Survey for the next Iteration

The last year was very exciting for us. We built a stair climbing wheelchair from scratch and received great feedback from all over the world. We were featured in numerous blogs, newspapers and TV shows. Our video got almost 2 million views and we won the National Instruments Student Design Competition as well as the iCreate Singapur Student Innovation Challenge.
We want to build upon this success and develop the Scalevo wheelchair further to make it even better.

We’d like to know what you think of the Scalevo wheelchair and how to make it better. This way we can already use your inputs in our new design. The survey takes about 10 minutes to complete and it would help us a lot if you took the time to complete it. We thank you already for your efforts!

 

Complete the Survey here!

 

With your inputs we want to build a second version of the Scalevo wheelchair. We want to focus especially on making it safe, robust and affordable. Cybathlon 2016 gives us a great opportunity to verify the first two qualities: safety and robustness. We want to win the challenge and show everyone how versatile our wheelchair is. Then we want to work another year on the chair to build the third iteration: an affordable solution.

 

Rollout in ETH Zürich main building

The rollout presentation of our project was a huge success! The wheelchair was demonstrated to the public in the main building of ETH Zürich. A wooden stair was used show how the stair climbing process works. We are currently working on increasing the speed “step by step”. The goal is to reach a speed of 1 step / second which is the maximum possible by our current hardware configuration.

SRF1 – Einstein TV Show

During the past two weeks the Swiss national TV visited us at out headquarters to film our project. They were very interested in our project and showed it in a show called “Einstein”. It was a nice experience to work with the regisseur and camera crew during the two days of shooting the film.

 

 

Thanks to Peter Höllrigl for this cool documentation of our current state in the project.

Prototypes

The goal of our project is to develop and build a powered wheelchair in 10 months. This requires a tight timetable and there is not much room for errors. As a result of this timeframe it is not possible to make a prototype of each module to make sure it is working properly. These modules are: chair, frame, battery system, support system, balancing, tracks, tilt mechanism and drive chain.
We sorted the systems according to their risk and impact on our final system. We decided to build and test the three most critical systems which are crucial for a successful product. These are the balancing system, the clutch and the tracks.

 

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The balancing system shall consist of a Segway-like construction. We wanted to use as many of the final parts as possible. This means using a chain to drive the wheels, the motors and controllers as well as the IMU planned for the final version.

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The clutch prototype shall consist of the clutch, a servo motor and an encoder as well as a drive motor. We want to figure out if using a single lever has enough force or if additional constructive measurements have to be made. Also we want to read if the clutch is opened or closed using the encoder built in the servo motor.

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The goal of the track prototype is to test the behaviour on the stairs. We calculated the required strength and made estimations for the friction coefficient. Nevertheless it is important to compare this theoretical values with practical experience. For this reason we manufactured a prototype which takes advantage of the tensioning mechanism and the tracks we ordered. For propulsion we used replacement motors from Maxon which give us the same torque as the final ones but at a lower speed.

Focus Project

Focus projects are projects for students of mechanical engineering in the last year of the bachelor. Sometimes students of electric engineering join them to help with the electronics. In most of the projects the goal is to build a prototype of a product you could sell. To achieve that there are also industrial designers from the ZHdK that help build the prototype.

The main purpose of those projects are the didactic. In some projects there were also patents applied.

This is a list of some focus projects from the ETH: