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OpenRC Tractor

by Makitpro, published

OpenRC Tractor by Makitpro Dec 14, 2016
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Summary

As an homage to my father and his first tractor I proudly present my next project, the OpenRC tractor. It's an open source 1/10 scale replica of an original Ebro 160D tractor. I designed it all from scratch and 3D printed all parts. Then, I added some electronics, nuts and bolts and I made it work!
I also prepared some basic instructions and BOM, so you can easily print and assemble your own tractor. It is designed to be easy to print and no supports are needed for any part.

Points to bear in mind:

As part of optional parts, you'll find different optional plates. There is one for Spain and one for Sweden because there are already OpenRC tractors in both countries. If you print your tractor and you would like to have a plate with your country letters, write a comment and I will try to add it.

Recommended motors have poor torque. They work on smooth surfaces but not off-road. I have prepared a mod to upgrade the tractor with a more powerful motor. Check updates.
I used same bearings as OpenRC formula1 to make it easier for those who already have the F1.
And you know what the best thing is? You can design your own tools!

With OpenRC tractor, possibilities are endless, new tools keep coming...so stay tuned!! (see below updates and get more details at (http://www.makitpro.com)
Videos in action
https://www.youtube.com/watch?v=HJo-eUfV0fI
https://www.youtube.com/watch?v=Dlf3Jw0A2M4
https://www.youtube.com/watch?v=Nwje55RMaBw

There is a lot of work put into this project, hope you like it and to see your prints soon!

UPDATE 1:

Get the tractor trailer at: http://www.thingiverse.com/thing:1967778
Get the motor mod to use a standard 540 size motor at: http://www.thingiverse.com/thing:1967812

UPDATE 2:

Get the tractor fertilizer at: http://www.thingiverse.com/thing:1967859

UPDATE 3:

Check updates at http://makitpro.com/index.php/openrc-tractor/

Thanks to ZYYX 3D printer for sponsoring the project. OpenRC tractor project follows OpenRC by Daniel Noree's philosophy and it is licensed under CC-BY-SA 4.0.

Print Settings

Printer:

ZYYX+ 3D printer

Rafts:

No

Supports:

No

Resolution:

0,2-0,3

Infill:

20%


Notes:

Check BOM for details about printing settings and list of materials.

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why don't you design standard servos?

Sorry, I chose micro servos because of the size.
I can try to fit standard servos but It's going to be pretty tight.
Thanks for the suggestion.

I have made a new front chassis for a low-profile regular sized servo and a Traxxas servo saver, but I didn't get around to posting it yet.
I did that because the micro servo was the first thing that was destroyed when my son used the tractor for a while.
With a low-profile servo there is still room enough for a shorty 2S Lipo battery laying on top of the servo.

I would like to print one but the printing time of the rear tires is too long for my environment,
I live in a Parisian apartment and the noise will annoy my family!
An idea ?

About how much did the electronics cost you for this?

Around 100€ including transmitter and all the screws for 3 tractors ;)

Sorry for the delay.
It depends on the electronics you choose but it should be around 40-60$ all included.
Take a look at the FAQ section of OpenRC Tractor main page where you'll find links to different parts and electronics. http://makitpro.com/index.php/openrc-tractor/

How many hours print is this roughly ? 40 h? 60 h? 100 hours print?

Sorry for the delay.
It depends on your printer and printing settings but it should be about 70hours

N20 DC Gear ı use this gear .can ı use this gear without motor esc?ı cannot understand cables when ı try to start ı cannot control n20 gear they always work.https://www.banggood.com/REDCON-SR01-Digital-Analog-Servo-Reverser-With-60-Core-Y-Cable-p-1007464.html?p=1S1716981258201412WT and https://www.banggood.com/Servo-Signal-Reverser-Compatible-for-all-servo-p-939127.html?p=1S1716981258201412WT .another question is these cable how to connect?are they connect each other ?if yes which is the first ?can you help me if it is possible can you send sketch my email:[email protected] thank you so much ı am waiting impatiently your response

Hey citkit!
Sorry that you have problems assembling the tractor.
You need the ESC to control speed of the motor.
First, please be sure you read the FAQ section of the tractor's main page where you can find some answers to your questions and some pictures of my connections. http://makitpro.com/index.php/openrc-tractor/openrc-tractor-faq/
The links you provide, are for the servo reverser and one of them includes a Y cable. For the tractor, you only need ONE reverser and ONE Y cable. Check this post for more instructions: http://makitpro.com/index.php/2016/11/26/openrc-tractor-connections/

Thank you so much ı take your advice.ı have an another question about rear arms how can use 3ch .ı bought 3ch transmittor .can you explain

With 3ch radio, use third channel to connect the rear arms. The rear arms work with two servos. One of them need to be reversed with the reverser. Then the other servo and the reversed, have to be joint with a Y cable. Now you'll only have one cable coming from the rear arms, and that is the one you have to connect to the third channel.
In the FAQ section you'll find pictures and more information: http://makitpro.com/index.php/openrc-tractor/openrc-tractor-faq/#faq3

Where can I find the files for the cab that you have on the tractor? Thanks again!

