Group 4 - Computer DVD Drive - Revision history

UB08G04 at 17:17, 5 December 2008

2008-12-05T17:17:45Z

UB08G04 at 17:10, 5 December 2008

2008-12-05T17:10:51Z

UB08G04 at 16:58, 5 December 2008

2008-12-05T16:58:54Z

UB08G04 at 16:55, 5 December 2008

2008-12-05T16:55:27Z

UB08G04 at 16:44, 5 December 2008

2008-12-05T16:44:50Z

UB08G04 at 16:43, 5 December 2008

2008-12-05T16:43:31Z

UB08G04 at 16:42, 5 December 2008

2008-12-05T16:42:51Z

UB08G04 at 16:30, 5 December 2008

2008-12-05T16:30:53Z

UB08G04 at 15:07, 5 December 2008

2008-12-05T15:07:49Z

UB08G04 at 15:06, 5 December 2008

2008-12-05T15:06:49Z

@@ Line 577: / Line 577: @@
 <BR>
 '''Reflection Summary:'''
 *We did not dissect any of the complicated internal components such as the motors, red head, and computer chips. These have very small and fragile parts within them, which would make them very difficult to dissect.
 *Very little problems were encountered during the assembly and disassembly. Very small hex screws were hard to remove due to their small size. The emergency eject did not operate correctly but it proved to be an easy fix being a spring clip was just out of place. The last problem we encountered was plugging the ribbon wires back into the main computer chip, there is a small area to work in and requires precision.

← Older revision		Revision as of 17:10, 5 December 2008
Line 667:		Line 667:
	*Wikipedia (2008). Compact Disc. Wikipedia. Retrieved December 2nd, from http://en.wikipedia.org/wiki/Compact_Disc		*Wikipedia (2008). Compact Disc. Wikipedia. Retrieved December 2nd, from http://en.wikipedia.org/wiki/Compact_Disc

−	*	+	*(2008). CDRW Drive. Computer Resolutions. Retrieved December 1st, from http://www.computeresolutions.com/guide/cdrw.html

@@ Line 24: / Line 24: @@
 <BR>
-CD drives have become a crucial and effective way of storing and viewing data. CD's are upgrades from the floppy disc and much larger discs. The first CD-ROM drive was created and launched in 1990, since then the industry has not looked back. The read speed of the first    CD-ROM drive was 1x, present day drives can now read up to 52x. A typical CD can accept about 700MB of storage, this is equivalent to approximatley 500 or more floppy discs. CD drives may be connected to a computer through several interfaces such as ATA, SCSI, S-ATA, Firewire, or USB connections. Computer drives offer a simple exterior design that houses many well designed components. CD drives have been incorporated into society and have become essential to many situations.
+CD drives have become a crucial and effective way of storing and viewing data. CD's are upgrades from the floppy disc and much larger discs. The first CD-ROM drive was created and launched in 1990, since then the industry has not looked back. The read speed of the first    CD-ROM drive was 1x, present day drives can now read up to 52x. A typical CD can accept about 700MB of storage, this is equivalent to approximatley 550 or more floppy discs. CD drives may be connected to a computer through several interfaces such as ATA, SCSI, S-ATA, Firewire, or USB connections. Computer drives offer a simple exterior design that houses many well designed components. CD drives have been incorporated into society and have become essential to many situations.
 <BR>
@@ Line 666: / Line 666: @@
 *Wikipedia (2008). Compact Disc. Wikipedia. Retrieved December 2nd, from http://en.wikipedia.org/wiki/Compact_Disc

@@ Line 24: / Line 24: @@
 <BR>
-CD drives have become a crucial and effective way of storing and viewing data. CD's are upgrades from the floppy disc and much larger discs. The first CD-ROM drive was created and launched in 1990, since then the industry has not looked back. The read speed of the first    CD-ROM drive was 1x, present day drives can now read up to 52x. A typical CD has 650MB of storage, this is equivalent to over 450 floppy discs. Computer drives offer a simple exterior design that houses many well designed components. CD drives have been incorporated into society and have become essential to many situations.
+CD drives have become a crucial and effective way of storing and viewing data. CD's are upgrades from the floppy disc and much larger discs. The first CD-ROM drive was created and launched in 1990, since then the industry has not looked back. The read speed of the first    CD-ROM drive was 1x, present day drives can now read up to 52x. A typical CD can accept about 700MB of storage, this is equivalent to approximatley 500 or more floppy discs. CD drives may be connected to a computer through several interfaces such as ATA, SCSI, S-ATA, Firewire, or USB connections. Computer drives offer a simple exterior design that houses many well designed components. CD drives have been incorporated into society and have become essential to many situations.
 <BR>
@@ Line 660: / Line 660: @@
 *Sweet, M. (n.d.). How DVD Drives Work. Smart Computing. Retrieved October 20th, from http://www.smartcomputing.com/articles/archive/r0403/08r03/08r03.pdf

