Difference between revisions of "Group 3 - Black and Decker Drill"

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==Executive Summary==
 
==Executive Summary==
 
We disassembled, analyzed, and reassembled a Black & Decker power drill.
 
We disassembled, analyzed, and reassembled a Black & Decker power drill.
 +
This drill is a DR 202, 120 V, 50/60 Hz, 5 A, 0-1350 revolutions per minute power drill
  
 
We took each component of the drill apart and analyzed it to determine the function and why each part was made of it material and shape.  This helped us better understand how the drill worked on the component level.  
 
We took each component of the drill apart and analyzed it to determine the function and why each part was made of it material and shape.  This helped us better understand how the drill worked on the component level.  
  
By analysis and research we were able to determine what the component was. We also produced CAD drawings and pictures of each component.  After all this information was gathered we reassembled the drill.
+
By analysis and research, we were able to determine what each component was, and produced CAD drawings and pictures of each component.  After all this information was gathered, we reassembled the drill.
  
Assembly was
+
Assembly was fairy easy and basically the reverse of the disassembly process. 
  
After we disassembled, analyzed, and reassembled the Black & Decker power drill we gained a better comprehension of how the drill works.
+
After we disassembled, analyzed, and reassembled the Black & Decker power drill we gained a better comprehension of how the drill worked.
  
 
==Introduction==
 
==Introduction==
This product is a Black & Decker Drill which is built to use different size bits to drill holes in various materials.  The drill also has a reversable function.  This is accomplished by changing electrical energy into mechanical energy inside the drill motor.   
+
This product is a Black & Decker Drill which is designed to use different size bits to drill holes in various materials.  The drill runs by changing electrical energy into mechanical energy inside the drill motor.  The drill also has a reverse function.
  
 
Each member was responsible for the following parts of the project:
 
Each member was responsible for the following parts of the project:
  
Lazarus,Shawn ()
+
Shawn Lazarus (Disassembly & Presentation)
  
Sendlak,Christopher ()
+
Christopher Sendlak (Group Leader, Disassembly & Reassembly & Manufacturing Processes)
  
Davis,Angela ()
+
Angela Davis (Reassembly & Web Site)
  
Tewes,Jennifer ()
+
Jennifer Tewes (Disassembly & Reassembly & Web Site)
  
Theresanathan,Jerry()
+
Jerry Theresanathan (Disassembly & Pictures & Presentation)
  
 
==Before Disassembly==
 
==Before Disassembly==
  
 
===Purpose===
 
===Purpose===
The Black and Decker Drill is used to drill holes into various materials (ie. wood, sheetrock).  The drill uses an AC current from a wall and directs electricty to a motor to create rotational motion.  This motion is transferred to the gears in order to create rotation within the drill bit.
+
The Black and Decker Drill is used to drill holes into various materials (i.e. wood, sheetrock).  The drill uses an AC current from a wall and directs electricity to a motor to create rotational motion.  This motion is transferred to the gears in order to create rotation within the drill bit.
  
 
===Operation===
 
===Operation===
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! width="250" | Process
 
! width="250" | Process
 
! width="100" | Tool
 
! width="100" | Tool
! width="50" | Level of Difficulty
+
! width="250" | Level of Difficulty
 
|-  
 
|-  
 
| align="center" |1
 
| align="center" |1
 
| align="center" |Unscrewed screws to remove plastic casing (housing)
 
| align="center" |Unscrewed screws to remove plastic casing (housing)
| align="center" |Phillips Head Screwdriver
+
| align="center" |# 15 Torque Driver/Phillips Head Screwdriver
| align="center" |Easy
+
| align="center" |Easy.  Required minimal force to remove screws.  Housing than fell apart in two pieces
 
+
 
|-  
 
|-  
 
| align="center" |2
 
| align="center" |2
 
| align="center" |Removed electrical cord by unscrewing screws
 
| align="center" |Removed electrical cord by unscrewing screws
| align="center" |Phillips Head Screwdriver
+
| align="center" |# 15 Torque Driver/Phillips Head Screwdriver
| align="center" |Easy
+
| align="center" |Easy. Required minimal force to remove screws once the wires were exposed
 
|-
 
|-
 
| align="center" |3
 
| align="center" |3
 
| align="center" |Removed reverse switch that fits into hole at the base of the motor
 
| align="center" |Removed reverse switch that fits into hole at the base of the motor
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Very Easy
+
| align="center" |Very Easy.  Simply pulled out of the hole
 
|-  
 
|-  
 
| align="center" |4
 
| align="center" |4
 
| align="center" |Removed circuit box and its parts (two springs, metal strips, wires, silicon chip)
 
| align="center" |Removed circuit box and its parts (two springs, metal strips, wires, silicon chip)
 
| align="center" |Pliers and Alan Key
 
| align="center" |Pliers and Alan Key
| align="center" |Hard
+
| align="center" |Hard. The circuit box is very small making it hard for the removal of the small pieces inside of the circuit box
 
|-
 
|-
 
| align="center" |5
 
| align="center" |5
 
| align="center" |Separated drill bit, motor, gears, and magnetic field
 
| align="center" |Separated drill bit, motor, gears, and magnetic field
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Easy
+
| align="center" |Easy. All parts were easy to separate once they were free from the housing
 
|-
 
|-
 
| align="center" |6
 
| align="center" |6
| align="center" |Separated and removed small magnets
+
| align="center" |Separated and removed small brushes
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Easy
+
| align="center" |Easy. Brushes pushed out of their holders with minimal force
 
|-
 
|-
 
| align="center" |7
 
| align="center" |7
 
| align="center" |Unsnapped plastic casing around magnetic field
 
| align="center" |Unsnapped plastic casing around magnetic field
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Medium
+
| align="center" |Medium. The casing was pressed together tightly making it difficult to remove
 
|-
 
|-
 
| align="center" |8
 
| align="center" |8
 
| align="center" |Unscrewed large screws on magnetic field
 
| align="center" |Unscrewed large screws on magnetic field
| align="center" |Phillips Head Screwdriver
+
| align="center" |# 15 Torque Driver/Phillips Head Screwdriver
| align="center" |Easy
+
| align="center" |Easy. Once the field was exposed the screws were easy to see and required minimal force to remove
 
|-
 
|-
 
| align="center" |9
 
| align="center" |9
 
| align="center" |Unlocked the wire locks
 
| align="center" |Unlocked the wire locks
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Easy
+
| align="center" |Easy. Simply twist wire locks apart
 
|-
 
|-
 
| align="center" |10
 
| align="center" |10
 
| align="center" |Removed plastic ring that included two wires
 
| align="center" |Removed plastic ring that included two wires
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Easy
+
| align="center" |Easy. Simply pull the ring with wires away from the field
 
|-
 
|-
 
|}
 
|}
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! width="150" | Part Material & Reason for Material
 
! width="150" | Part Material & Reason for Material
 
! width="100" | Function
 
! width="100" | Function
 +
! width="100" | Reason for Shape
 
! width="100" | Part Manufacturing Process
 
! width="100" | Part Manufacturing Process
 
! width="50" | Image of Part
 
! width="50" | Image of Part
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| align="center" |Plastic<BR>Non-conducting to shield user from electricity and moving parts inside<BR> Rubber (grip)<BR>Comfort to user
 
| align="center" |Plastic<BR>Non-conducting to shield user from electricity and moving parts inside<BR> Rubber (grip)<BR>Comfort to user
 
| align="center" |To contain all components, and make the drill user-friendly
 
| align="center" |To contain all components, and make the drill user-friendly
 +
| align="center" |To contain all of the components inside and to allow the user to easily use the drill
 
| align="center" |Injection Molding
 
| align="center" |Injection Molding
| |[[Image:MAE_pics_007.jpg|center|thumb|100px]]
+
| |[[Image:MAE_pics_007.jpg|center|thumb|100px]]  
|
+
 
|-  
 
|-  
 
| align="center" | 2
 
| align="center" | 2
 
| align="center" |Screws
 
| align="center" |Screws
 
| align="center" |11 (Casing Screws) 2(Long Screws)
 
| align="center" |11 (Casing Screws) 2(Long Screws)
| align="center" |Metal<BR>Strength and longivity of part
+
| align="center" |Metal<BR>Strength and longevity of part
 
| align="center" |Holds separate components together
 
| align="center" |Holds separate components together
 +
| align="center" |Phillips head to allow for easy alignment during manufacturing
 
|align="center" |Machined
 
|align="center" |Machined
| |[[Image:MAE_pics_062.jpg|center|thumb|100px]]
+
| |[[Image:MAE_pics_062.jpg|center|thumb|100px]]  
|
+
 
|-
 
|-
  
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| align="center" |Level
 
| align="center" |Level
 
| align="center" |1
 
| align="center" |1
| align="center" |Plastic (externally)<BR>Strengh and durability<BR> Liquid (internally)<BR>To allow for the bubble to balance in the liquid
+
| align="center" |Plastic (externally)<BR>Strength and durability<BR> Liquid (internally)<BR>To allow for the bubble to balance in the liquid
 
| align="center" |Shows the user if the drill is being held horizontally
 
| align="center" |Shows the user if the drill is being held horizontally
 +
| align="center" |To effectively allow for the bubble to be read easily and to show if the drill is horizontal
 
| align="center" |Injection Molding
 
| align="center" |Injection Molding
 
| |[[Image:MAE_pics_055.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_055.jpg|center|thumb|100px]]
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| align="center" |Keyless Chuck
 
| align="center" |Keyless Chuck
 
| align="center" |1
 
| align="center" |1
| align="center" |Plastic (externally)<BR>Comfort of use for user<BR> Steel (internally)<BR>Stenght and longevity
+
| align="center" |Plastic (externally)<BR>Comfort of use for user<BR> Steel (internally)<BR>Strength and longevity
 
| align="center" |Place for the bit to be held
 
| align="center" |Place for the bit to be held
 +
| align="center" |To allow for the drill bit to be held in place easily
 
| align="center" |Injection Molding and Machined
 
| align="center" |Injection Molding and Machined
 
| |[[Image:MAE_pics_039.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_039.jpg|center|thumb|100px]]
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| align="center" |Copper<BR>Conductor of electricity<BR> Plastic (insulation)<BR>Shield other components from electricity
 
| align="center" |Copper<BR>Conductor of electricity<BR> Plastic (insulation)<BR>Shield other components from electricity
 
| align="center" |Supplies power to components
 
| align="center" |Supplies power to components
 +
| align="center" |To supply enough power to the components but also small enough to fit into tight spaces in the drill
 
| align="center" |Extruded  
 
| align="center" |Extruded  
 
| |[[Image:MAE_pics_061.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_061.jpg|center|thumb|100px]]
Line 177: Line 181:
 
| align="center" |Cord
 
| align="center" |Cord
 
| align="center" |1
 
| align="center" |1
| align="center" |Plastic (externally)<BR>Shield user from electrcity<BR> Copper wiring (internally)<BR>Conductor of electricity
+
| align="center" |Plastic (externally)<BR>Shield user from electricity<BR> Copper wiring (internally)<BR>Conductor of electricity
 
| align="center" |Supplies power to the whole drill  
 
| align="center" |Supplies power to the whole drill  
 +
| align="center" |Allows for the cord to be flexible and fit into a standard power outlet
 
| align="center" |Extruded
 
| align="center" |Extruded
 
| |[[Image:MAE_pics_052.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_052.jpg|center|thumb|100px]]
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| align="center" |Trigger
 
| align="center" |Trigger
 
| align="center" |1
 
| align="center" |1
| align="center" |Plastic<BR>Sheild user from electricity on the inside
+
| align="center" |Plastic<BR>Shield user from electricity on the inside
| align="center" |Contolls the speed
+
| align="center" |Contols the speed
 +
| align="center" | Easily conforms to the users fingers to allow for easy use
 
| align="center" |Injection Molding
 
| align="center" |Injection Molding
 
| |[[Image:MAE_pics_054.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_054.jpg|center|thumb|100px]]
Line 193: Line 199:
 
| align="center" |Chip
 
| align="center" |Chip
 
| align="center" |1
 
| align="center" |1
| align="center" |Silicon<BR>Condutor of electricity and computational power
+
| align="center" |Silicon<BR>Conductor of electricity and computational power
 
| align="center" |Controls the power supply
 
| align="center" |Controls the power supply
| align="center" |Silicon dipping Implantation
+
| align-"center" |Allows for efficient power control
 +
| align="center" |Silicon Dipping Implantation
 
| |[[Image:MAE_pics_013.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_013.jpg|center|thumb|100px]]
 
|-
 
|-
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| align="center" |Copper<BR>Conductor of electricity
 
| align="center" |Copper<BR>Conductor of electricity
 
| align="center" |Allows for the generation of power
 
| align="center" |Allows for the generation of power
 +
| align="center" |Many coils to more effectively produce current
 
| align="center" |Copper wire wound around central axel(Insulated)
 
| align="center" |Copper wire wound around central axel(Insulated)
 
| |[[Image:MAE_pics_037.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_037.jpg|center|thumb|100px]]
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| align="center" |3
 
| align="center" |3
 
| align="center" |Metal<BR>Strength and durability
 
| align="center" |Metal<BR>Strength and durability
| align="center" |Allows tranfer of electricity in the coil of the central axis
+
| align="center" |Allows transfer of electricity in the coil of the central axis
|  
+
| align="center" |Cylindrical and formed around the axial to be able to connect effectively to the field and the axial which allows for the rotation of the components
 +
| align="center" |Sheet Metal Forming and Machining
 
| |[[Image:MAE_pics_038.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_038.jpg|center|thumb|100px]]
 
|-
 
|-
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| align="center" |Plastic<BR>Strength and comfort for user
 
| align="center" |Plastic<BR>Strength and comfort for user
 
| align="center" |Changes the direction that the chuck rotates in
 
| align="center" |Changes the direction that the chuck rotates in
 +
| align="center" |Allows of ease of use by the user and to efficiently switch the direction of the current.
 
| align="center" |Injection Molding
 
| align="center" |Injection Molding
 
| |[[Image:MAE_pics_053.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_053.jpg|center|thumb|100px]]
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| align="center" |Metal<BR>Strength and durability  
 
| align="center" |Metal<BR>Strength and durability  
 
| align="center" |Allows for motor rotation
 
| align="center" |Allows for motor rotation
 +
| align="center" |Allows for easy rotation because it is a cylindrical shape
 
| align="center" |Machined
 
| align="center" |Machined
 
| |[[Image:MAE_pics_034.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_034.jpg|center|thumb|100px]]
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| align="center" |Plastic<BR>Light weight and durability
 
| align="center" |Plastic<BR>Light weight and durability
 
| align="center" |Draws air into the drill to cool down the motor
 
| align="center" |Draws air into the drill to cool down the motor
 +
| align="center" |Fin shape to sufficiently draw air over the drill components
 
| align="center" |Injection Molding
 
| align="center" |Injection Molding
 
| |[[Image:MAE_pics_030.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_030.jpg|center|thumb|100px]]
Line 243: Line 255:
 
| align="center" |1
 
| align="center" |1
 
| align="center" |Copper<BR>Conductor of electricity
 
| align="center" |Copper<BR>Conductor of electricity
| align="center" |Allows for power genetration from the motor
+
| align="center" |Allows for power generation from the motor
 +
| align="center" |Many coils allow for the effective generation of power
 
| align="center" |Copper wire wound on Injection Molded plastic encased in formed sheet metal  
 
| align="center" |Copper wire wound on Injection Molded plastic encased in formed sheet metal  
 
| |[[Image:MAE_pics_041.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_041.jpg|center|thumb|100px]]
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| align="center" |1
 
| align="center" |1
 
| align="center" |Metal<BR>Strength and longevity
 
| align="center" |Metal<BR>Strength and longevity
| align="center" |Regulates the rotation of the spindle, aides in dissapation of heat
+
| align="center" |Regulates the rotation of the spindle, aides in dissipation of heat
 +
| align="center" |Ridges to control the rotation and the holes to allow for heat to escape
 
| align="center" |Die Cast
 
| align="center" |Die Cast
 
| |[[Image:MAE_pics_033.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_033.jpg|center|thumb|100px]]
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| align="center" |Armature
 
| align="center" |Armature
 
| align="center" |1
 
| align="center" |1
| align="center" |Metal<BR>Conductor of electrcity
+
| align="center" |Metal<BR>Conductor of electricity
 
| align="center" |Facilitates transfer of power from the coil
 
| align="center" |Facilitates transfer of power from the coil
|  
+
| align="center" |Circular to encase the coil and to effectively transfer the electricity to the other components
 +
| align="center" |Die Cast
 
| |[[Image:MAE_pics_037.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_037.jpg|center|thumb|100px]]
 
|-
 
|-
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| align="center" |Metal(Aluminum)<BR>Durability
 
| align="center" |Metal(Aluminum)<BR>Durability
 
| align="center" |Holds the cord in place
 
| align="center" |Holds the cord in place
 +
| align="center" |To hold the wires down without being bulky to get in the way of other components
 
| align="center" |Sheet metal forming
 
| align="center" |Sheet metal forming
 
| |[[Image:MAE_pics_059.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_059.jpg|center|thumb|100px]]
|
 
 
|-
 
|-
 
| align="center" |18
 
| align="center" |18
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| align="center" |Plastic<BR>Light weight and non-conductor of electricity
 
| align="center" |Plastic<BR>Light weight and non-conductor of electricity
 
| align="center" |Protects and insulates the coil
 
| align="center" |Protects and insulates the coil
 +
| align="center" |Formed around the field to contain the electricity that the field forms
 
