-Last Lab
Wheels: Took off exterior of the rim of the wheel
Frame: Sandblasted the joints of the frame
Bottom End: Continued Disassembling
Clutch: Studied functions and assembly of a clutch on computer
Fasteners: Used CAD system to model parts
Top End: Continue cleaning parts; prepared head for sandblasting
–Dynamometers
-No load speed: 1200 RPM
-Pulley gets tightened and RPM slows down
-Radius of Pulley: 1 Inch
-Linear Relationship between friction force vs RPM (Negative Relationship)
-Torque vs. Speed Curve
-Peak of Power Curve = Half of Max RPM
-Power is lost through heating up the string
-String is applying friction to the rotating wheel
-Hill Curve
-Force vs. Velocity
-Bicycle Example: Applies to Transmission
-Optimal Velocity
-Power Curve: Force x Velocity
-Brake Components
-Tightening Bolt: Puts friction on the rotating bar
-It resists it tendency to turn
-It slows down the rotating shaft
-Power slowly decreases as force and velocity decrease causing the bike to stop
-Power up a hill
-Power= mgv
-PE= mgh
–Grading for the Course
-Precept Participation
-Commenting in Class
-Adding to Discussion
-Shop Class: Master of what you do in shop
-Function on your own
-Develop of shop skills
-Problem Solving Abilities in Shop
-Final Presentation: 60%
SCAS: Chapter 3
Motorcycle References:
-Valve Train: Chain, Sprocket, Cam:
-Used with more than one piston
-Controls which valve is in use
-More compression
-Alternative to push rod
-Valve Covers: Simply put, a part of the engine that covers the valves
-Kick Starter: Used as ignition system of motorcycle
-Oil Hand Pump:
-Manual Oil Distribution System
-Cast Iron: Holds oil well
-Intake Stroke: Stroke of the engine that brings air into the cylinder
-Throttle: Device for controlling power to engine, thus speed
-Choke: Controls the air flow into the carburetor, thus controlling the fuel to air ratio
-Spark Timing:
-Spark Advance
-Faster the rotor spins: The more the spark would advance
-If to fast: Can reverse the engine
-Used to be manually adjusted
-Determines when the spark is set
-Foot Peg: Peg where rider puts feet while riding
-Exhaust Stroke: Final stroke of an engine in which burned fuel (H20 + CO2) is released
-Dipstick: Measure amount oil that’s in the oil tank
SCAS Chapter 3 Discussion: (Key Points)
-In effort to make people more independent from technology (automating processes) people become more dependent: Freedom from necessity of fixing and problem solving.
-Lack of Freedom
-Inability to fix or understand the technology we have
-We are dependent on others to fix technology for us
-In an effort to make it more user friendly, we are no longer able to fix
-Can’t do anything if technology breaks down
-Two Types of viewing technology
-Classical: Fix your own technology, you can control your technology
-Romantically: Technology has control over you
-Represent two different types of approaching technology
-Everyone is a mix of both
-Desire for individuality
-Customization of technology
-People want to feel like they are part of the process
-Enjoy the process more than the product
-Takes away problem solving ability
-Limited to predetermined process
Assignment: Read Chapter 7 and 8 of Zen and Art of Motorcycle Maintenance