Satnogs - All Metal "Box Mountable" Rotator

// Warning - Very Long & Boring text before the Start of the interesting stuff :wink: //

Hi,
I’m a 15 years old French teen (so i think my english is going to be bad;-),
I’m passionate by everything who can fly, drone, planes… Satellites !
And overall I try to be a Maker !

-1 year ago I had the chance to participate to a CubeSat project with my physic professor, we created and programmed a CubeSat that today can take photo, display sensor data send GPS coordinates and all that wireless with a python interface, this project made me really want to learn and to interest me more about space !

-So after hours spent on the internet I found one day the Satnogs project, and the first thing that I thinked was (like every teen say every time he found something cool), “huuu this is soo coool I want one” So i decided to build my own rotator, why do I said “my own” because I didn’t builded the rotator v3, and that for many reason,

  • I always want to do the more things by my self, and I know that this is not english but i want to do “by my brain”, like that I do a lot of bad thing and with this “errors” I learn a lot
  • I heard that for some reason (3D printed part) that the rotator V3 wasn’t very durable, and not very strong (only 30 Nm) I wanted to build something more durable (all metal) and more Strong (with the calculation this is 120 Nm, so with the friction lets say 80Nm)
    -In the same time i learned to use Fusion 360, so it was a good exercise to… yeah learn
    -I had an aluminium box that i always wanted to reuse for another project
  • And oooveraal… as a teen I didn’t had the ~ $220 to build the rotator V3 ( Mine costed me (without the box that i already had) ~ 105 €)

// Well done you succeeded to read my boring speech :wink: //

-Soo Enough spoken now its time for the good stuff, taaa daaam :

DSC_3290.jpg

(If u guys want more photos feel free to ask, but as a new user i can only post one photo and also i don’t know if this is interesting or not)

Like I said before he :
/+/

  • is All metal so durable
  • cost ~ 105 € if you already have a box or 125€ if u need to buy one
  • (“the mecanics”) can be mounted the on every box !
  • Waterproof
  • Don’t need to have a 3D printer

/-/

  • is Super Heavy (more than 2kg)
  • is A bit hard to replicate hundreds of times

-If somebody is interested i can share the CAD file of this “Box mountable” Rotator
-I can also share the “to buy” list
-And if really ur interested in, i could maybe think to create a “Kit” with all what you need and the machined aluminum box

Just fell free to say me what u want !

-But what i really would like to know is your opinion on my work, what you find good, AND very IMPORTANT what you find bad and that i can do better !

Why did I posted this ?
To share my work, to help people who maybe want the same thing that i wanted AND to have your opinion (and also to prove to my father that I speak better english than him lol :wink:

Best Regards
Yoyo

Bonjour,
Je suis intéressé par votre projet de rotor …
Bienvenue et salutation de l’Ain (SWLJN26 station 972).

Hi Yo Yo
I am very interested in your project because I too have build some rotators. Not satnogs rotators as I don’t have access to a 3D printer and I too have doubts about the durability and strength of 3D printed parts.

I built one rotator using 2 very old TV antenna rotators. One for Azimuth, the other for elevation. They are controlled by a Arduino micro and a electronic compass. It’s crude but it works. I also build a light duty one using DC motors controlled by eCompass and Raspberry Pi Zero.

Please send any info you want to share to my email address. vk2byf@gmail.com
I am also a Ham Radio operator
Hope to share some ideas and we can learn from each other.
I have a friend Winfried Paul Grundig, who lives in Grenoble.
Cheers Bob

1 Like

Hi Michel and Bob,
First, thanks a lot for your interest !
This is another photo of the rotator in construction (not completly finished) (2 block bearing are missing to “fix” the top of the axis of the worm gear)

Bob i will send you today some CAD file, 2D datasheet and more information
Michel if you are also interested for the CAD file and the technical information you can give me your email adress or contact me at hadji.yohan@gmail.com
Michel si tu est aussi intéressé tu peut soit me donner ton adresse email ou bien me contacter à cette adresse : hadji.yohan@gmail.com

Regards
Yohan

4 Likes

Hi @Yohan_Hadji,

Welcome to the community and thanks for sharing your project.

I would suggest you open a repository (maybe in gitlab) and upload there the CAD file(s) and any other info someone needs to build this rotator.

With the repo and with a suitable license (we use CERN Open Hardware Licence v1.2 for Libre Space projects), you will be able to share properly your project, keep track of the changes and the progress and let others easily give feedback, open issues and contributing to your project.

If you need any help with either git or the license, don’t hesitate to ask. Also you can find most of us online in SatNOGS chatting rooms.

3 Likes

Hi Yohan
From the two photos you posted, it looks like the drive from the stepper motors to the worm drive shafts is outside the box via a couple of belts.
How are these belts and pulleys protected from the elements, snow and ice in your case. UV radiation in our case? (Australia)

How are you driving the stepper motors?
Where is the tracking information coming from?
How are you providing antenna position feedback to the tracking controller?
Mine use the LSM303DLHC e-Compass 3-Axis Magnetometer and 3-Axis Accelerometer Module.
Cheers Bob

Hi bob,
You are right the belt are outside, but this is only for the “test & devellopement”, like that this for me more simple to move manually the rotor when he is not powered, in the final version the working would be exacly the same but with the timing pulley and the belt inside the box

For this time I drive the stepper motor with a Arduino Stepper motor driver shield, but it would also be possible to control it with the official satnogs controller pcb

You can controll it with the satnogs soft or with Grpredict in direct, like @quartapound done some time ago
For this time i’m thinking to 2 posibilities, the first is to use stepper motor with encoders and the second is to add like you said a 6 or 9 axis sensor to the head of the antenna connection
This project isn’t finished yet and for this reason all your wish or idea are welcomed !

Hey! Nice work! Could you please share the part numbers of worm gear and work wheel?

Thanks! :beers:

1 Like

Hi all,
Thanks to @fredy suggestion and in front of the number of ask for CAD or information (by email or on Satnogs), i’m thinking to open a repository to upload all the files and the information, it could take some time (1 week or more) but it would be more simple in the futur to post update ect…
This for this reason that @vk2byf i didn’t yet emailed yet but stay tuned i will do the best the make it as soon as possible !
@azisi This parts are from special order on aliexpress (about 10$/pcs), all the part number and prices ect will be in a document that i’m actually writing and will be posted on the future github repository !
Thanks one more time for your interest
Yohan

5 Likes

Hey @Yohan_Hadji!! If you need any help with repository and documentation let us know.

:beers: