1. Jig Saw Dissection By: Shayne Welsh

2. Jig Saw Objective –How the saw operates from battery to motor This type is also known as a reciprocating saw

3. Parts Power Source Trigger/Throttle Safety Switch Motor

4. Power Source Power source can be either a battery or plug Batteries range in voltage, depending on model –8V –14.4V Using a plug allows a larger motor, so more powerful saw Batteries are portable and are able to be used at any worksite

5. Trigger/Throttle The trigger acts as both an ‘On’ switch and a voltage regulator As the trigger is squeezed, the connection inside is completed, allowing energy to move from the battery into the motor The further the trigger is squeezed the more energy that passes at a given instant Causes the motor to accelerate by squeezing harder

7. Safety Switch Safety switches prevents saw from running when unintended Plastic object that prevents trigger from being pulled back unless it is moved to the side Spring loaded so it reset itself into the ‘safe’ position immediately after being let go

9. Motor Converts electrical energy to mechanical energy, electromagnetism Mechanical force on an wire when it is conducting electricity while contained within magnetic field –Perpendicular to both wire and magnetic field –In rotary motor Wires and magnetic field are arranged so torque is developed on rotary axis

10. Motor Rotating part is called the rotor Stationary part is stator Electromagnets are wound on a frame Armature –Part of motor which input voltage is supplied across –Can be either stator or rotor, depending on model

11. Motor Step 1Step 2Step 3 Magnetic field generated around armature, left side is pushed away form left magnet and drawn toward right Armature continues to rotate When armature is horizontally aligned, commutator reverses direction of current through coil, reversing magnetic field and process repeats

12. Conclusion Reciprocating saw operated by motor converting electric energy to mechanical energy

13. References http://www.defusco.com/Images/RS5.jpg http://en.wikipedia.org/wiki/Electric_motor# Operation http://cgi.ebay.com/ws/eBayISAPI.dll?Vie wItem&item=6013540126