Group 39 - Black and Decker Drill - Revision history

J Ennis: /* Gearbox Parts Table */

2006-12-10T02:15:39Z

Gearbox Parts Table

J Ennis: /* Disassembly/Assembly */

2006-12-08T19:45:15Z

Disassembly/Assembly

J Ennis: /* Disassembly/Assembly */

2006-12-08T19:44:45Z

Disassembly/Assembly

J Ennis: /* Working Operation */

2006-12-08T19:39:18Z

Working Operation

J Ennis: /* Operation */

2006-12-08T19:34:20Z

Operation

J Ennis: /* Purpose */

2006-12-08T19:31:57Z

Purpose

J Ennis: /* Executive Summary */

2006-12-08T19:27:08Z

Executive Summary

J Ennis: /* Assembly */

2006-12-08T19:21:10Z

Assembly

J Ennis: /* Trigger Assembly Process Table */

2006-12-08T19:19:13Z

Trigger Assembly Process Table

J Ennis: /* Recommendations */

2006-12-08T18:44:08Z

Recommendations

@@ Line 511: / Line 511: @@
 | align="center" |Metal Casting
 | align="center" |Produces more power when in conjunction with other gears.
-| align="center" |[[Image:Large gear.jpg|thumb|Description]]
+| align="center" |[[Image:Large gear 39.jpg|thumb|Description]]
 | align="center" |See Below
 |-

@@ Line 669: / Line 669: @@
 The disassembly and reassembly processes were reverse of one another, the way the drill was designed, one would have to work from inside out to put the drill back together after working from the outside in to take it apart.
-The same tools were used to take the drill apart and put it back together.  These included a Flathead and #15 Torx.
+The same tools were used to take the drill apart and put it back together.  These included a flathead and #15 torx screwdriver.
 We were able to reassemble the drill because the parts were not assembled in the beginning in such a way that it made them impossible to put back together. They came apart in groups of pieces, and each group broke down into its individual parts which were easy to put back together.

@@ Line 669: / Line 669: @@
 The disassembly and reassembly processes were reverse of one another, the way the drill was designed, one would have to work from inside out to put the drill back together after working from the outside in to take it apart.
-The same tools were used to take the drill apart and put it back together.  These included a flathead and phillip screwdriver.
+The same tools were used to take the drill apart and put it back together.  These included a Flathead and #15 Torx.
 We were able to reassemble the drill because the parts were not assembled in the beginning in such a way that it made them impossible to put back together. They came apart in groups of pieces, and each group broke down into its individual parts which were easy to put back together.

@@ Line 655: / Line 655: @@
 ==After Assembly==
 ===Working Operation===
-After plugging in the drill and pulling the trigger, electricity flows through the drill. This flow coming from the cord goes into the motor, which then turns the gears. The gears then cause the chuck to spin either clockwise or counter clockwise based on which side the switch above the trigger is on. When you release the trigger, the motor deceases it output power and stops spinning which causes the gears and the chuck to stop. If one were to pull the trigger and press in the triangular button on the left side of the handle, the trigger locks in the pulled position and the drill continues to spin until the trigger is released, which then disengages the lock. Our product works the same after the dis/re-Assembly process.
+After plugging in the drill and pulling the trigger, electricity flows through the drill. This flow coming from the cord goes into the motor, which then turns the gears. The gears then cause the chuck to spin either clockwise or counter clockwise based on which side the switch above the trigger is on. When you release the trigger, the motor deceases its output power and stops spinning which causes the gears and the chuck to stop. If one were to pull the trigger and press in the triangular button on the left side of the handle, the trigger locks in the pulled position and the drill continues to spin until the trigger is released, which then disengages the lock. Our product works the same after the dis/re-assembly process.
 ===Analysis===

@@ Line 33: / Line 33: @@
 ===Operation===
-The drill works great. The drill bit moves clockwise, however you can switch it to turn counterclockwise. The ability to rotate clockwise is used in drilling and inserting/tightening screws, whereas counterclockwise motion is used to loosen or remove screws. The drill runs on AC power from the power outlet into mechanical power to the keyless chuck.
+The drill works great. The drill bit moves clockwise, however you can switch it to turn counterclockwise. The ability to rotate clockwise is used in drilling and inserting/tightening screws, whereas counterclockwise motion is used to loosen or remove screws. The drill runs on AC power from the power outlet which is converted into mechanical power to the keyless chuck.
 ===Components===

@@ Line 30: / Line 30: @@
 ==Before Disassembly Section==
 ===Purpose===
-The purpose of a drill is to producing holes in solid materials by using a drill bit and to insert, tighten, loosen or remove screws by using a screwdriver head. The drill bit is removable with cutting edges on one end and the shank at the other which is attached to the chuck of the drill. There are different types of drill bits, shank and chuck combinations designed for different purposes, like producing a higher torque. Detachable screwdriver heads are also called bits and come in different sizes and styles.  The drill bit and screwdriver head work by the drills electric motor rotating them at high speeds. This drill contains a solid state phase control circuits that allow it to only use AC power, which also gives it the ability to change speeds, go in reverse and torque control.
+The purpose of a drill is to producing holes in solid materials by using a drill bit as well as to drive, tighten, loosen or remove screws by using a screwdriver head. The drill bit is removable with cutting edges on one end and the shank at the other which is attached to the chuck of the drill. There are different types of drill bits, shank and chuck combinations designed for different purposes, like producing a higher torque. Detachable screwdriver heads are also called bits and come in different sizes and styles.  The drill bit and screwdriver head work by the drills electric motor rotating them at high speeds. This drill contains a solid state phase control circuits that allow it to only use AC power, which also gives it the ability to change speeds, go in reverse and torque control.
 ===Operation===

@@ Line 1: / Line 1: @@
 ==Executive Summary==
 [[Image:P1010001.JPG|thumb|Description]]
-We received a DR202 Black and Decker corded drill.  We disassembled the drill, analyzed all components, and then reassembled it.  There were approximately 20 mainline components and about 15 small end parts with  maintance only requiring a standard (flathead/phillips) screwdriver to do the work.
+We received a DR202 Black and Decker corded drill.  We disassembled the drill, analyzed all components, and then reassembled it.  There were approximately 20 mainline components and about 15 small end parts. Maintance only requiring a standard (flathead or #15 Torx) screwdriver.
-The major functioning parts to this product were the housing encasement, chuck, fan assembly, 5A motor, and the power cord.
+The major functioning parts to this product were the housing, keyless chuck, gear assembly, 5A motor, and the power cord.
 Every member of the team had a specific component to the final project.  The delegation of work for each person was appropriate so all members had an equal share.
 As far as the ergonomics to these tasks, there was very little that gave us (sophomore engineers) any trouble with any stage of this project.
 The company, Black and Decker, has done a great job over the past 90 years to ensure a safe, reliable, and cost effective product.
 ==Introduction==

@@ Line 556: / Line 556: @@
 |-
 | align="center" |1
-| align="center" |Start with right side drill housing
+| align="center" |Start with left side (looking down the drill) drill housing
-| align="center" |none
+| align="center" |None
 | align="center" |Easy
 |-

@@ Line 613: / Line 613: @@
 ===Trigger Assembly Process Table===
-Note** There are not many steps in assembling the trigger but they are very difficult and all pieces are very small.  Pay close attention so no pieces get lost during this process.  Assembly takes approxamately 15 minutes because of all the small pieces.
+Note** There are not many steps in assembling the trigger but they are very difficult and all pieces are very small.  Pay close attention so no pieces get lost during this process.  Assembly takes approxamately 15-20 minutes because of all the small pieces and extreme difficulty of step #5.
 {| border="3" cellspacing="0" cellpadding="3" align="center"
@@ Line 622: / Line 622: @@
 |-
 | align="center" |1
-| align="center" |Remove the upper housing from the lower housing.  At the bottom of a trigger there is a snap fit for these two pieces.  Wedge a very thin flathead screwdriver under the upper half and pop it out of the grooves, do this with the other side as well and the top will come right off.  The Metal Connection Piece will fall out during this step so make sure you do not lose it.
+| align="center" |Start off with the lower housing and insert the chip into its slot.
-| align="center" |Thin flathead screwdriver and hands
+| align="center" |Hands
 | align="center" |Medium  <30seconds
 |-
 | align="center" |2
-| align="center" |Remove the trigger from the upper housing by pulling it straigh out.  Then remove the spring which fits snug to the upper housing.  There is also a much smaller spring which fits into the bottom of the trigger.
+| align="center" |Place the slider spacer and slider on top of the chip.
 | align="center" |Hands
 | align="center" |Easy <30seconds
 |-
 | align="center" |3
-| align="center" |Remove the Rear plate by pulling it straight out of the back of the lower housing.
+| align="center" |Now move to the trigger.  Insert the small spring into the botom of it.
-| align="center" |Thin flathead screwdriver and Hands
+| align="center" |Hands
 | align="center" |Easy <15seconds
 |-
 | align="center" |4
-| align="center" |Remove the slider and slider spacer by simply pulling them off of the chip.
+| align="center" |Insert the large spring into the upper housing.  Put the trigger into the upper housing as well and press the lock down on the trigger to hold it in place.  This can be very tricky due to the tension on the spring.
 | align="center" |Hands
-| align="center" |Easy  <20seconds
+| align="center" |Medium  <20seconds
 |-
 | align="center" |5
-| align="center" |Remove the Chip by wiggling it lengthwise back and forth until it pulls straight out.  A small flathead screwdriver can assist in the process.
+| align="center" |Holding the upper housing upside down, place the electrical connection piece, upside down, on top of the small spring in the trigger.  On the bottom of the housing place the slider all the way to the back of the chip.  While holding the top housing upside down place the bottom housing onto it.  This process is extremely trickey and may take several attemps.
-| align="center" |Thin flathead screwdriver and hands
+| align="center" |Hands
-| align="center" |Medium  <1minute
+| align="center" |Difficult <5-8minutes
 |-
 |}

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 Its use is straight forward, and our group feels no additional recommendation would be required in this area. The few maintenance requirements may be changing the bit occasionally and keeping the mechanical components lubricated. Unless it’s used improperly or abused, it should never stop working.
-There are many models a customer could get from this company depending on the job requirements.  Since our product is a corded drill I could recommend replacing the cord for a cordless but Black and Decker already sells a different drill with this option so the suggestion would become redundant.  This company started in 1917 and since then has become a muti-billion dollar distributing industry.  Thousands of intelligent people from multiple generations have worked to improve this product, so it would be arrogent at best to presume that I could solve all possible design improvement this drill may need.
+There are many models a customer could get from this company depending on the job requirements.  Since our product is a corded drill I could recommend replacing the cord for a cordless but Black and Decker already sells a different drill with this option so the suggestion would become redundant.  This company started in 1917 and since then has become a multi-billion dollar distributing industry.  Thousands of intelligent people from multiple generations have worked to improve this product, so it would be arrogent at best to presume that I could solve all possible design improvement this drill may need.
 ==References==