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CCAT bike blender 2015

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CCAT 2015 Bike Blender mounted on a partial stationary bike

Abstract[edit]

The CCAT Bike Blender 2015 was constructed as a class project by students of Humboldt State University's Engineering 305: Appropriate Technology class. It is a mechanical, interchangeable design that can be mounted on many different bicycles, rather than being permanently attached to one stationary bike. This bike blender works by using the rotation of the bicycle's rear wheel to turn a vertical shaft which rotates the blender blades. It works very well for making smoothies and is relatively simple to construct.

Background[edit]

Students Bryce Goldstein Goldstein and Carley Bramhill designed and built a bicycle-powered blender to be used and displayed at CCAT, located at Humboldt State University in Arcata, California, United States of America. The project is part of Lonny Grafman's ENGR 305: Appropriate Technology class in the Spring semester of 2015 (January - May). CCAT’s original bike blender was built in 1997 by consultant Bart Orlando and student Saramie Williams, and it was used at CCAT and campus-wide events [1]. Unfortunately, this icon of appropriate technology has since been broken and lost. CCAT would like to have another bike blender built to demonstrate the use of pedal power.

Problem statement[edit]

The objective of this project is to design a bicycle powered blender, to be displayed and utilized at the Campus Center for Appropriate Technology (CCAT), at Humboldt State University in Arcata, California, USA. This iteration will be mechanical in design, translating the momentum generated by pedaling the bicycle directly to the operation of the blender. The intention is to keep the design as simplistic as possible, in order to improve efficiency, as well as ensure that any future maintenance can be performed by any adult, with or without mechanical expertise.

Project Evaluation Criteria[edit]

The following criteria will be used to evaluate potential designs and choose the most appropriate one for this project. These criteria were chosen based on the suggestions of our CCAT contact on this project, Julian Quick, as well as Bart Orlando, who is kindly assisting as an external adviser. The scale (1-10) represents the weight of consideration (from least to most) for each of the listed criteria.

Criteria Constraints Weight
(1-10)
Functionality and Stability When pedaled, the blender should stay firmly in place, while blending fruit and ice in a reasonable amount of time.
10
Safety Must be safe to operate, including both blender and bike sections.
10
Education Must demonstrate the use of pedal power.
9
Ease of Use Can be operated by one person without assistance.
9
Maintainability A person with low-average mechanical skills should be able to maintain and repair it.
8
Cost Must cost less than retail for commercial alternatives.
6
Reproducibility Design should be relatively simple, using easily acquired components.
6
Aesthetics Must look appealing enough to display.
4

Literature Review[edit]

The following is a brief review of the available literature and web resources pertinent to the CCAT Bike Blender 2015.

Bike Blender Basics[edit]

Pedal power is a technology that is common in most of the world. It is used for transportation, and in some cases electricity generation or mechanical work. [2] Pedal power is useful because bicycles are designed to hold a large amount of weight and transfer humans' kinetic energy into low-friction mechanical energy. According to the literature reviewed by a past bicycle blender project team, "an output of 71 watts can be sustained for 60 to 120 seconds at 90 rpm" by an untrained adult male pedaling. [3] One purpose of a bike blender is to replace an energy-intensive regular blender with a more sustainable method of making smoothies. A bike-powered blender can also be used as an educational tool as well as an appliance. It can demonstrate the use of pedal power, and also get kids interested in healthy living. [4] [5]

Bike Blender Concerns[edit]

A bike-powered blender may sound like a silly idea to some. Why would we put energy and resources into an appliance that only has one function? We are building the bike blender as a way to demonstrate the alternative uses of bicycle parts and human power, rather than make a product that would be desirable to everybody. Also, electric-powered blenders run off of grid electricity, which is typically generated from non-renewable sources such as coal or natural gas.

Types of bike blenders[edit]

The are multiple types of bike blenders. There are advantages and disadvantages to each, as described below.

Mechanical[edit]

Mechanical bike blenders use mechanical energy to run the blender directly, as opposed to running a motor. Mechanical bike blenders generally have less parts and are easier to maintain without advanced knowledge.

Electrical[edit]

Electrical bike blenders convert mechanical energy into electrical energy to run the blender.

Mobile[edit]

Our bike blender is mobile, meaning that the bicycle can be ridden as a normal bike if the blender stand is removed. The mobile bike blender can also be fitted to many different bikes, and is relatively easy to transport. Our design will use some of the ideas and materials presented in Foodshare.net's "Build Your Own Bicycle Powered Blender" video. [6]

Stationary[edit]

Some bike blenders are stationary, meaning that the whole system is built onto a stationary bike. Because ours is intended for display and education, we at first decided that a stationary bike would be easier to build and would be sturdier. Another advantage of the stationary bike blender is that we can attach a table or tray to the front of the system so that the operator can set down materials that are to be blended. However, our clients decided that a mobile blender would better suit their needs, so that is what we built.

