Bill Becker Talk
Lab Updates:
Bottom End: Cleaned parts, tested the threads on the engine case, finished the gasket, flywheel: It ended up being off.
Top End: finished cutting the valves, ready to assemble the top end.
Frames, forks and wheels: Priming the triple tree, found all the parts for the wheels, cleaned the bearings out. Finished sanding the nacelle.
Electrical: looked at the rectifier and the switch.
Who is he?
Retired architect now builds motorcycles. Recently finished 1961 ducati
His talk:
– Principals of engineering
– Motorcycle wheel involves a lot of different principles
– 1. Physics: Mass related to the weight of objects. Property called mass and we can define how objects behave according to their mass.
– Weight is not your friend because you are fighting the mass of the objects.
– Materials that are involved in the wheel:
- o 11 materials in the wheel.
- o Picking materials is like picking an Olympic team. Diversity.
– Properties to be concerned with when it comes to materials:
- o Strength, flexibility, weight hardness and softness, workability, conductivity, cost, availability
– The hub:
- o Made out of aluminum.
- o Properties: it is lighter than steel, cheap, castability, doesn’t rust.
– The spokes:
- o Made out of stainless steal.
- o Properties: Does not rust. Steal is a very strong material.
– Cast Iron:
- o Properties: pores, stays lubricated, cylinder head made out of cast iron because it is a very good conductor of heat
– Rim made out mild steal
– Tire made out of rubber:
- o it is flexible, gas inside of inner tube in the tire. Inside tire is polyester
- o Steel cable is casted into the rubber.
- o Ball bearings are steel.
Strength of materials:
– Basic forces acting on structural elements
- o Compression (squeezing)
- o Tension (stretching)
- o Bending (resolution of compression and tension)
- o Shear (cutting/tearing force)
– Forces acting on a wheel
- o Gravity
- o Impact
- o Acceleration
- o decel/breaking
- o Turning forces
– When you push down on the axel top spokes are getting stretched and bottom spokes are getting squeezed
– Spoke is only good at being stretched, very strong
Next Weeks Reading Assignment:
Combustion chemistry and tiger cub calculations documents found in the data section of our webpage
Next scribe: Mariana
Hilary Lloyd