and slide the hinges off the axles on the sustain pedal bar.
20 Unscrew the mutes above the hinges of the sustain pedal bar Screwdriver 1-3-3 2012 Group 1 Picture 32.jpeg
The metal sustain pedal bar runs behind all the mutes. Its hinges are also behind the mutes. To access the hinges of the sustain pedal bar, four mutes that cover the hinges' screws must be removed. Unscrew as in step 15.
19 Remove spring bar Screwdriver 2-1-3 2012 Group 1 Picture 29.jpeg
A bar with thin springs to return the hammers to rest position runs between the mutes and hammers. Remove the four screws that secure it and slide it out of the action.
18 Remove the una corda pedal bar None 2-1-2 2012 Group 1 Picture 30.jpeg
The una corda bar which runs behind the hammers pivots on the cast iron brackets in step 16. It is visible just above the bracket screws in the image at left. Once the brackets are loose, the una corda bar is free to drop from the action.
17 Unscrew the iron bracket on the end of the action Screwdriver 2-2-2 2012 Group 1 Picture 30.jpeg
The action’s structure is held together and attached to the piano body with cast iron brackets at its ends and center. This is also held on by screws that are removed with screwdrivers.

Mechanisms

"Your group must identify one or more mechanisms that your device uses to generate specific motion, control system behavior, modify/condition energy, etc"

They say we only need one. I don't believe them.

First Mechanism

  • Technical Name
  • Purpose
  • "how the mechanism works"
  • Equations governing the design of the mechanism


Design Revisions

Based on our analysis of the piano so far, and our understanding of the GSEE factors, three different revisions to the traditional piano could be made that would modify its design on the system level. These revisions would address issues that we identified.

First Revision

One of the issues with the piano is that it is too large and heavy. This limits its mobility, as well as places where it can be used. A solution to this would to reduce the number of keys in the piano itself. By cutting the number of keys in half, this would greatly reduce the size of the piano and its overall weight. This would increase its overall mobility, and its smaller footprint would allow the piano to be placed in more locations. Taking note of societal factors, the keys that would be eliminated would be those at the two extremes of the note range. This would make sure that the piano could still play a large number of piano compositions, that hover around the notes near middle C.

Second Revision

A second solution could also address the issue of the size, weight, and mobility of a traditional piano. Most of the current piano's size and weight come from the soundboard. With enough experimentation and research, the soundboard could be modified so that the same sounds could be produced, while changing the strings length, orientation, and tension. By doing this, the overall structure of the piano could be much smaller and significantly lighter. This could be beneficial to the consumer from an economic standpoint, since less material would be needed to make it so the price would go down. This also would take note of global factors, as the piano could now be moved around much easier and be played in places that it could not be done before.

Third Revision

Another issue with the full size piano, is that it is difficult for children and people with small hands to extend their fingers far enough to consistently play certain chords. The solution for this would be to integrate auxiliary keys to the original piano set up, that would hit the notes of the chord with a single depressed key. This takes into account societal factors by increasing the number of people that can learn to play the piano, even before their have grown to the ideal playing size, or if they never will.