Designing interpretive materials[edit]

CCAT did not ask for any interpretive materials. Based on other projects at CCAT, it could be beneficial to have a sign explaining how to operate it safely and why it is relevant to appropriate technology and the purpose of CCAT. [7]

Proposed timeline[edit]

This timeline was intended as a guide so we knew what we should be working on at a certain time in the semester. It also allowed our client, CCAT, a glimpse at how we planned to accomplish our project goals within the time allowed.

Week of semester (date) Task Description
1 (January 19 2015) Project options pitched Lonny told us about the options for projects
2 (Jan. 26) Project selection, teams formed We chose the bike blender and went to CCAT to begin research
3(Feb. 2) Explore options and site of project We went to CCAT to look at their bike parts and talk to employees about criteria and specifications.
4 (Feb. 9) Further research We went to CCAT to test their stationary bike parts for functionality. We also learned where their tools and materials are kept.
5 (Feb. 16) Pitch design options to client We presented the options - stationary "smoothie bar" or detachable, portable pedal blender - to CCAT and they chose the latter.
6 (Feb. 23) Research mobile blenders Do further research, focusing on stability and ease of attachment to various bike models. Also figure out costs and budget.
7 (Mar. 2) Design, gather materials Make plans and designs. Go shopping, order things, continue research.
8 (Mar. 9) Start building Continue acquiring parts and begin putting things together.
9 (Mar. 23) Build and troubleshoot By this time we should have started putting the pieces together and have an idea of what won't work.
10 (Mar. 30) Testing and troubleshooting Continue building, be frustrated.
11 (Apr. 6) Design interpretive materials Make plans for signage, instructions, etc.
12 (Apr. 13) Various work Tweaking blender design, if necessary, designing and getting materials for interpretive materials.
13 (Apr. 20) Various work Building blender, creating interpretive materials.
14 (Apr. 27) Complete blender The blender should be completed at this time. Work on interpretive materials.
15 (May 4) Complete interpretive materials Finishing touches to blender and interpretive materials.
16 (May 11) Have everything completed Make things pretty and presentable

Costs[edit]

This is our budget for the project. It includes costs for materials based on prices we paid, assumed cost if a team member had not already owned a material, and some materials that were free from CCAT or sources of scrap. CCAT has a $200 budget for our project, so we needed to have the total cost be under this amount. Additionally, a commercial version of this device currently retails at $250. So, the optimal cost of production for our version was determined to be well below that value.


Quantity Material Source Cost ($) Total ($)
1 Blender Thrift Shop 6.00 6.00
1 Bike storage rack Retail 23.00 23.00
1 drill chuck Retail / scrap 10.00 10.00
1 Bike trainer stand Ebay 50.98 50.98
assorted nuts/bolts/etc Hardware store 10.00 10.00
1 Scrap wooden board free 0.00 0.00
1 Skateboard wheel free 0.00 0.00
Total Cost $99.98

Construction[edit]

We built the bike blender using the materials listed above. The following table shows our construction methods.

Instructions
ImageStep
Caption Step 1 : Choose what kind of bike blender to construct. CCAT had these old stationary bikes sitting outside in their scrap pile, which we recognized as the remains of past projects. We did not end up using these bikes, as we ended up making a mobile design. Instead we purchased a bike storage rack and a trainer stand, which will attach to a regular street bike.
Caption Step 2 : Optional: Disassemble your blender's original base. This will help you understand how it works, and you will use some of the internal parts in the construction of the new base.
Caption Step 3: Take apart this piece from inside the blender base. One side of the outer bracket can be screwed into the wooden base to hold the drive shaft in place, as shown in the next step.
Caption Step 4 : Cut the wooden board to fit the bike rack, and then cut a round hole in the wooden board the size of the skateboard wheel. This hole should go slightly to the left of the middle, by about a half inch. Ours was drilled in the center, which was a mistake. One half of the metal brackets from the previous step should be screwed into the board so it sits centered over this hole. Then begin to assemble the drive shaft using a metal rod, drill chuck, and blender coupling and rectangular coupling piece (pictured at the very top).
Caption Step 5 : Put together the rest of the drive shaft, with the drill chuck on one end and the blender coupling on the other end. It is not fully assembled in this photo, as we were experimenting with attaching different cylindrical pieces to the drive shaft. The skateboard wheel's center bearing is removed so that the rod can be placed inside so it rotates freely. The wheel is then glued into the hole in the board.
Caption Step 6: The pitcher base (we used a steel base) is then screwed to the board. It should be centered over the bracket and wheel so that the drive shaft sticks up through the top where the blender coupling attaches to the rectangular coupling piece, an unattached metal piece that should be kept in the parts storage bag when not in use. The board is then glued or screwed onto the bike rack so that the drive shaft fits through the bars.
Caption Step 7: The finished product, shown from the underside. Underneath the blender base you can see the drill chuck, which presses against the bicycle tire and rotates the blender's drive shaft when the wheel spins. We got the idea to use a drill chuck from Foodshare.net's video [6]

Operation[edit]

Operation Instructions
ImageStep
Caption Step 1 : Put the back wheel of the bicycle up on the trainer stand.
Caption Step 2: Attach the rack/base assembly to the bike using the screws in the bag labeled "bike blender parts". The drive shaft should be placed firmly against the left side of the tire.
Caption Step 3 : Put this coupling piece in the hole at the top of the base, and set the blender pitcher on top of it.
Step 4 : Place ingredients in blender pitcher, and replace the lid. Now you can get on the bike and start pedaling.
Step 5 : Enjoy your smoothie!


Maintenance[edit]

The bike blender will need to be stored in a location where it will not rust, and where all the pieces can be kept together and not get lost. Also, the pitcher component should be washed after use to keep it clean and sanitary. Of special concern are the small parts including the screws and the coupling piece. They are in a plastic bag labeled "Bike blender parts". The coupling piece could be especially easy to lose if somebody leaves it in the blender base while transporting it.


Schedule of Maintenance[edit]

We did not develop a regular schedule for maintenance, as this project will most likely only need to be maintained whenever it is used.

Conclusion[edit]

Testing results[edit]

Everything works!!! Just turning the pedals on Carley's bike around once made the blender blades spin very quickly and loudly. Carley tested it with a small amount of ice, and it was able to crush the ice and produce a good smoothie. We recommend using crushed ice for future smoothies to ensure that there are no lumps and that you don't put to much strain on the blender.

Discussion[edit]

In the end, we created a very cool bike-powered blender that didn't cost very much money or take a lot of specialized experience or tools to construct. The hardest part was trying to find a cylindrical piece to transfer the rotation of the bike wheel to the rotating axis of the blender. The drill chuck worked very well for this purpose. Also, we tried to make our design a little bit different than all the previous bike blenders we found in our research, so we didn't have any specific instructions to rely on. This meant that the blender was sometimes hard to design, and because we used parts from scrap it could be difficult to replicate exactly.

Lessons learned[edit]

We learned a lot about bicycles and blenders. Neither of us had much experience with either thing, aside from the typical uses. When we took apart the blender we were fascinated by the inner workings. Also, we were surprised by how complicated it is to find pieces that would work for the project, as mentioned above.

Next steps[edit]

In the future, CCAT may wish to have interpretive materials to accompany the bike blender. A sheet describing instructions and maintenance would be especially beneficial. Hopefully CCAT will keep our emails in their files and will contact us if they need assistance with this. I also hope to see the bike blender used at future events!

Troubleshooting[edit]

Problem Solution
Pitcher does not attach to base Use blender coupling piece. It is small and should be found stored with the other small parts (screws, etc.) in a bag. Don't lose this piece! We didn't attach it because we were advised that it would work better without being glued down.
How do I attach it to a bike? See instructions.
Blades do not spin Check to make sure drill chuck is firmly against bike tire. Also make sure the coupling piece is connecting the blades to the base. If those are in order, maybe there is something blocking the blades from spinning.
All else fails Search the internet, or contact Bryce or Carley.

Team[edit]

Spring 2015

References[edit]

  1. Projects with Bart
  2. McCullagh, James C. "Pedal Power in Work, Leisure, and Transportation"
  3. Bike Rodeo bicycle blender
  4. Public Health Bike Blender
  5. Arizona 4-H and UnitedHealthcare Expand "Eat 4-Health" Partnership; Use "Pedal Power" to Help Youth Tackle Obesity and Encourage Healthy Lifestyles. Hospital Law Weekly. 3. 2014.
  6. 6.0 6.1 FoodShare.net's Build Your Own Bicycle Powered Blender video [1]
  7. Pedal Power Binder at CCAT

Other Useful Sources of Information[edit]

  • Hazeltine and Bull, "Field Guide to Appropriate Technology" pp. 612-614
  • Congdon, R.J. 1977. "Introduction to Appropriate Technology - Toward a Simpler Lifestyle." Rodale Press.
  • Paul, Terrance D. "How to Design and Build and Independent Power System" 1981, Best Energy Systems for Tomorrow, Inc.
  • Grose, Thomas. 2009. Pedal Power. ASEE Prism. 18, no. 8: 16.
  • 2007. Bicycle Blender Means a Quick Ride for a Drink: 2 Edition. The Nelson Mail. 15-14.