| align="center" |Injection molding
 
| align="center" |Injection molding
 
| |[[Image:MAE_pics_060.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_060.jpg|center|thumb|100px]]
Line 286: Line 302:
 
| align="center" |Carbon<BR>Longevity to withstand repeated friction
 
| align="center" |Carbon<BR>Longevity to withstand repeated friction
 
| align="center" |Contact commuter determines drive direction
 
| align="center" |Contact commuter determines drive direction
 +
| align="center" |To make efficient contact with the commutator
 
| align="center" |Machined
 
| align="center" |Machined
 
| |[[Image:MAE_pics_056.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_056.jpg|center|thumb|100px]]
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| align="center" |Metal(Brass)<BR>Strength and longevity to withstand friction
 
| align="center" |Metal(Brass)<BR>Strength and longevity to withstand friction
 
| align="center" |Hold the brushes stationary
 
| align="center" |Hold the brushes stationary
 +
| align="center" |To effectively hold the brushes in place
 
| align="center" |Sheet metal forming
 
| align="center" |Sheet metal forming
 
| |[[Image:MAE_pics_046.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_046.jpg|center|thumb|100px]]
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| align="center" |Metal <BR>Conductor of electricity
 
| align="center" |Metal <BR>Conductor of electricity
 
| align="center" |Regulates power supply to the brushes
 
| align="center" |Regulates power supply to the brushes
| align="center" |Sheet meatl forming
+
| align="center" |Spring shape efficiently regulate power to the brushes
 +
| align="center" |Sheet metal forming
 
| |[[Image:MAE_pics_046.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_046.jpg|center|thumb|100px]]
 
|-
 
|-
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| align="center" |Metal<BR>Strength and Durability
 
| align="center" |Metal<BR>Strength and Durability
 
| align="center" |Transfers motion to the chuck
 
| align="center" |Transfers motion to the chuck
 +
| align="center" |To allow for maximum amount of rotational motion transfer along the drill head
 
| align="center" |Extruded
 
| align="center" |Extruded
 
| |[[Image:MAE_pics_058.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_058.jpg|center|thumb|100px]]
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| align="center" |Metal<BR> Strength and longevity
 
| align="center" |Metal<BR> Strength and longevity
 
| align="center" |Holds the gears in place
 
| align="center" |Holds the gears in place
 +
| align="center" |To hold all of the gears in place without causing unnecessary friction
 
| align="center" |Die Cast
 
| align="center" |Die Cast
 
| |[[Image:MAE_pics_063.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_063.jpg|center|thumb|100px]]
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| align="center" |Cloth<BR>Good cushion to prevent parts from rubbing together
 
| align="center" |Cloth<BR>Good cushion to prevent parts from rubbing together
 
| align="center" |Reduces friction due to the rotating gears and chuck
 
| align="center" |Reduces friction due to the rotating gears and chuck
| --
+
| align="center" |Circular to fit on the axial and thick to cushion the rotating parts from each other
 +
| align="center" |Machining
 
| |[[Image:MAE_pics_028.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_028.jpg|center|thumb|100px]]
 
| |[[Image:large_washer.jpg|center|thumb|100px]]
 
| |[[Image:large_washer.jpg|center|thumb|100px]]
 
|-
 
|-
 
| align="center" |25
 
| align="center" |25
| align="center" |Magnetic Insultator
+
| align="center" |Magnetic Insulator
 
| align="center" |1
 
| align="center" |1
| align="center" |Cardboard<BR>Insolator
+
| align="center" |Cardboard<BR>Insulator
 
| align="center" |Insulates the copper coil from outside interference
 
| align="center" |Insulates the copper coil from outside interference
| --
+
| align="center" |Inside of the coil and shaped like the coil to insulate the coil and to minimize space taken up by the insulator
 +
| align="center" |Machining
 
| |[[Image:MAE_pics_045.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_045.jpg|center|thumb|100px]]
 
|-
 
|-
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| align="center" |Circuit Box
 
| align="center" |Circuit Box
 
| align="center" |1
 
| align="center" |1
| align="center" |Plastic<BR>Insulator of electrcity
+
| align="center" |Plastic<BR>Insulator of electricity
| align="center" |Controlls the speed of motor  
+
| align="center" |Controls the speed of motor  
| --
+
| align="center" |To contain all of the internal components effectively in as small of a space as possible
 +
| align="center" |Injection Molding (casing) Machining(Inside components)
 
| |[[Image:MAE_pics_016.jpg|center|thumb|100px]]
 
| |[[Image:MAE_pics_016.jpg|center|thumb|100px]]
 
|-
 
|-
 
|}
 
|}
  
===Drill Head Assembly===
+
===Drill Head and Gear Box Assembly===
 
{| border="3" cellspacing="0" cellpadding="3" align="center"
 
{| border="3" cellspacing="0" cellpadding="3" align="center"
! width="50" | Part Name
+
! width="100" | Part Name
! width="50" | Picture
+
! width="100" | Picture
! width="50" | CAD File
+
! width="100" | CAD File
 
|-
 
|-
  
| align="center" |
+
|align="center" |Whole Front Assembly
| align="center" |
+
||[[Image:MAE_pics_022.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:front_assembly_2.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Drill Head Assembly
| align="center" |
+
||[[Image:MAE_pics_040.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:Drill_Head_assembly_2.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Gear Assembly
| align="center" |
+
||[[Image:MAE_pics_028.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:gear_assembly.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Gear and Plate Assembly
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:plate_gear_assembly.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Small Gear Assembly
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:Small_Gear_Assembly.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Small Gear
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:small_gear.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Small Washer
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:small_washer.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Small Plate
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:small_plate.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Large Gear
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:large_gear.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Large Washer
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:large_washer.jpg|center|thumb|100px]]
 
|-
 
|-
  
| align="center" |
+
| align="center" |Large Plate
| align="center" |
+
||[[Image:MAE_pics_021.jpg|center|thumb|100px]]
| align="center" |
+
||[[Image:Large_Plate.jpg|center|thumb|100px]]
|-
+
  
| align="center" |
 
| align="center" |
 
| align="center" |
 
|-
 
  
| align="center" |
 
| align="center" |
 
| align="center" |
 
|-
 
  
| align="center" |
+
|}
| align="center" |
+
| align="center" |
+
|-
+
  
| align="center" |
+
===Design Changes on the Component Level===
| align="center" |
+
| align="center" |
+
|-
+
  
 
+
A change that could be made on the component level of the drill would be to mold the bit holder and level into the plastic housing.  This could be accomplished by setting holder and level to one side of the two housing halves, because in the current design the bit holder and the level are placed between the two halves of the housing.  This would be advantageous because these pieces would not be able to slide around in their current slots, and it could also decrease assembly time. Unfortunately, there are no components on the inside of the drill that could be combined because most of the parts need to rotate separately to allow the drill to function.
|}
+
  
 
==Assembly==
 
==Assembly==
Line 441: Line 449:
 
! width="250" | Process
 
! width="250" | Process
 
! width="100" | Tool
 
! width="100" | Tool
! width="50" | Level of Difficulty
+
! width="250" | Level of Difficulty
 
|-  
 
|-  
 
| align="center" |1
 
| align="center" |1
 
| align="center" |Connect Chuck to Gears and Plate.  Place in Housing
 
| align="center" |Connect Chuck to Gears and Plate.  Place in Housing
 
| align="center" |Hands
 
| align="center" |Hands
| align="center" |Easy
+
| align="center" |Easy. Just place parts together and set into housing
 
|-  
 
|-  
 
| align="center" |2
 
| align="center" |2
Line 454: Line 462:
 
|-
 
|-
 
| align="center" |3
 
| align="center" |3
| align="center" |
+
| align="center" |Connect wires to straiter and armature
| align="center" |
+
| align="center" |Hands
| align="center" |
+
| align="center" |Medium.  Make sure wires are correctly aligned and attached to the field
 
|-  
 
|-  
 
| align="center" |4
 
| align="center" |4
| align="center" |
+
| align="center" |Using the long screws, connect motor and commuter together
| align="center" |
+
| align="center" |# 15 Torque Driver/Phillips Screwdriver
| align="center" |
+
| align="center" |Hard.  Needed to make sure all parts were aligned, which was difficult due to the lack of visibility
 
|-
 
|-
 
| align="center" |5
 
| align="center" |5
| align="center" |
+
| align="center" |Attach trigger to the housing
| align="center" |
+
| align="center" |Hands
| align="center" |
+
| align="center" |Easy.  Just place in the hole in the housing
 
|-
 
|-
 
| align="center" |6
 
| align="center" |6
| align="center" |
+
| align="center" |Connect wires from straiter and armature to the trigger
| align="center" |
+
| align="center" |Hands
| align="center" |
+
| align="center" |Easy.  Make sure that the wires are connected into the current holes
 
|-
 
|-
 
| align="center" |7
 
| align="center" |7
| align="center" |
+
| align="center" |Connect cord to wires
| align="center" |
+
| align="center" |Hands
| align="center" |
+
| align="center" |Easy. Make sure that like wires are connected to each other and simply twist ends together
 
|-
 
|-
 
| align="center" |8
 
| align="center" |8
| align="center" |
+
| align="center" |Screw wire clamp over the wires from the cord
| align="center" |
+
| align="center" |# 15 Torque Driver/Phillips Screwdriver
| align="center" |
+
| align="center" |Easy. Screws are easy to attach because of the high visibility of the parts
 
|-
 
|-
 
| align="center" |9
 
| align="center" |9
| align="center" |
+
| align="center" |Attach reverse switch to housing
| align="center" |
+
| align="center" |Hands
| align="center" |
+
| align="center" |Easy.  Slides into hole
 
|-
 
|-
 
| align="center" |10
 
| align="center" |10
| align="center" |
+
| align="center" |Attach level to housing
| align="center" |
+
| align="center" |Hands
| align="center" |
+
| align="center" |Easy. Simply place in slot on top of housing
 
|-
 
|-
 +
| align="center" |11
 +
| align="center" |Attach level to housing
 +
| align="center" |Hands
 +
| align="center" |Easy. Slide into the hole in the housing
 +
|-
 +
| align="center" |12
 +
| align="center" |Attach bit holder to housing
 +
| align="center" |Hands
 +
| align="center" |Easy. Slide into hole on the housing
 +
|-
 +
| align="center" |13
 +
| align="center" |Fit top half of housing on top and screw two halves together
 +
| align="center" |# 15 Torque Driver/Phillips Screwdriver
 +
| align="center" |Easy but time consuming to screw in all the individual screws into the casing; also to properly align housing make sure that the wires are out of the way
 
|}
 
|}
  
 
==After Assembly==
 
==After Assembly==
 +
===Disassembly vs. Reassembly Discussion===
 +
The disassembly and reassembly process were basically the reverse of each other.  It took less time to disassemble then to reassemble because during reassembly we had to make sure that everything was properly aligned. When the drill was disassembled it basically fell out of the housing once the two halves were separated.  To reassemble the drill it took more time to properly align all of the components.  The exact same tools were used for both disassembly and reassembly.  The entire drill was able to be reassembled with relative ease but it is suggested that it is not used for an extended period of time because of the grease that was lost form the gears during the disassembly process.
 +
 
===Operation===
 
===Operation===
===Conclusion===
+
 
 +
The drill works by converting electrical energy from the AC power cord to mechanical energy to rotate the spindle and motor.  The now mechanical energy allows the chuck to rotate and the drill to operate. Also, a magnetic field exists between the stator and the armature. This allows for a current to be produced in the field, which in turn produces a voltage that is controlled by the trigger. This control allows for the variable speeds of the drill.  The commutator allows the drill to run on direct power (DC) instead on alternating (AC) power. It does this by periodically reversing the direction of the current produced by the motor.  This produces rotational motion that is transformed along the spindle to the chuck.  The reverse switch allows for the change in direction of the current which in turn changes the direction in which the chuck rotates.  The fan on the spindle allows for the constant cooling down of the gears and other rotating parts.
 +
 
 +
===Analysis Discussion===
 +
 
 +
Thermodynamic analysis could be used to determine the threshold condition that will cause the drill to overheat and possibly start on fire.  A working prototype of the drill or an actual drill could be used as the model for this test.  Stress analysis could be used to determine the wear and tear on the chuck from repeated use.  The model for this again could be a working prototype or an actual drill.  Another type of analysis that could be is strength and durability testing on the plastic housing.  This is important because the consumer does not want to buy a product that will break the first time it is dropped.  A model that could be used for this is a working prototype.
 +
 
 +
===Design Changes and Recommendations===
 +
One design change could be to have another handle on the drill along the chuck.  This would provide more stability for the user because the center of mass is above the handle, making it top heavy and awkward to hold.  This extra handle would allow for the user to more easily support the drill.  This handle could also be removable so that a consumer who does not like this extra handle, or if the handle was to get in the way in a small space then it could be removed.  This could be accomplished with clips on the casing that this extra handle could be attached.  A second design change could be to have a cord that is retractable, this would allow the user to easily store the drill and not have cords tangle up.  Another feature that could be changed would be to allow the chuck to fit various size bits.  This would allow the user to customize the drill to their own specifications.  This can be accomplished by having the option for the user to change the chuck so that a different bit sixe could be used. At a marketing standpoint this is a good ploy because the company will be able to make more money off of the different chucks that they sell.  The product would also be more appealing to consumers too; they would like the idea that the drill has more features than other brands, as well as the idea that they can just use one drill for any size bit.  Also the company could make the housing from recyclable plastic.  This is a way to cut down on material cost for the company because they could recycle the plastic from old or broken drills.  This could be accomplished by having consumers return their broken drills for a discount or some other marketing ploy.  These could make the drill a more desirable product for consumers, which in turn would make the company more productive.
  
 
==References==
 
==References==
 +
 +
Black & Decker. (2003). ''Instruction Manual for Models DR201, DR202, DR211, DR220, DR403, DR501 and DR601''. Towson, MD: Author.
 +
 +
Commutator (electric). (2006, September 18). In ''Wikipedia, The Free Encyclopedia''. Retrieved 14:06, November 22, 2006, from http://en.wikipedia.org/w/index.php?title=Commutator_%28electric%29&oldid=76368620

Latest revision as of 10:13, 8 December 2006

Contents

Executive Summary

We disassembled, analyzed, and reassembled a Black & Decker power drill. This drill is a DR 202, 120 V, 50/60 Hz, 5 A, 0-1350 revolutions per minute power drill

We took each component of the drill apart and analyzed it to determine the function and why each part was made of it material and shape. This helped us better understand how the drill worked on the component level.

By analysis and research, we were able to determine what each component was, and produced CAD drawings and pictures of each component. After all this information was gathered, we reassembled the drill.

Assembly was fairy easy and basically the reverse of the disassembly process.

After we disassembled, analyzed, and reassembled the Black & Decker power drill we gained a better comprehension of how the drill worked.

Introduction

This product is a Black & Decker Drill which is designed to use different size bits to drill holes in various materials. The drill runs by changing electrical energy into mechanical energy inside the drill motor. The drill also has a reverse function.

Each member was responsible for the following parts of the project:

Shawn Lazarus (Disassembly & Presentation)

Christopher Sendlak (Group Leader, Disassembly & Reassembly & Manufacturing Processes)

Angela Davis (Reassembly & Web Site)

Jennifer Tewes (Disassembly & Reassembly & Web Site)

Jerry Theresanathan (Disassembly & Pictures & Presentation)

Before Disassembly

Purpose

The Black and Decker Drill is used to drill holes into various materials (i.e. wood, sheetrock). The drill uses an AC current from a wall and directs electricity to a motor to create rotational motion. This motion is transferred to the gears in order to create rotation within the drill bit.

Operation

The product works and runs smoothly by changing AC power from a power outlet into mechanical energy in the drill to turn the bit. This is demonstrated best when the drill's trigger is pulled because you can hear the motor and the cooling fan rotating.

Amount of Components

We estimated that the drill is made of approximately ten components. These ten components include:

  1. Motor
  2. Trigger switch
  3. Cord
  4. Drill bit
  5. Level
  6. Cooling fan
  7. Casing
  8. Direction switch
  9. Trigger lock
  10. Chuck
  11. Screws
  12. Gears

Types of Materials

We estimated that the drill is made of approximately five materials. These five materials include:

  1. Plastic
  2. Rubber
  3. Steel
  4. Copper wiring
  5. Water (Liquid in level)

Disassembly Procedure

Disassembly Process Table

Step Number Process Tool Level of Difficulty
1 Unscrewed screws to remove plastic casing (housing) # 15 Torque Driver/Phillips Head Screwdriver Easy. Required minimal force to remove screws. Housing than fell apart in two pieces
2 Removed electrical cord by unscrewing screws # 15 Torque Driver/Phillips Head Screwdriver Easy. Required minimal force to remove screws once the wires were exposed
3 Removed reverse switch that fits into hole at the base of the motor Hands Very Easy. Simply pulled out of the hole
4 Removed circuit box and its parts (two springs, metal strips, wires, silicon chip) Pliers and Alan Key Hard. The circuit box is very small making it hard for the removal of the small pieces inside of the circuit box
5 Separated drill bit, motor, gears, and magnetic field Hands Easy. All parts were easy to separate once they were free from the housing
6 Separated and removed small brushes Hands Easy. Brushes pushed out of their holders with minimal force
7 Unsnapped plastic casing around magnetic field Hands Medium. The casing was pressed together tightly making it difficult to remove
8 Unscrewed large screws on magnetic field # 15 Torque Driver/Phillips Head Screwdriver Easy. Once the field was exposed the screws were easy to see and required minimal force to remove
9 Unlocked the wire locks Hands Easy. Simply twist wire locks apart
10 Removed plastic ring that included two wires Hands Easy. Simply pull the ring with wires away from the field

