Black and Decker Dustbuster

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This device has been made by Black and Decker and is a cordless vacuum cleaner that is used to suck up unwanted waste and fine particles. This was one of the most successful vacuum cleaners ever made by the company. The function is accomplished by the vacuum inside which sucks the dirt through the nozzle into the holding chamber.


Some possible user requirements

  • Suction power – Want it to be large enough to collect all the extraneous particles
  • Size of nozzle(s) – may need a bigger/smaller one depending on different uses
  • Battery/Battery longevity – This is needed so it can be used without a cord and used for a good amount of time as well
  • Weight – Want the Dustbuster to be light enough so that a user’s arm does not get tired holding on to the Dustbuster for even short periods of time
  • Capacity of dirt chamber – want the chamber to have large capacity so that the holding chamber does not have to be replaced too frequently
  • Nozzle attachments – for different types of cleaning (wet/dry, big things/small, etc.)
  • Variable speeds – This is useful when cleaning different surfaces
  • Ease of replacement/cleaning of filter – This process should be as easy as possible
  • Release button (for nozzle) – want this to be easy to use and easy to find

Engineering Specifications corresponding to user requirements

  • Suction power – want it to be high (17 Airwatts)
  • Area of suction tips – need different sizes for different functions
  • Battery power/cord power consumption – correlates to suction power and battery longevity (9.6 Volts)
  • Capacity of filter – (402 mL)
  • Weight of the Dustbuster should be less
  • Volume of Dustbuster – would want it to be small and compact
  • Fluid suction – Is able to suck up to a certain maximum viscosity
  • Two level shaft speed – based upon changing resistances to raise or lower the power going to the shaft
  • Is a release button present and located easily? – Time saved in looking for the release button each time
  • Filter is lightweight and appropriate distances between inside wall of casing and outside edge of filter to allow for grip of filter leading to easy replacement of filter.


Listed below is the Bill of Materials for the Black and Decker Dustbuster:

Table 1: Black and Decker Dustbuster Bill of Materials
Part # Part Name Category Function Material Picture
1 Battery Pack Input Powers the vacuum. 8 Recyclable Rechargable Nickel Cadmium batteries with wire and metal connections.
Battery pack.JPG
2 Impeller Output Creates suction for the vacuum. Plastic
3 Motor with Fan Input Motor spins the impeller while the spinning fan pulls heat from the motor. Steel outer shell with a plastic fan and coils of copper wires
4 Speed controller Motion Conversion Element Allows for varying the speed of the motor and impeller. Plastic plates with copper connectors
5 Electric Circuitry Input Supplies the appropriate current to the motor. Plastic base with brass connectors and one resistor
6 Outer Plastic Casing Structural Components Protects the inner working parts and provides safety for the user. Plastic
7 Motor Shaft Transmission Connects the motor to the impeller and causes the impeller to turn when the motor does. Steel
8 Charging station Input Charges the batteries inside of the dustbuster. Plastic with metal connections

Deeper Look into Certain Parts


Nozzlefront.JPG Nozzleback.JPG

  • Decisions made for design:
    • Material
    • Capacity of filter
    • Volume
    • Weight/Density
  • Critical Features and Dimensions:
    • Cross-sectional area of inlet of nozzle
    • Cross-sectional area of outlet of nozzle
  • Loading:
    • Shear along the walls due to fluid flow
    • Loading from user
    • Vibrational
    • Impact loading from waste/dust particles
  • Measures to evaluate performance:
    • Suction power
    • Velocity at inlet



  • Decisions made for design:
    • Material
    • Size
    • Angle of blades
    • Number of blades
    • Optimal angular velocity
  • Critical Features and Dimensions:
    • Volumetric flow rate
    • Height of blade at both inside and outside
    • Angle of blade
  • Loading:
    • Torsional
  • Measures to evaluate performance:
    • Fatigue limit
    • Volumetric flow rate



  • Decisions made for design:
    • Material
    • Size
    • Resistivity
    • Max allowable current
  • Critical features and dimensions:
    • Dimensions of copper connectors
    • Dimensions of casing
  • Loading:
    • Electrical load onto pins
    • Load exerted when chaning positions
  • Measures to evaluate performance:
    • Reaction time between switching and power to the vacuum