Group 1 2012 Gate 3 - Revision history

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T18:23:59Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T18:23:03Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T18:22:22Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T18:20:01Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T18:19:02Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Design Revisions */

2012-12-14T12:00:00Z

Design Revisions

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T11:55:19Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Solid Modeled Assembly */

2012-12-14T11:48:11Z

Solid Modeled Assembly

MAE 277 2012 - Group 1: /* Product Analysis */

2012-12-14T11:44:38Z

Product Analysis

MAE 277 2012 - Group 1: /* Component Complexity */

2012-12-14T11:34:35Z

Component Complexity

@@ Line 377: / Line 377: @@
 We decided to model both the hammer and pull rod subsystems in order to better visualize the structure and basic interaction between the subsystems.  Autodesk Inventor Professional 2010 was used to model the components, due to members having multiple years of experience with the program. Since the hammer and action contain many parts, they were good candidates for an exploded assembly view as well. The parts were taken off the piano, measured with calipers and dimensioned in a rough sketch to allow the CAD modeller to quickly produce models.
-[[File:hammer-assembly.jpeg|border|frame|Fig. 2: Hammer assembly and exploded assembly views
+[[File:hammer-assembly.jpeg|border|center|frame|Fig. 2: Hammer assembly and exploded assembly views
 ]]
 <br clear=all>
 The hammer comprises 5 main components: The hammer head, the main shaft, the body, the loop, and the loop shaft. The loop allows a cloth strap to return the hammer to rest position when the key is released. The components are labeled below.
-[[File:hammer-diagram.png|border|frame|Fig 3: Hammer components.
+[[File:hammer-diagram.png|border|center|frame|Fig 3: Hammer components.]]
 ]]
-[[File:action-assembly.png|border|frame|Fig. 4: Pull rod subsystem assembly and exploded assembly views.
+[[File:action-assembly.png|border|center|frame|Fig. 4: Pull rod subsystem assembly and exploded assembly views.
 ]]
 The action subsystem connects to the keys by the pull-rod at left. The pull rod causes the body to pivot around the right pivot point. The hammer return pushes the hammer to a certain point, but then pivots out to allow the hammer to return to rest instead of dampening the string. Parts are labeled below.
-[[File:action-diagram.png|border|frame|Fig 5: Pull rod subsystem components.]]
+[[File:action-diagram.png|border|center|frame|Fig 5: Pull rod subsystem components.]]
-[[File:action-hammer-diagram.png|border|frame|Fig. 6: Pull rod and hammer subsystem orientation.]]
+[[File:action-hammer-diagram.png|center|border|frame|Fig. 6: Pull rod and hammer subsystem orientation.]]
 <br clear=all>

@@ Line 392: / Line 392: @@
 [[File:action-diagram.png|border|frame|Fig 5: Pull rod subsystem components.]]
-[[File:action-hammer-diagram.png|border|frame|Fig. 6: Pull rod and hammer subsystem orientation.
+[[File:action-hammer-diagram.png|border|frame|Fig. 6: Pull rod and hammer subsystem orientation.]]
-]]
+<br clear=all>
 === Engineering Analysis ===

@@ Line 377: / Line 377: @@
 We decided to model both the hammer and pull rod subsystems in order to better visualize the structure and basic interaction between the subsystems.  Autodesk Inventor Professional 2010 was used to model the components, due to members having multiple years of experience with the program. Since the hammer and action contain many parts, they were good candidates for an exploded assembly view as well. The parts were taken off the piano, measured with calipers and dimensioned in a rough sketch to allow the CAD modeller to quickly produce models.
 [[File:hammer-assembly.jpeg|border|frame|Fig. 2: Hammer assembly and exploded assembly views
 ]]
 <br clear=all>
 The hammer comprises 5 main components: The hammer head, the main shaft, the body, the loop, and the loop shaft. The loop allows a cloth strap to return the hammer to rest position when the key is released. The components are labeled below.

@@ Line 380: / Line 380: @@
 [[File:hammer-assembly.jpeg|border|frame|Fig. 2: Hammer assembly and exploded assembly views
 ]]
 The hammer comprises 5 main components: The hammer head, the main shaft, the body, the loop, and the loop shaft. The loop allows a cloth strap to return the hammer to rest position when the key is released. The components are labeled below.

@@ Line 378: / Line 378: @@
 We decided to model both the hammer and pull rod subsystems in order to better visualize the structure and basic interaction between the subsystems.  Autodesk Inventor Professional 2010 was used to model the components, due to members having multiple years of experience with the program. Since the hammer and action contain many parts, they were good candidates for an exploded assembly view as well. The parts were taken off the piano, measured with calipers and dimensioned in a rough sketch to allow the CAD modeller to quickly produce models.
-[[File:hammer-assembly.jpeg|order]]
+[[File:hammer-assembly.jpeg|border|frame|Fig. 2: Hammer assembly and exploded assembly views
-Fig. 2: Hammer assembly and exploded assembly views
+]]
 The hammer comprises 5 main components: The hammer head, the main shaft, the body, the loop, and the loop shaft. The loop allows a cloth strap to return the hammer to rest position when the key is released. The components are labeled below.
-[[File:hammer-diagram.png|border]]
+[[File:hammer-diagram.png|border|frame|Fig 3: Hammer components.
-Fig 3: Hammer components.
+]]
-[[File:action-assembly.png|border]]
+[[File:action-assembly.png|border|frame|Fig. 4: Pull rod subsystem assembly and exploded assembly views.
-Fig. 4: Pull rod subsystem assembly and exploded assembly views.
+]]
 The action subsystem connects to the keys by the pull-rod at left. The pull rod causes the body to pivot around the right pivot point. The hammer return pushes the hammer to a certain point, but then pivots out to allow the hammer to return to rest instead of dampening the string. Parts are labeled below.
-[[File:action-diagram.png|border]]
+[[File:action-diagram.png|border|frame|Fig 5: Pull rod subsystem components.]]
 Fig 5: Pull rod subsystem components.
-[[File:action-hammer-diagram.png|border]]
+[[File:action-hammer-diagram.png|border|frame|Fig. 6: Pull rod and hammer subsystem orientation.
-Fig. 6: Pull rod and hammer subsystem orientation.
+]]
 === Engineering Analysis ===

@@ Line 599: / Line 599: @@
 ====Soundboard====
-Our soundboard is composed of laminated planks of what is most likely spruce to improve sound projection of the piano. Spruce is generally considered to be acoustically the best material available, however, it is rather expensive. At the expense of sound quality, the cost of the piano could be decreased by replacing the material used in the soundboard with something cheaper and easier to produce, like plywood This would make the piano available to a wider societal demographic.
+Our soundboard is composed of laminated planks of what is most likely spruce to improve sound projection of the piano. Spruce is generally considered to be acoustically the best material available, however, it is rather expensive. At the expense of sound quality, the cost of the piano could be decreased by replacing the material used in the soundboard with something cheaper and easier to produce, like plywood This would make the piano available to a wider societal demographic. Additionally, the pine in plywood grows quickly, so it is easily renewable. This revision would also affect environmental design factors.
 ====Hammer and Action Bodies====
-Our piano has 88 sets of hammer and action bodies, all composed of glued together segments of drilled out wood. It would be much cheaper and faster to form all of those pieces out of plastic using injection molding. The economic benefits of this could then be transferred to the consumer.
+Our piano has 88 sets of hammer and action bodies, all composed of glued together segments of drilled out wood. It would be much cheaper and faster to form all of those pieces out of plastic using injection molding. Since the process is more automated, it requires lower operating costs, so this affects the economic factor.The economic benefits of this could then be transferred to the consumer.
 == References ==

@@ Line 164: / Line 164: @@
 '''Manufacturing Methods'''
-The keys are made of sawed wood with plastic laminated on top of them. The long and generally linear shape of the keys lend themselves to sawing.
+The keys are made of sawed wood with plastic laminated on top of them. The long and generally linear shape of the keys lend themselves to sawing. The choice of wood facilitates sawing to form the key shape inexpensively.
 ====Strings====
@@ Line 200: / Line 200: @@
 '''Manufacturing Methods'''
-The strings were made using a drawing process. Steel is a material that can be easily drawn into wire, and its is relatively easy to achieve the different lengths and thicknesses of the strings using this process.
+The strings were made using a drawing process. Steel is a material that can be easily drawn into wire, and its is relatively easy to achieve the different lengths and thicknesses of the strings using this process. Economically, long lengths of wire can be produced easily.
 ====Hammers====
@@ Line 236: / Line 236: @@
 '''Manufacturing Methods'''
-The hammers were sawed from wood.
+The hammers were sawed from wood. The various sawed parts are joined by glue. The repeated shape of the hammer may also allow a semi-automated assembly of the complete hammer from its various pieces. Environmentally, wood is renewable and easily disposed of. Economically, wood is cheaper to produce than other materials.
 ====Mute====
@@ Line 270: / Line 270: @@
 '''Manufacturing Methods'''
-The wooden pieces of the mute were made using a saw. This is apparent due to the material and the small complex cuts that could be done by hand. The metal portions were made from extruded metal stock formed to shape through pressure.
+The wooden pieces of the mute were made using a saw. This is apparent due to the material and the small complex cuts that could be done by hand. The metal portions were made from extruded metal stock formed to shape through pressure. The metal portion is deformable to allow maximum alignment with the string.
 ====Pedals====
@@ Line 304: / Line 304: @@
 '''Manufacturing Methods'''
-The pedal was manufactured using a casting process because its shape is irregular, and a mold could be easily filled with liquid brass to produce that shape with the strength needed for its application.
+The pedal was manufactured using a casting process because its shape is irregular, and a mold could be easily filled with liquid brass to produce that shape with the strength needed for its application. The primary factor affecting the pedals is economic, since the low-quality surface finish doesn't affect the pedals because they are out of sight, mostly.
 ====Frame====
@@ Line 338: / Line 338: @@
 '''Manufacturing Methods'''
-Because the frame is made of wood, all of its parts could be easily manufactured with simple wood cutting saw processes except for the legs that would require more complex carving due to their curved shape.
+Because the frame is made of wood, all of its parts could be easily manufactured with simple wood cutting saw processes except for the legs that would require more complex carving due to their curved shape. The legs were turned on a lathe. Societal factors govern the case because the style and finish are matters of a culture's fashion.
 ====Action End Brackets====
@@ Line 372: / Line 372: @@
 '''Manufacturing Methods'''
-Since the end brackets have such an irregular shape and they need to be strong, these components were made by casting iron.
+Since the end brackets have such an irregular shape and they need to be strong, these components were made by casting iron. Cast iron can be made cheaply for a given strength, so the primary factor governing the brackets is economic.
 === Solid Modeled Assembly ===

@@ Line 129: / Line 129: @@
 ====Component Complexity====
 The majority of the components of the piano are rather simple; most are just portions of levers or linkages. That said, there is a rough correlation between the number of fixed parts on a component and its complexity. We define a complexity scale such that:
-# Entire component is one solid body of one material.
+# Entire component is one single, solid body.
-# Entire component is one solid body composed of multiple different materials.
+# Entire component is one solid body composed of multiple different parts fixed rigidly and permanently.
-# Component is composed of one solid body with permanently attached moving parts.
+# Component is composed of one solid body with permanently attached moving parts such as hinges.
 ====Keys====