After Disassembly

Part Table

Part Number Part Name Number of Parts of This Type Part Material & Reason for Material Function Reason for Shape Part Manufacturing Process Image of Part CAD File
1 Housing 1 Plastic
Non-conducting to shield user from electricity and moving parts inside
Rubber (grip)
Comfort to user
To contain all components, and make the drill user-friendly To contain all of the components inside and to allow the user to easily use the drill Injection Molding
MAE pics 007.jpg
2 Screws 11 (Casing Screws) 2(Long Screws) Metal
Strength and longevity of part
Holds separate components together Phillips head to allow for easy alignment during manufacturing Machined
MAE pics 062.jpg
3 Level 1 Plastic (externally)
Strength and durability
Liquid (internally)
To allow for the bubble to balance in the liquid
Shows the user if the drill is being held horizontally To effectively allow for the bubble to be read easily and to show if the drill is horizontal Injection Molding
MAE pics 055.jpg
4 Keyless Chuck 1 Plastic (externally)
Comfort of use for user
Steel (internally)
Strength and longevity
Place for the bit to be held To allow for the drill bit to be held in place easily Injection Molding and Machined
MAE pics 039.jpg
Drill Head assembly 2.jpg
5 Wiring 1 Copper
Conductor of electricity
Plastic (insulation)
Shield other components from electricity
Supplies power to components To supply enough power to the components but also small enough to fit into tight spaces in the drill Extruded
MAE pics 061.jpg
6 Cord 1 Plastic (externally)
Shield user from electricity
Copper wiring (internally)
Conductor of electricity
Supplies power to the whole drill Allows for the cord to be flexible and fit into a standard power outlet Extruded
MAE pics 052.jpg
7 Trigger 1 Plastic
Shield user from electricity on the inside
Contols the speed Easily conforms to the users fingers to allow for easy use Injection Molding
MAE pics 054.jpg
8 Chip 1 Silicon
Conductor of electricity and computational power
Controls the power supply Allows for efficient power control Silicon Dipping Implantation
MAE pics 013.jpg
9 Armature Coil 1 Copper
Conductor of electricity
Allows for the generation of power Many coils to more effectively produce current Copper wire wound around central axel(Insulated)
MAE pics 037.jpg
10 Commucator 3 Metal
Strength and durability
Allows transfer of electricity in the coil of the central axis Cylindrical and formed around the axial to be able to connect effectively to the field and the axial which allows for the rotation of the components Sheet Metal Forming and Machining
MAE pics 038.jpg
11 Reverse Switch 1 Plastic
Strength and comfort for user
Changes the direction that the chuck rotates in Allows of ease of use by the user and to efficiently switch the direction of the current. Injection Molding
MAE pics 053.jpg
12 Armature Axel 1 Metal
Strength and durability
Allows for motor rotation Allows for easy rotation because it is a cylindrical shape Machined
MAE pics 034.jpg
13 Cooling Fan 1 Plastic
Light weight and durability
Draws air into the drill to cool down the motor Fin shape to sufficiently draw air over the drill components Injection Molding
MAE pics 030.jpg
14 Field 1 Copper
Conductor of electricity
Allows for power generation from the motor Many coils allow for the effective generation of power Copper wire wound on Injection Molded plastic encased in formed sheet metal
MAE pics 041.jpg
15 Heat Sink 1 Metal
Strength and longevity
Regulates the rotation of the spindle, aides in dissipation of heat Ridges to control the rotation and the holes to allow for heat to escape Die Cast
MAE pics 033.jpg
16 Armature 1 Metal
Conductor of electricity
Facilitates transfer of power from the coil Circular to encase the coil and to effectively transfer the electricity to the other components Die Cast
MAE pics 037.jpg
17 Cord Clamp 1 Metal(Aluminum)
Durability
Holds the cord in place To hold the wires down without being bulky to get in the way of other components Sheet metal forming
MAE pics 059.jpg
18 Casing of copper coil and metal rings 1 Plastic
Light weight and non-conductor of electricity
Protects and insulates the coil Formed around the field to contain the electricity that the field forms Injection molding
MAE pics 060.jpg
19 Brushes 2 Carbon
Longevity to withstand repeated friction
Contact commuter determines drive direction To make efficient contact with the commutator Machined
MAE pics 056.jpg
20 Brush Holders 2 Metal(Brass)
Strength and longevity to withstand friction
Hold the brushes stationary To effectively hold the brushes in place Sheet metal forming
MAE pics 046.jpg
21 Coil Springs 2 Metal
Conductor of electricity
Regulates power supply to the brushes Spring shape efficiently regulate power to the brushes Sheet metal forming
MAE pics 046.jpg
22 Gear and Pinion 3 Metal
Strength and Durability
Transfers motion to the chuck To allow for maximum amount of rotational motion transfer along the drill head Extruded
MAE pics 058.jpg
Small Gear Assembly.jpg
23 Plate 2 Metal
Strength and longevity
Holds the gears in place To hold all of the gears in place without causing unnecessary friction Die Cast
MAE pics 063.jpg
Large Plate.jpg
24 Cloth Washer 1 Cloth
Good cushion to prevent parts from rubbing together
Reduces friction due to the rotating gears and chuck Circular to fit on the axial and thick to cushion the rotating parts from each other Machining
MAE pics 028.jpg
Large washer.jpg
25 Magnetic Insulator 1 Cardboard
Insulator
Insulates the copper coil from outside interference Inside of the coil and shaped like the coil to insulate the coil and to minimize space taken up by the insulator Machining
MAE pics 045.jpg
26 Circuit Box 1 Plastic
Insulator of electricity
Controls the speed of motor To contain all of the internal components effectively in as small of a space as possible Injection Molding (casing) Machining(Inside components)
MAE pics 016.jpg

