Purpose Of This Project: The purpose of this project is to learn how a Hammer Drill functions as well as learning and understanding how the mechanical and electrical parts inside it work together to do its function. We began with understanding how this tool is used in the real world and how it makes some jobs easier. The purpose of this drill was pretty clear on how it was designed to make it easier for its users to drill through harder surfaces.

Content

We began the project with taking the drill apart starting with removing the drills housing and taking pictures and making accurate drawings as we went along.

The electrical system and circuit is very simple It was made up a variable position switch, a brushed motor, and wires. All the components had a designed position inside the housing of the drill. The switch and button was made out of plastic. Most of the casing was made out of plastic as well help together with screws, although the handle had rubber around some parts for better grip.

Functional Analysis

Chuck: acts like a clamp - holds the drill bit or attachment in place on the centered axis. Tightened by a geared key which gives you some advantage

• The main job of the chuck is to hold the drill bit in place

• The chuck has 3 jaws which helps the drill bit to find the center of rotation which help the user drill in a straight line

• The jaws have a screw system which tightens when it is unscrewed holding the drill bit in place.

Isolated variable trigger switch: makes it easy to control the speed of the drill and helps to handle all the torque that is produced by the drill. Inside the trigger there is a variable resistor which controls how much current is flowing towards the motor

Gearbox: allows the motor to provide enough torque and power under the stress of the drill bit drilling through another item-gives the drill the option to work without the hammer function or to just work as a drill.

Mode selector switch: Switches between the hammering option and a drill mode.

Direction switch: The directional switch has contacts inside that redirect the path of the current to either turn the motor clockwise or counterclockwise.

• Redirects the current to control whether the drill spins clockwise or counter clockwise

Power cord: Connect the drill components to a power source such as an outlet.

Trigger lock button: Holds the trigger all the way down minimize stress on your fingers when drilling for an extended period of time.

Spindle: connect the the output end of the gearbox to the chuck of the drill

Housing: The main job of the housing is to store the main components inside it.

Brushed DC Motor: The job of the motor is to turn the electric energy into mechanical and magnetic energy to make the drill spin either clockwise or counterclockwise. The main parts of the motor are the stator which has a permanent magnetic field around the the rotor. There is also copper wire windings, the commutator, the brushes made out of carbon-graphite, the armature which supports the copper windings, and the commutator.

• Turns electrical energy into mechanical energy

• Spins clockwise or counter-clockwise

• Main parts are the stator which provide a permanent magnetic field around the rotor, the copper wire windings, the commutator, the armature which supports the copper windings, and the brushes which are made out of carbon graphite

Rotor:

• The windings around the armature provide a magnetic field

• The magnetic poles on the rotor will be attracted to the opposite poles of the stator

• Commutator at the end of the rotor makes contact with the brushes changing the polarity of the magnetic field depending on which part of the commutator the brushes sit on.

Structure Analysis

--Held together by screws and bearings

-Screw size M6x25

-Spindle (connects gearbox to the chuck(clamp))

-Cir-clips ( clips which prevent lateral movement of the gears )

-Oil seal(prevents lubricant escape) and seal ring

-Impact selector (which changes the mode from hammer to normal)

-Rotor(a rotating tool of an electromagnetic system in the electric motor which produces a torque around the rotors axis).

-stator( which uses electromagnets to spin the rotor).

Manufacturing Analysis

Each individual part of the drill is made of a material suitable to its function.

Housing: Polystyrene (moderately strong plastic)

Grip/handle: rubber to allow for friction in order to grip the tool.

Trigger: polystyrene with copper wings that conducts electrical current

Coils inside the stator and the rotor (create the magnetic field): copper for conductivity

Motor: aluminum

high speed steel

Plastic that holds everything in place inside the drill: Acrylonitrile butadiene styrene (ABS) plastic which is a common thermoplastic polymer

Conclusion

After completing this project we were able to work with our three group members by using a new system that we learned. This system is accomplished by using something called a Gantt Chart. We managed to completely understand how a hammer drill work and how all of the components inside it work together to complete it's purpose. Another thing we learned is how to effectively communicate as a team by sharing our ideas without any judgement. Because of this we were able to complete the project earlier than expected.

If we were to improve on any aspect of this project, I would want a more efficient way of sharing all the images we took to upload on our presentation. For my next projects I will create a file on drive for everyone to share all the documents that are meant for that project.