Group 3 - Black and Decker Drill
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Revision as of 11:40, 20 November 2006
Contents |
Executive Summary
We disassembled, analyzed, and reassembled a Black & Decker 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 the component was. We also produced CAD drawings and pictures of each component. After all this information was gathered we reassembled the drill.
Assembly was
After we disassembled, analyzed, and reassembled the Black & Decker power drill we gained a better comprehension of how the drill works.
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.
Each member was responsible for the following parts of the project:
Lazarus,Shawn ()
Sendlak,Christopher ()
Davis,Angela ()
Tewes,Jennifer ()
Theresanathan,Jerry()
Before Disassembly
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.
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:
- Motor
- Trigger switch
- Cord
- Drill bit
- Level
- Cooling fan
- Casing
- Direction switch
- Trigger lock
- Chuck
- Screws
- Gears
Types of Materials
We estimated that the drill is made of approximately five materials. These five materials include:
- Plastic
- Rubber
- Steel
- Copper wiring
- Water (Liquid in level)
Disassembly Procedure
Disassembly Process Table
| Step Number | Process | Tool | Level of Difficulty |
|---|---|---|---|
| 1 | Unscrewed screws to remove plastic casing (housing) | Phillips Head Screwdriver | Easy |
| 2 | Removed electrical cord by unscrewing screws | Phillips Head Screwdriver | Easy |
| 3 | Removed reverse switch that fits into hole at the base of the motor | Hands | Very Easy |
| 4 | Removed circuit box and its parts (two springs, metal strips, wires, silicon chip) | Pliers and Alan Key | Hard |
| 5 | Separated drill bit, motor, gears, and magnetic field | Hands | Easy |
| 6 | Separated and removed small magnets | Hands | Easy |
| 7 | Unsnapped plastic casing around magnetic field | Hands | Medium |
| 8 | Unscrewed large screws on magnetic field | Phillips Head Screwdriver | Easy |
| 9 | Unlocked the wire locks | Hands | Easy |
| 10 | Removed plastic ring that included two wires | Hands | Easy |
After Disassembly
Part Table
| Part Number | Part Name | Number of Parts of This Type | Part Material & Reason for Material | Function | 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 |  |
-- | |
| 2 | Screws | 11 (Casing Screws) 2(Long Screws) | Metal Strength and longivity of part |
Holds separate components together | -- |  | |
| 3 | Level | 1 | Plastic (externally) Strengh and durability Liquid (internally) To allow for the bubble to balance in the liquid |
Shows the user if the drill is being held horizontally | -- |  | |
| 4 | Keyless Chuck | 1 | Plastic (externally) Comfort of use for user Steel (internally) Stenght and longevity |
Place for the bit to be held | -- |  | |
| 5 | Wiring | 1 | Copper Conductor of electricity Plastic (insulation) Shield other components from electricity |
Supplies power to components | -- |  | |
| 6 | Cord | 1 | Plastic (externally) Shield user from electrcity Copper wiring (internally) Conductor of electricity |
Supplies power to the whole drill | -- |  | |
| 7 | Trigger | 1 | Plastic Sheild user from electricity on the inside |
Contolls the speed | -- |  | |
| 8 | Chip | 1 | Silicon Condutor of electricity and computational power |
Controls the power supply | -- |  | |
| 9 | Armature | 1 | Copper Conductor of electricity |
Allows for the generation of power | -- |  | |
| 10 | Commutator | 3 | Metal Strength and durability |
Allows tranfer of electricity in the coil of the central axis | -- |  | |
| 11 | Reverse Switch | 1 | Plastic Strength and comfort for user |
Changes the direction that the chuck rotates in | -- |  | |
| 12 | Spindle | 1 | Metal Strength and durability |
Allows for motor rotation | -- |  | |
| 13 | Cooling Fan | 1 | Plastic Light weight and durability |
Draws air into the drill to cool down the motor | -- |  | |
| 14 | Field | 1 | Copper Conductor of electricity |
Allows for power genetration from the motor | -- |  | |
| 15 | Rotary place holder | 1 | Metal Strength and longevity |
Regulates the rotation of the spindle | -- |  | |
| 16 | Straiter | 1 | Metal Conductor of electrcity |
Facilitates transfer of power from the coil | -- | | |
| 17 | Cord Clamp | 1 | Metal Durability |
Holds the cord in place | -- |  |
-- |
| 18 | Casing of copper coil and metal rings | 1 | Plastic Light weight and non-conductor of electricity |
Protects and insulates the coil | -- |  | |
| 19 | Contact Points | 4 | Metal Strength and longevity |
Connects wires to coil | -- |  | |
| 20 | Brushes | 2 | Carbon Longevity to withstand repeated friction |
Contact commuter for reverse | -- |  | |
| 21 | Brush Holders | 2 | Metal Strength and longevity to withstand friction |
Hold the brushes stationary | -- |  | |
| 22 | Coil Springs | 2 | Metal Conductor of electricity |
Regulates power supply to the brushes | -- | | |
| 23 | Gear and Pinion | 3 | Metal Strength and Durability |
Transfers motion to the chuck | -- |  |
 |
| 24 | Plate | 2 | Metal Strength and longevity |
Holds the gears in place | -- |  | |
| 25 | Cloth Washer | 1 | Cloth Good cushion to prevent parts from rubbing together |
Reduces friction due to the rotating gears and chuck | -- |  | |
| 26 | Magnetic Insultator | 1 | Cardboard Insolator |
Insulates the copper coil from outside interference | -- |  | |
| 27 | Circuit Box | 1 | Plastic Insulator of electrcity |
Controlls the speed of motor | -- |  |
Assembly
Assembly Process Table
| Step Number | Process | Tool | Level of Difficulty |
|---|---|---|---|
| 1 | Connect Chuck to Gears and Plate. Place in Housing | Hands | Easy |
| 2 | Attach Brushes into Brush holders | Needle nose pliers | Hard. Needed to pull springs back to attach brushes |
| 3 | |||
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