Drill Head and Gear Box Assembly

Part Name Picture CAD File
Whole Front Assembly
MAE pics 022.jpg
Front assembly 2.jpg
Drill Head Assembly
MAE pics 040.jpg
Drill Head assembly 2.jpg
Gear Assembly
MAE pics 028.jpg
Gear assembly.jpg
Gear and Plate Assembly
MAE pics 021.jpg
Plate gear assembly.jpg
Small Gear Assembly
MAE pics 021.jpg
Small Gear Assembly.jpg
Small Gear
MAE pics 021.jpg
Small gear.jpg
Small Washer
MAE pics 021.jpg
Small washer.jpg
Small Plate
MAE pics 021.jpg
Small plate.jpg
Large Gear
MAE pics 021.jpg
Large gear.jpg
Large Washer
MAE pics 021.jpg
Large washer.jpg
Large Plate
MAE pics 021.jpg
Large Plate.jpg


Design Changes on the Component Level

A change that could be made on the component level of the drill would be to mold the bit holder and level into the plastic housing. This could be accomplished by setting holder and level to one side of the two housing halves, because in the current design the bit holder and the level are placed between the two halves of the housing. This would be advantageous because these pieces would not be able to slide around in their current slots, and it could also decrease assembly time. Unfortunately, there are no components on the inside of the drill that could be combined because most of the parts need to rotate separately to allow the drill to function.

Assembly

Assembly Process Table

Step Number Process Tool Level of Difficulty
1 Connect Chuck to Gears and Plate. Place in Housing Hands Easy. Just place parts together and set into housing
2 Attach Brushes into Brush holders Needle nose pliers Hard. Needed to pull springs back to attach brushes
3 Connect wires to straiter and armature Hands Medium. Make sure wires are correctly aligned and attached to the field
4 Using the long screws, connect motor and commuter together # 15 Torque Driver/Phillips Screwdriver Hard. Needed to make sure all parts were aligned, which was difficult due to the lack of visibility
5 Attach trigger to the housing Hands Easy. Just place in the hole in the housing
6 Connect wires from straiter and armature to the trigger Hands Easy. Make sure that the wires are connected into the current holes
7 Connect cord to wires Hands Easy. Make sure that like wires are connected to each other and simply twist ends together
8 Screw wire clamp over the wires from the cord # 15 Torque Driver/Phillips Screwdriver Easy. Screws are easy to attach because of the high visibility of the parts
9 Attach reverse switch to housing Hands Easy. Slides into hole
10 Attach level to housing Hands Easy. Simply place in slot on top of housing
11 Attach level to housing Hands Easy. Slide into the hole in the housing
12 Attach bit holder to housing Hands Easy. Slide into hole on the housing
13 Fit top half of housing on top and screw two halves together # 15 Torque Driver/Phillips Screwdriver Easy but time consuming to screw in all the individual screws into the casing; also to properly align housing make sure that the wires are out of the way

After Assembly

Disassembly vs. Reassembly Discussion

The disassembly and reassembly process were basically the reverse of each other. It took less time to disassemble then to reassemble because during reassembly we had to make sure that everything was properly aligned. When the drill was disassembled it basically fell out of the housing once the two halves were separated. To reassemble the drill it took more time to properly align all of the components. The exact same tools were used for both disassembly and reassembly. The entire drill was able to be reassembled with relative ease but it is suggested that it is not used for an extended period of time because of the grease that was lost form the gears during the disassembly process.

Operation

The drill works by converting electrical energy from the AC power cord to mechanical energy to rotate the spindle and motor. The now mechanical energy allows the chuck to rotate and the drill to operate. Also, a magnetic field exists between the stator and the armature. This allows for a current to be produced in the field, which in turn produces a voltage that is controlled by the trigger. This control allows for the variable speeds of the drill. The commutator allows the drill to run on direct power (DC) instead on alternating (AC) power. It does this by periodically reversing the direction of the current produced by the motor. This produces rotational motion that is transformed along the spindle to the chuck. The reverse switch allows for the change in direction of the current which in turn changes the direction in which the chuck rotates. The fan on the spindle allows for the constant cooling down of the gears and other rotating parts.

Analysis Discussion

Thermodynamic analysis could be used to determine the threshold condition that will cause the drill to overheat and possibly start on fire. A working prototype of the drill or an actual drill could be used as the model for this test. Stress analysis could be used to determine the wear and tear on the chuck from repeated use. The model for this again could be a working prototype or an actual drill. Another type of analysis that could be is strength and durability testing on the plastic housing. This is important because the consumer does not want to buy a product that will break the first time it is dropped. A model that could be used for this is a working prototype.

Design Changes and Recommendations

One design change could be to have another handle on the drill along the chuck. This would provide more stability for the user because the center of mass is above the handle, making it top heavy and awkward to hold. This extra handle would allow for the user to more easily support the drill. This handle could also be removable so that a consumer who does not like this extra handle, or if the handle was to get in the way in a small space then it could be removed. This could be accomplished with clips on the casing that this extra handle could be attached. A second design change could be to have a cord that is retractable, this would allow the user to easily store the drill and not have cords tangle up. Another feature that could be changed would be to allow the chuck to fit various size bits. This would allow the user to customize the drill to their own specifications. This can be accomplished by having the option for the user to change the chuck so that a different bit sixe could be used. At a marketing standpoint this is a good ploy because the company will be able to make more money off of the different chucks that they sell. The product would also be more appealing to consumers too; they would like the idea that the drill has more features than other brands, as well as the idea that they can just use one drill for any size bit. Also the company could make the housing from recyclable plastic. This is a way to cut down on material cost for the company because they could recycle the plastic from old or broken drills. This could be accomplished by having consumers return their broken drills for a discount or some other marketing ploy. These could make the drill a more desirable product for consumers, which in turn would make the company more productive.

References

Black & Decker. (2003). Instruction Manual for Models DR201, DR202, DR211, DR220, DR403, DR501 and DR601. Towson, MD: Author.

Commutator (electric). (2006, September 18). In Wikipedia, The Free Encyclopedia. Retrieved 14:06, November 22, 2006, from http://en.wikipedia.org/w/index.php?title=Commutator_%28electric%29&oldid=76368620