One April 8, 2007
Tim, Josh, Tai, Alec, Arlen,
Campus human powered machines
- Washing machine (domes,
tri-coops, dorms, laundry facilities)
- Plot plow (student farm,
EC gardens, domes, tri-coops)
- Water pump (student farm,
EC gardens, domes, tri-coops, grounds)
- Roto-tiller (student farm,
EC gardens, domes, tri-coops)
- Kid powered carousel water
- Carousel (Orchard Park,
- Pedal powered desk: laptop,
ipod charger, etc (classrooms, student lounge, dorms, Bike Church)
- Giant salad spinner/greens
cleaner (student farm, ec gardens)
- Food processing: nut shellers,
butter makers, oil press (student farm, EC gardens, coffee house)
- Ice cream maker (coffee
- Fabrication equipment: drill
press, saws, lathes, grinders, sanders (craft center, domes, student
farm, machine shops)
- Pedal power exhibition:
demonstrates pedal at fairs, festivals, etc (picnic day, whole earth)
- Mobile radio station (KDVS)
- Pedal powered pickup truck
(TAPS, grounds, project compost, R4, Bike Church, Student farm, bike
- Bike pumps: air compressor
(Bike barn, bike church)
- Bike wash and lube (bike
barn, bike church)
- Car sized human powered
- Mobile bike rack: for bike
parking at events (whole earth, picnic day)
- Human powered bus
- Heavy duty trailers (TAPS,
grounds, project compost, R4, Bike Church, Student farm, bike barn)
- Party bike/Keg bike w/ keg
- Parade vehicles (KDVS, Bike
Church, Whole Earth, Project Compost)
- Billboard vehicle
- Pedal power demonstration
at admissions/entrance office
- Dishwasher (Coffee House,
- Edge trimmer (grounds)
- Compost turner (Domes, Tri
Co-ops, Project Compost)
Interview Assignments (due
Sunday April 15):
- Matt: Domes, Student Farm
- Arlen: Tri-Coops, Coffee
House, Aggie Pack
- Tai: EC Gardens, Project
- Josh: Bike Barn, Grounds,
- Tim: TAPS (David Takemoto-Werts),
- Ted: Whole Earth
Sign up for these other
places: Picnic Day, Campus Center for the Environment, ASUCD, KDVS,
Contact someone at these various
on campus facilities and see if they would be interested in pedal powered
Possible questions to ask:
- What low power tasks to
- Would they use a human powered
version if available?
- What machines do they have
that could be converted to human power?
- Do they perform any human
powered tasks already? Is it efficient?
- Would they be willing to
help fund the project?
Human powered machines around
town (let's contact these people!):
Second assignment (due Sunday
Find two human powered machines,
learn how they work, and share them at the next meeting. A picture or
diagram may be helpful.
Two April 15, 2007
Ted, Matt, Alec, Jason, Josh,
What machines did we learn
- Jason: Shared various machines
out of the books Bicycling Science and Pedal Power
- Arlen: Coffee grinder, Laptop
- Ted: Cargo bikes
- Josh: Generators, chargers
Campus interview results:
- Tri-Coops: coffee grinder,
any of the machines that we though of would be useful, they may be able
to provide some funding, they need a blender that can crush ice
- Coffee house: there probably
wouldn't be room for the food processing machines, but they are interested
in the charging desk
- Grounds: One electrician's
response to whether he would be willing to use a pedal powered truck
was "hell no!"
- ARC demonstration on collecting
energy from the machines to power the lights or add energy back to the
- Aggie pack soft object shooter
Top 5 Machines (we will choose
one next week):
- Charging desk
- Washing machine
- Trailer/Hauler/Pickup truck
- Kid powered water sprayer
Possible additional machines
that we can build:
- Salad spinner
- Coffee grinder
- Compost turner
Assignments (due next Sunday):
- Find critical components
for the top five machines. Depending on what we can find will help us
decide which machine to build.
- Things to find:
- Exercise bikes
- fly wheels
- Washing machine
- containers, tubs
for hauling bikes
- valves, water tubes
- coffee grinder
- Places to search:
- look in the free section, post wanted ads, also check the for
sale areas (we will try to find money for the parts)
- post wanted ads and search the list
diving - Davis Waste Removal on second has a metal dumpster
- Ask businesses for donations
- Matt work at the Yolo landfill and may be able to help us get
- Machine parts - McMaster
- Find out who else has built
similar machines. If you can find plans get copies. Learn how the other
machines worked or why they didn't work. Contact the inventors and see
if they have any tips. Send web links to the list serve (pedalpower
@ ucdavis.edu) so we know what has been found.
- Contact any of the campus
groups that you didn't talk to the first week
- Ted: Whole Earth, Project
- Matt: Student Farm (salad
spinner guy in the shop)
- Arlen: EC Gardens, Aggie
- Josh: Bike Barn, Grounds
- Tim: TAPS
Three: April 22
Matt, Jason, Alec, Josh, Robbie
- Matt: The student farm needs
a giant salad spinner and a way to transport stuff around the farm grounds.
They would like to have a pedal version of a john deer mule. They have
a large stainless steel colander for the salad spinner.
- Alec: The student farm will
most likely provide a space for us to work. We will need to take their
safety orientation before we can use the facilities. Currently the shop
is only open 4 days a week and possibly limited hours. There are a bunch
of plows that could possibly be used for a pedaled version.
- Josh: Josh's dad has some
inverters that we may be able to use. Josh and Tim checked out the prices
of inverters at Fry's and found them to range from $30 to $100 depending
on quality and wattage ratings.
- Alec shared some information
on velomobile design.
- Should we start a club similar
to the Antique Mechanics club, where we could continue to build pedal
- We could invite local (and
non-local) pedal powered enthusiasts to show off their machines.
sustainability grant (due April 27th): This has been applied for
once, but needs to be reworked and resubmitted.
- ASUCD: We need to send someone
to a meeting an request funds for the desk
- GSA: They have a projects
fund that we can apply for.
- PUFF: Presidental Undergraguate
Fellowship or something.
- Coffee house: can they provide
funds directly to us?
Time to choose one machine:
After the weighing of the pros
and cons of the top 5 machines we decided on the Pedal Powered Desk/Charging
Station for the coffee house! The reasons were because it is a multidisciplinary
machine with a good combination of industrial, mechanical, and electrical
design and will be seen by more people than the other machines.
We spent time developing a
well-defined set of design criteria for the pedal desk. These will keep
the team on the same page and allow us to narrow down our search for design
- power at least one laptop
(more devices if possible)
- exhibit uses of pedal power
- We should make this
a learning experience to let people know what, why and how about
- space for laptop, notebook,
- This should be a functional
desk that has room to hold the things you normally use at a desk.
- adequate pedaling space
- the leg room under the
desk should be a sized for all kinds of people. We don't want any
- adjustability for different
- Leg length for different
people and chair height should be addressed.
- comfortable for 30min to
- The user should be able
to "ride" the machine comfortably for at least one hour.
- have to pedal or power doesn't
- To prevent folks from
just using the energy stored in the batteries without adding any
back to the system.
- displays for charge level,
cadence, some way to know you are producing enough power
- displays for: instantaneous,
overall for machine life
- What amount of power
are you producing? How much power has been produced over the machines
- equivalent energy output
- how many hamburgers
did it take to produce that energy? How many pounds of CO2 did you
prevent from joining the atmosphere? This can be shown in the signage.
- signage: how much reusable
- Show how free and reusable
materials can be used to make a quality machine.
- fit through doors
- We must be able to bring
the desk into buildings. It may need to be able to separate into
- attractive, aesthetics,
nicest table in the coho
- needs to be quiet
- needs to be safe for the
user and surrounding people
- should withstand abusive
use from college students
What information do we need
to know to make the initial design decisions?:
- How much power does it take
to power a laptop?
- Tom Denton built a super
low power computer. He may be a good person to get some info from.
- How much power can one
- What is adequate pedaling
- What is appropriate pedaling
- What is the max power to
request from one person for a 30-1hour period?
- What is the surplus charge
that we can create?
- What parts and where to
get them? (inverter, generator, wood, gauges, leds, pedals, char, etc)
- What are the subsystems?
(ergonomics, mechanical, electrical)
We are all going to work collaboratively
on the design of the machine but we decided to divide the group up into
sub-teams so nothing gets neglected and there are folks that will be responsible
for each part of the machine. The groups will need to communicate well
with the other groups, because design changes in one group will almost
always affect the other groups' design.
- Ergonomics (Josh, Alec):
seating position, desk design, signage, aesthetics, adjustability for
size of rider
- Mechanical (Matt, Jason):
pedal mechanism, mounting for the components, provide mechanical energy
in appropriate form for the electrical components
- Electrical (Robbie, Tim,
Arlen): convert mechanical power to electrical, store the energy, make
lights and guages, choose appropriate components: dc generator, inverter,
- Answer the design questions
that are appropriate to your sub team (look at list above for ideas,
we will need concrete numbers)
- Everyone should come to
the next meeting with well defined design ideas (i.e. sketches, calculations,
- Continue looking for components:
the faster we find what we need the more defined the design will become.
Four: April 29
Alec, Robbie, Tai, Jason, Matt
Andrew Peake from the ASUCD
visited us and likes our idea. He is willing to help us get funding and
find a place to put the desk. He suggested we come pitch our idea to the
EPPC committee because they may have some funding. Arlen agreed to go
give them a short schpeel on our project. Andrew also told us to contact
Sharon Coulson the director of the coffee house. She will be able to give
approval on putting the desk in the coffee house.
Tai led the team in a design
session. We began by sketching individual ideas on large sheets of paper
and hanging them aroudn the room. Each person then described their designs
to team. After this we picked a partner and came up with design that encompassed
what we liked best in the previously presented ideas. Finally we attempted
at merging the final designs into one final design to work from, but this
didn't quite happen and left the design undecided.
Notes from Alec on design:
We talked about a lot of good
things at the meeting yesterday- hard to
summarize but I think we want to mock up a machine and produce power
with it to tell us:
a) that we can build a machine
such that it will produce the amount of
power we want without the user getting such a workout that they feel
like they are in the ARC.
b) that while producing this
power you could possibly simultaneously
use a laptop- this question bears on the position of the rider/diner.
A fundamental design bifurcation was uncovered yesterday, between the
machine as primarily a table, and the machine as primarily an
"efficient" power-generating unit that looks from 100 yards
an upright exercise bike or like a recumbent bike with a workstation
floating above it.
- test seating/typing positions
for comfort, efficiency, quietness, nonwiggle,etc and come to a final
decision on the configuration
- test out a generator to see how much power is produced in different
- take a look at the exercise bike Alec recovered and determine how or
if to use it
- some talk about the signage may be good (make a list of ideas and sketches).
This will be helpful to get funding
Five: May 6
No meeting but some work was
done at the shop. Tai's notes follow:
-The Cateye is disassembled
down to the functional pedal unit and on the table.
-Jeff and I cleaned up the space
-We will need an adapter to mount an alternator or generator out of the
-there are four main components rotating in the system:
--the 60 tooth (or so) chainring (singlespeed chain)
--a jackshaft with a freewheel on one side and a toothed belt gear on
--the resistance wheel from the toothed belt, which also has a smaller,
--flywheel connected to untoothed belt
we may want to pull out the
jackshaft, resistance wheel, and flywheel. use the jackshaft location
to put in a second chain gear, and drive a generator (mounted outside
of the box) with that. We would be able to get about a 8 or 10 to 1 gear
ration with that system, meaning that we could drive a 400rpm motor. if
we need higher rpm, we would need a second jackshaft mounted where the
resistance wheel or flywheel currently are.
The setup is possible to rotate
90 degrees to then become more appropriate for the vertical configuration.
all we would have to do is mount the seat by it's back, rather than it's
seat, and we could use all the same components (at least to test it).
The bolts I took out are on
the table next to the plastic covers.
Six: May 13
Seven: May 20
Alec, Josh, Matt, Tai, Jason
Connect the generator:
- Belt drive
- A sheave will be constructed
Monday for a 45 rpm cadence and 260 rpm motor speed and left at the
- Plywood base to attach the
pedal station and the motor. The motor will be mounted on rails to adjust
- We need a flat belt that
will fit the flywheel
- Alec has a desk that we
can use for basic mock-up
- Fabricate sheave (Jason)
- Bring desk to student farm
- See about weekend access
- Find a belt for the flywheel
to motor connection (Matt)
- Work on poster (Matt, Josh)
- Fabricate rails for motor
mount and deliver to the shop (Josh)
- Deliver a piece of plywood
to the shop for the base (Josh)
- Drop off cadence meter (Alec)
- Get a 12 volt auto style
female plug (Matt)
Other things to think about:
- Do we need a battery? If
so see if we can find one.
- Do we need cadence or voltage
read out to help regulate the pedaling?
- Do we need a fuse so we
don't fry the computer?
Eight: May 27
Worked on the pedal desk at
the Bike Church:
- attached motor,
- added a better seat
- built adjustable desk
- tested output wattage: