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:

Elyly snow scooter

Envo Snobike conversion kit

Skizee

As DIY projects, the more similar I found are some electric snowboard projects:

Eltrack Mover, by Illia Muchkin

Youtube link

Home made electric snowboard, by Homemade Mehanol

Youtube link

Shilskii, by Tima Shamalo

Youtube link

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

https://www.amazon.es/GEEETECH-Filamento-1-75mm-impresi%C3%B3n-Spool/dp/B071DM81ZK/ref=asc_df_B071DM81ZK/

 

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

www.skibaumarkt.de

 

Steel edge

4

3,36

13,44

www.skibaumarkt.de

 

Fiberglass 32 cm

4

2,94

11,76

www.skibaumarkt.de

 

Ash wood core 198x15

2

22,69

45,38

www.skibaumarkt.de

 

Epoxy resin

1

21

21

www.skibaumarkt.de

 

Inserts M6

24

0,59

14,16

www.skibaumarkt.de

 

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

https://resopal.com/

 

BLDC 6384 high power motor 150KV

2

92,1

184,2

https://es.aliexpress.com/item/1005003149501401.html

 

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

https://www.amazon.es/dp/B07F6S3ZXT?pd_rd_i=B07F6S3ZXT&pf_rd_p=fbf47ff3-081c-4842-be54-46d1ab576b91&pf_rd_r=GS0NC1NM3G8G4REJMCGT&pd_rd_wg=PLdnY&pd_rd_w=N8l7N&pd_rd_r=97543453-419b-44de-ada0-e0a000da869e

 

Rubber floor

1

16,15

16,15

https://resopal.com/

 

37 tooth slave pulley

2

12,5

25

https://trampaboards.com/

 

13 tooth motor pulley

2

7,5

15

https://trampaboards.com/

 

330 mm transmission belt

2

10

20

https://trampaboards.com/

 

PLA 1.75mm

    

Power and control unit

Battery 36V 15 Ah 30BMS

1

228

228

https://es.aliexpress.com/item/1005003090182798.html

 

Trampa Vesc 6 MK VI BLDC controller 100A

2

225

450

https://trampaboards.com/

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

https://www.digikey.es

 

FTDI SMD header

1

1

1

https://www.digikey.es

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

https://www.digikey.es

 

Pinhead 1x3

1

1

1

https://www.digikey.es

 

Pinhead FTDI

1

1

1

https://www.digikey.es

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 

 

 

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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.