Final project main page
Table of Contents
Questions
1-What does it do?
Skit is an electric ski, that is, a pair of skis that move with the assistance of an electric motor. The electric motor moves a caterpillar that pushes the ski from behind.
The final goal is to be able to ski on places without lifts:
1-On flat surfaces, to go from one place to another.
2-On slopes, to go up with the motor and go down freely.
The utopic final goal will be to avoid ski lifts on the mountains, and it would be great to combine with solar panels to have a completely clean energy.
2-Who's done what beforehand?
To my knowledge, nobody did that before. There are some similar products, but nothing integrated on a ski:
As DIY projects, the more similar I found are some electric snowboard projects:
Eltrack Mover, by Illia Muchkin
Home made electric snowboard, by Homemade Mehanol
Shilskii, by Tima Shamalo
What have you designed?
I designed the logo, the ski shape and wooden core, the hand controller, the caterpillar, system integration and packaging.
What parts and systems are made?
1-Vinyl logo
2-Hand controller
3-Electronic for PPM controller and Display
4-Pair of skis
5-Caterpillar
6-Integration case
What processes have been used?
Vinyl cutting for the logo
Laser cutting for the model and the caterpillar template
CNC machining for the ski press, wooden core and caterpillar plates
3D printing for the hand controller, gears and different wheels
Electronic board CNC milling
Embedded programming for the controller
Composite making for the ski blades
Molding and casting for the caterpillar pieces
What questions need to be answered?
1-Is it feasible to make an electric ski?
2-Will it work?
3-Will it be useful?
How will it be evaluated?
As the project is planned as spiral development, the evaluation has to be also spiral, based on the different steps:
1-The prototype of one ski moves properly. The battery, the electronics, the controller, the motor and the caterpillar are integrated and move following the throttle.
2-A second ski is made and works as described in point 1.
3-The skis move on the snow without a person on them.
4-The skis move on the snow with a person on them.
Materials and components
Skit piece | Part | Number | Unit price (€) | Total price (€) | url to buy |
Controller | PLA 1.75mm | 2 | 26,99 | 53,98 | |
Potentiometer | 1 | 16,95 | 16,95 | https://www.digikey.es/es/products/detail/precision-electronics-corporation/RV4NAYSD353A/265527 | |
OLED display | 1 | 9,49 | 9,49 | https://www.amazon.es/AZDelivery-128-160-p%C3%ADxeles-91-OLED/dp/B078J78R45/ref=asc_df_B078J78R45/ | |
Springy | 1 | 0,1 | 0,1 | https://www.amazon.es/gp/product/B08N17D9TJ/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 | |
Skit piece | Black base | 4 | 5,04 | 20,16 | |
Steel edge | 4 | 3,36 | 13,44 | ||
Fiberglass 32 cm | 4 | 2,94 | 11,76 | ||
Ash wood core 198x15 | 2 | 22,69 | 45,38 | ||
Epoxy resin | 1 | 21 | 21 | ||
Inserts M6 | 24 | 0,59 | 14,16 | ||
Recycled old ski bindings | 0 | ||||
Aluminum profile 30x30 1m | 1 | 5 | 5 | https://www.leroymerlin.es/fp/72191/perfil-forma-en-l-de-aluminiox3x200-cm0-15 | |
Caterpillar | HDPE 250x550 10mm piece2 | 2 | 13,75 | 27,5 | |
BLDC 6384 high power motor 150KV | 2 | 92,1 | 184,2 | ||
22mm bearings | 16 | 1,02 | 16,32 | https://www.amazon.es/6900-2RS-Bearings-shielded-Bearing-Skateboarding/dp/B092QNH5VQ/ | |
Bride bearings | 4 | 2,76 | 11,04 | https://www.amazon.es/gp/product/B08LD4PTR1/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&th=1 | |
Threaded rod 8mm 1,5m | 1 | 15,79 | 15,79 | https://www.amazon.es/Paquete-metal-roscado-STUD-ROD/dp/B07DK9Q5GW/ | |
8 mm steel bride | 12 | 3,42 | 41,04 | https://www.amazon.es/gp/product/B0833PM19X/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&th=1 | |
Polyurethane resin 800gr | 1 | 20,85 | 20,85 | ||
Rubber floor | 1 | 16,15 | 16,15 | ||
37 tooth slave pulley | 2 | 12,5 | 25 | ||
13 tooth motor pulley | 2 | 7,5 | 15 | ||
330 mm transmission belt | 2 | 10 | 20 | ||
PLA 1.75mm | |||||
Power and control unit | Battery 36V 15 Ah 30BMS | 1 | 228 | 228 | |
Trampa Vesc 6 MK VI BLDC controller 100A | 2 | 225 | 450 | ||
ATTiny45 board | Attiny 45 MCU | 1 | 1,28 | 1,28 | https://www.digikey.es/es/products/detail/rochester-electronics-llc/ATTINY45V-10SH/13466118 |
Capacitor 1uF | 1 | 0,1 | 0,1 | https://www.digikey.es/es/products/detail/nextgen-components/1206B102K102DC/15776050 | |
LedFAb1206 | 1 | 0,15 | 0,15 | https://www.digikey.es/es/products/detail/nextgen-components/1206BBD8100S01/14318403 | |
Resistor 1k | 2 | 0,1 | 0,2 | https://www.digikey.es/es/products/detail/bourns-inc/CR01005-FW-1001GLF/12162314 | |
Resistor 49ohm | 1 | 0,1 | 0,1 | https://www.digikey.es/es/products/detail/bourns-inc/CR01005-FW-1001GLF/12162314?s=N4IgjCBcoMxaBjKAzAhgGwM4FMA0IB7KAbRADYBOMkfMMGCAXXwAcAXKEAZTYCcBLAHYBzEAF9aFABwV4IJJDRY8hEiAAMIRhJAAmdVICschUpz4ikUmAAEAawDyACwC2mLaw6QQAVUH82B2QAWWxUTABXXmxxfABaY2h5FAxzVSs9LR04gBYTFOULNUN6AHYsnV01aMx%2BTDYCXhswOxtMFwATLKA | |
Reistor 1Mohm | 1 | 0,1 | 0,1 | https://www.digikey.es/es/products/detail/bourns-inc/CR01005-FW-1001GLF/12162314?s=N4IgjCBcoMxaBjKAzAhgGwM4FMA0IB7KAbRADYBOMkfMMGCAXXwAcAXKEAZTYCcBLAHYBzEAF9aFABwV4IJJDRY8hEiAAMIRhJAAmdVICschUpz4ikUmAAEAawDyACwC2mLaw6QQAVUH82B2QAWWxUTABXXmxxfABaY2h5FAxzVSs9LR04gBYTFOULNUN6AHYsnV01aMx%2BTDYCXhswOxtMFwATLKA | |
Switch tactile 6mm | 1 | 0,3 | 0,3 | https://www.digikey.es/es/products/detail/cit-relay-and-switch/CS1110J3-1/12503167 | |
3x2 Pinhead SMD | 1 | 1 | 1 | ||
FTDI SMD header | 1 | 1 | 1 | ||
ATTiny1614 board | Attiny 1614 MCU | 1 | 0,94 | 0,94 | https://www.digikey.es/es/products/detail/microchip-technology/ATTINY1614-SSFR/7354615 |
Capacitor 1uF | 1 | 0,1 | 0,1 | https://www.digikey.es/es/products/detail/nextgen-components/1206B102K102DC/15776050 | |
Resistor 1k | 2 | 0,1 | 0,2 | https://www.digikey.es/es/products/detail/bourns-inc/CR01005-FW-1001GLF/12162314 | |
Resistor 499ohm | 1 | 0,1 | 0,1 | https://www.digikey.es/es/products/detail/bourns-inc/CR01005-FW-1001GLF/12162314?s=N4IgjCBcoMxaBjKAzAhgGwM4FMA0IB7KAbRADYBOMkfMMGCAXXwAcAXKEAZTYCcBLAHYBzEAF9aFABwV4IJJDRY8hEiAAMIRhJAAmdVICschUpz4ikUmAAEAawDyACwC2mLaw6QQAVUH82B2QAWWxUTABXXmxxfABaY2h5FAxzVSs9LR04gBYTFOULNUN6AHYsnV01aMx%2BTDYCXhswOxtMFwATLKA | |
Resistor 49ohm | 1 | 0,1 | 0,1 | https://www.digikey.es/es/products/detail/bourns-inc/CR01005-FW-1001GLF/12162314?s=N4IgjCBcoMxaBjKAzAhgGwM4FMA0IB7KAbRADYBOMkfMMGCAXXwAcAXKEAZTYCcBLAHYBzEAF9aFABwV4IJJDRY8hEiAAMIRhJAAmdVICschUpz4ikUmAAEAawDyACwC2mLaw6QQAVUH82B2QAWWxUTABXXmxxfABaY2h5FAxzVSs9LR04gBYTFOULNUN6AHYsnV01aMx%2BTDYCXhswOxtMFwATLKA | |
LedFAb1206 | 1 | 0,15 | 0,15 | https://www.digikey.es/es/products/detail/nextgen-components/1206BBD8100S01/14318403 | |
Pinhead 1x6 | 2 | 1 | 2 | ||
Pinhead 1x3 | 1 | 1 | 1 | ||
Pinhead FTDI | 1 | 1 | 1 | ||
System integration | Spiral cable | 2 | 14,75 | 29,5 | https://www.amazon.es/gp/product/B000UXF5FW/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1 |
Assorted M4, M5, M6 screws and bolts | 1 | 5 | 5 | ||
Velcro strips | 8 | 2 | 16 | https://www.amazon.es/gp/product/B08PK7ZXBX/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 | |
Backpack | Backpack | 1 | 5,99 | 5,99 | https://www.decathlon.es/es/p/mochila-kipsta-essentiel-17-litros/_/R-p-192613?mc=8497302&c=NEGRO |
Total | 1348,62 |
Licence:
Creative Commons-ShareAlike 4.0 International (CC BY-SA 4.0)
You are fee to:
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material for any purpose, even commercially.
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
Notices:
You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.
Vesc-project:
The software I use for the motor controllers is an opensource software developed orginally by Benjamin Vedder (vesc-project.com).
My plan is to collaborate on that project, and eventually make a software fork specially focused on electric skis. Its main goal now are the electric skateboards, though it is applicable on different electric vehicles and motors.
Links
As I considered my final project quite challenging I tried to dedicate almost any week to make something for it:
Final project developement page
Week 2: Computer Aided Design. First prototype designs.
Week3: Computer-controlled cutting. Logo and cardboard prototype.
Week5: 3D scanning and printing. Controller 3D design and printing.
Week 6: Electronics design. First ATtiny45 board.
Week 7: Computer Controlled Machining. Ski press design and milled.
Week 9: Molding and casting. Track studs molding and casting.
Week 10: Output devices. ATtiny1614 board and OLED display management.
Week 12: Input devices. Potentiometer PPM control.
Week 15: Wildcard week. Composite making. Ski composite making.