@@ Line 24: / Line 24: @@
 <BR>
-CD drives have become a crucial and effective way of storing and viewing data. CD's are upgrades from the floppy disc and much larger discs. The first CD-ROM drive was created and launched in 1990, since then the industry has not looked back. The read speed of the first    CD-ROM drive was 1x, nowadays drives can read up to 52x. A typical CD has 650MB of storage, this is equivalent to over 450 floppy discs. Computer drives offer a simple exterior design that houses many well designed components. CD drives have been incorporated into society and have become essential to many situations.
+CD drives have become a crucial and effective way of storing and viewing data. CD's are upgrades from the floppy disc and much larger discs. The first CD-ROM drive was created and launched in 1990, since then the industry has not looked back. The read speed of the first    CD-ROM drive was 1x, present day drives can now read up to 52x. A typical CD has 650MB of storage, this is equivalent to over 450 floppy discs. Computer drives offer a simple exterior design that houses many well designed components. CD drives have been incorporated into society and have become essential to many situations.
 <BR>

@@ Line 6: / Line 6: @@
 ==Executive Summary==
-The main focus of this product dissection was to fully disassemble a CD-R/RW drive typical of [[optical drives]] used today for reading the data on the ubiquitous CD. This particular device is intended to fit in the 5.25" drive bay of modern desktop computer towers. The procedure was to incorporate a complete product dissection including careful disassembly, component study, and  reassembly. The initial phase consisted of a complete tear-down of the product and photo-documentation. Subassemblies were numbered and placed in separate containers for later identification and ease of reassembly. Each component and subassembly was studied in order to better understand its function within the unit, and how it interacted with other components in order to perform the same overall function. Once inside, the intricacies and capabilities of modern electronics can be fully realized. The product itself is able to load a DVD disc into the tray, read it through the use of a [[laser]], convert the data into a signal readable by the computer in a package not much larger than the disc itself. After documenting a few crucial components in a 3-D CAD program the components were assembled back together. The process was straightforward and easy using only a small screwdriver and basic disassembly skills can completely remove almost all necessary components to study the product. As this was a base-model widely available device, and most certainly not intended for infinite life use, some of the components were not designed to withstand the forces necessary to disassemble it. These include many small plastic pieces and a small rubber belt that was missing upon delivery of the item.
+The main focus of this product dissection was to fully disassemble a CD-R/RW drive typical of [[optical drives]] used today for reading the data on the ubiquitous CD. This particular device is intended to fit in the 5.25" drive bay of modern desktop computer towers. The procedure was to incorporate a complete product dissection including careful disassembly, component study, and  reassembly. The initial phase consisted of a complete tear-down of the product and photo-documentation. Subassemblies were numbered and placed in separate containers for later identification and ease of reassembly. Each component and subassembly was studied in order to better understand its function within the unit, and how it interacted with other components in order to perform the same overall function. Once inside, the intricacies and capabilities of modern electronics can be fully realized. The product itself is able to load a disc into the tray, read it through the use of a [[laser]], convert the data into a signal readable by the computer in a package not much larger than the disc itself. After documenting a few crucial components in a 3-D CAD program the components were assembled back together. The process was straightforward and easy using only a small screwdriver and basic disassembly skills can completely remove almost all necessary components to study the product. As this was a base-model widely available device, and most certainly not intended for infinite life use, some of the components were not designed to withstand the forces necessary to disassemble it. These include many small plastic pieces and a small rubber belt that was missing upon delivery of the item.
 ==Introduction==

@@ Line 258: / Line 258: @@
 | align="center" | 1
 | align="center" | Metal
-| align="center" | blank
+| align="center" | Extrusion, Bent
 | align="center" | [[Image:MAE 277 Project 031.jpg|100px|Support Springs]]
 |-
@@ Line 299: / Line 299: @@
 | align="center" | Internal Frame
 | align="center" | 1
-| align="center" | blank
+| align="center" | plastic
 | align="center" | Injection Molding
 | align="center" | [[Image:MAE 277 Project 019.jpg|100px|Internal Frame]]

@@ Line 34: / Line 34: @@
 ===Group Members===
-All group members collaborated on the project and each had their own parts to work on.
+All group members collaborated equally on the project and each had their own parts to work on.
 *Bryan Humes - Group leader, 3D CAD, wikipage, oral presentation
 *Brian Maisch - 3D CAD, oral presentation, Video
@@ Line 574: / Line 574: @@
 <BR>
 '''Was assembly a mirror process of disassembly?'''
 *The reassembly process was not a mirror process, but very well could have been. There are several steps that can be interchanged with no reprocussions. We used the same sets of tools during reassembly as in disassembly.
 <BR>
-'''Assembly/Disassembly Summary:'''
+'''Reflection Summary:'''
-*In contrast, reassembly was very straightforward. Since we knew where all the pieces went, it was an easy reassembly. Altogether it took less than 40 minutes.
 *We did not dissect any of the complicated internal components such as the motors, red head, and computer chips. These have very small and fragile parts within them, which would make them very difficult to dissect.
 *Very little problems were encountered during the assembly and disassembly. Very small hex screws were hard to remove due to their small size. The emergency eject did not operate correctly but it proved to be an easy fix being a spring clip was just out of place. The last problem we encountered was plugging the ribbon wires back into the main computer chip, there is a small area to work in and requires precision.
-*The adjusting gear and eject pulley were placed in slots located on the top of the internal frame. The height adjustor was then installed and connected to the adjusting gear. The lift actuator was then placed in the groove located in the height adjustor . The spindle motor support was screwed back together including the spindle motor and support springs which in turn is connected to the lift actuator. The red head was then installed with its brackets and tracks. The disc tray was then slid back into place and finally the bottom plate along with the metal case where screwed back together to complete the reassembly.
+<BR>
@@ Line 646: / Line 651: @@
 ==References==
 *Elton, M. (2006). How DVD and CD Drives Work. Scribd. Retrieved October 10th, 2008, from  http://www.scribd.com/doc/596/How-DVD-and-CD-Drives-Work
 <BR>

@@ Line 506: / Line 506: @@
 |}
 <BR>
-The spindle motor is placed onto the support springs, the spindle motor support is the placed on the other side and all parts are fastened together.
+*The spindle motor is placed onto the support springs, the spindle motor support is the placed on the other side and all parts are fastened together.
 <BR>
 ==Assembly Procedure==

@@ Line 368: / Line 368: @@
 '''Sled Motor:'''
-This motor provides motion to the red head assembly, moving it at a constant rate as the disc spins.
+This motor provides motion to the red head, moving it at a constant rate as the disc spins.
 <BR>
@@ Line 380: / Line 380: @@
 '''Red Head Brackets:'''
-The brackets hold the red head tracks in place. The red head assembly can now move on its tracks.
+The brackets hold the red head tracks in place. The red head can now move on its tracks.
 <BR>
@@ Line 424: / Line 424: @@
 '''Eject Motor, Volume Control, Headphone Jack:'''
-The eject motor is responsible for ejecting and inserting the disc tray. The volume control is in the form of a wheel, it can be turned either way producing a louder or quieter sound. The headphone jack is a small opening in the front of the drive. A set of headphones can be plugged into the drive to isolate the sound to the headphones.
+The eject motor is responsible for ejecting and inserting the disc tray. The volume control is in the form of a wheel, it can be turned either way producing an increased or decreases level of volume. The headphone jack is a small opening in the front of the drive. A set of headphones can be plugged into the drive to isolate the sound to the headphones.
 <BR>
@@ Line 572: / Line 572: @@
 <BR>
 ===Reflection===
-'''Reflection on Assembly/Disassembly'''
+<BR>
 <BR>
 *The reassembly process was not a mirror process, but very well could have been. There are several steps that can be interchanged with no reprocussions. We used the same sets of tools during reassembly as in disassembly.
 *In contrast, reassembly was very straightforward. Since we knew where all the pieces went, it was an easy reassembly. Altogether it took less than 40 minutes.
 *We did not dissect any of the complicated internal components such as the motors, red head, and computer chips. These have very small and fragile parts within them, which would make them very difficult to dissect.
 *Very little problems were encountered during the assembly and disassembly. Very small hex screws were hard to remove due to their small size. The emergency eject did not operate correctly but it proved to be an easy fix being a spring clip was just out of place. The last problem we encountered was plugging the ribbon wires back into the main computer chip, there is a small area to work in and requires precision.
-<BR>
+*The adjusting gear and eject pulley were placed in slots located on the top of the internal frame. The height adjustor was then installed and connected to the adjusting gear. The lift actuator was then placed in the groove located in the height adjustor . The spindle motor support was screwed back together including the spindle motor and support springs which in turn is connected to the lift actuator. The red head was then installed with its brackets and tracks. The disc tray was then slid back into place and finally the bottom plate along with the metal case where screwed back together to complete the reassembly.
 ===How it Works===
 The [[CD-R\RW]] drive works in a general sense by converting electrical [[energy]] into mechanical energy. This mechanical energy is used first to load the disc tray into the frame, then to spin the disc at a variable [[angular velocity]] so as to obtain a constant bit rate. This is due to the angular velocity being greater at the outer edge of the disc than at the inner edge. The device must also simultaneously transfer the rotational motion of the laser motor into a linear path from the innermost edge of the disc to the outer edge while the laser is scanning the disc. This is an interesting mechanism and can be seen below. It utilizes a spiral engraved shaft to transmit motion to a plastic interface component that carries the laser the needed distance, at a predetermined rate. The device then uses several feedback mechanisms and circuitry to convert the laser information which is a measured voltage difference into binary coded data and exports it through the use of a parallel [[ATA]]-type communication link. The data can then be processed by software programs intended for the purpose of multi-media type data interpreting.