Group 3 - Black and Decker Drill

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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:

  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) 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
MAE pics 007.jpg
--
2 Screws 11 (Casing Screws) 2(Long Screws) Metal
Strength and longivity of part
Holds separate components together --
MAE pics 062.jpg
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 --
MAE pics 055.jpg
4 Keyless Chuck 1 Plastic (externally)
Comfort of use for user
Steel (internally)
Stenght and longevity
Place for the bit to be held --
MAE pics 039.jpg
5 Wiring 1 Copper
Conductor of electricity
Plastic (insulation)
Shield other components from electricity
Supplies power to components --
MAE pics 061.jpg
6 Cord 1 Plastic (externally)
Shield user from electrcity
Copper wiring (internally)
Conductor of electricity
Supplies power to the whole drill --
MAE pics 052.jpg
7 Trigger 1 Plastic
Sheild user from electricity on the inside
Contolls the speed --
MAE pics 054.jpg
8 Chip 1 Silicon
Condutor of electricity and computational power
Controls the power supply --
MAE pics 013.jpg
9 Armature 1 Copper
Conductor of electricity
Allows for the generation of power --
MAE pics 037.jpg
10 Commutator 3 Metal
Strength and durability
Allows tranfer of electricity in the coil of the central axis --
MAE pics 038.jpg
11 Reverse Switch 1 Plastic
Strength and comfort for user
Changes the direction that the chuck rotates in --
MAE pics 053.jpg
12 Spindle 1 Metal
Strength and durability
Allows for motor rotation --
MAE pics 034.jpg
13 Cooling Fan 1 Plastic
Light weight and durability
Draws air into the drill to cool down the motor --
MAE pics 030.jpg
14 Field 1 Copper
Conductor of electricity
Allows for power genetration from the motor --
MAE pics 041.jpg
15 Rotary place holder 1 Metal
Strength and longevity
Regulates the rotation of the spindle --
MAE pics 033.jpg
16 Straiter 1 Metal
Conductor of electrcity
Facilitates transfer of power from the coil --
MAE pics 037.jpg
17 Cord Clamp 1 Metal
Durability
Holds the cord in place --
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 --
MAE pics 060.jpg
19 Contact Points 4 Metal
Strength and longevity
Connects wires to coil --
MAE pics 043.jpg
20 Brushes 2 Carbon
Longevity to withstand repeated friction
Contact commuter for reverse --
MAE pics 056.jpg
21 Brush Holders 2 Metal
Strength and longevity to withstand friction
Hold the brushes stationary --
MAE pics 046.jpg
22 Coil Springs 2 Metal
Conductor of electricity
Regulates power supply to the brushes --
MAE pics 046.jpg
23 Gear and Pinion 3 Metal
Strength and Durability
Transfers motion to the chuck --
MAE pics 058.jpg
Small Gear Assembly.jpg
24 Plate 2 Metal
Strength and longevity
Holds the gears in place --
MAE pics 063.jpg
Small plate.jpg
25 Cloth Washer 1 Cloth
Good cushion to prevent parts from rubbing together
Reduces friction due to the rotating gears and chuck --
MAE pics 028.jpg
26 Magnetic Insultator 1 Cardboard
Insolator
Insulates the copper coil from outside interference --
MAE pics 045.jpg
27 Circuit Box 1 Plastic
Insulator of electrcity
Controlls the speed of motor --
MAE pics 016.jpg

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
4
5
6
7
8
9
10

After Assembly

Operation

Conclusion

References