Here you can find everything about the project including the cab and more tools ;)
www.bit.ly/openRCtractor

How would you print 2_upper chassis without support? Does the curve make the overhang doable?

Yes, I print it with no supports in my ZYYX+ 3d printer at 0.2 layer with no problems. You may have to reorient it so the side tabs are touching the bed. The overhangs are inside the chassis, so even if the result is not perfect, it's ok.

That's what I did. Thanks for the reply

hi can you help me with some parts?can you give links which are steering arm ,rear side arm and rear center arm?ı cannot find on internet exactly what ı need

You can check the FAQ section of the main original page here: http://makitpro.com/index.php/openrc-tractor/.

how much weight can the 3 pt hitch lift?

Unfortunately, not too much. The lifter uses a 3d printed screw made of plastic, so it can't lift too much weight.

Okay, what size servos? Standard 9gram or micro servos, depending on size I may try to scale up to use different hardware.

I use sg90 micro servos but I'm considering switch to metal gear micro servos for longer life. Look in the FAQ section of the project's page for more details and links. http://makitpro.com/index.php/openrc-tractor/

Cool thing, will make this ASAP for my kid (and me).
You have tagged opensource and have the name openrc in the title but I can't find any sourcefiles/CAD. Publishing only stl is not opensource.

You can now download the source file from the original page: http://makitpro.com/index.php/openrc-tractor/
Just folllow the download link and the source file is on the list of parts.
Thanks for the comment!

Would love to see the Massey Ferguson MF35 as option!

That would be awesome...the MF35 is/was very popular in Sweden :)

Hey!! Didn't know that model, I checked and it's awesome!!!,
Unfortunately, there are too many changes to make and I'm currently working on another project. Despite that, I'll consider it when I have more time ;)
Thanks for the comment!

Next weakness...the choice of micro servos without any kind of servo saver.
My usage is probably not what this was designed for...a 4 year old. We have already broken one servo and i'm sure there will be more :P

Are CAD files available for this design...or is reverse engineering, or using the STL's and trying to modify them, the only ways to modify parts?

could you scale the whole build up to use standard servos? and use standard servo savers like traxxas or axial?

For the steering servo you don't need to scale anything up...there is plenty of room inside to put a low-profile servo in there. Actually, it would not take up that much more space than the current micro servo with the piece that you mount it to.

For the other servos...I haven't played with them yet...but there I would just go for high-quality metal geared micro servos and hope it holds up. That might be true for the steering also...it's just that I have more spare parts readily, and easily, available if that were a standard servo.

Thanks again for your comment, I haven't had any problems with them but my usage is gentle and always by adults/teenagers.
I considered to add servo savers but wanted to keep things as simple as possible. In any case, I'll have a look at it and try to find a solution.
Thanks again!!

My use case is probably special...but this model really screams "perfect for kids"...especially when you have a kid that loves all 'bout tractors :)

Anyway, I have started to redesign the parts that are too weak for me and once i'm done and have tested the parts I will publish the files for others to use if they like them.

I really appreciate you taking your time to improve the design, that is always very welcomed!!
I could manage to get some spare time and modified the front chassis part. I haven't had time to print it yet, but it should be more robust.
You can find it here: http://bit.ly/openRCtractor_MMF just search for part 17-front-chassis_V2-reinforced
About the servo saver, I'm currently working on another project. I'm confident on your redesign ;). If that doesn't work, I'll try to find a solution once I finish my current project.
Thanks again for the interest and for your help improving the design!!

Took a closer look at the reinforced front chassis and I don't think it will withstand any more force than the original one. It is reinforced in depth but not it's width. So there is not that much more material there and I think it will break just as easily as the original one.

Good point!
Updated again with a V3 design, now with added width. You can also download the source file from there.
Thanks for the input

Nice! The same day that I finally had some time so I made some changes myself to the STL with Tinkercad :P
v3 looks much better...almost identical to my change :)

And thanks for adding the source file :)

I will publish some mods soon. I just need to assemble the tractor again and make sure they look and work ok.

Good point! I replaced the V2 with a V3 with added width. Hope this design withstands more force. You can find it at the same spot http://bit.ly/openRCtractor_MMF
You can now also download the source file from there.
Thanks for the input!

Found it...thanks for updating it :)

I will see if I will use it...this part was on my list of parts to remake...as I was thinking of putting a low profile servo there instead of a micro servo and use a servo saver from one of my cars.. But I might reconsider and use a metal gear micro servo...although i'm still not convinced that it is strong enough.

Very nice project! I'm printing it for one of my sons and he loves it even though it is not drivable yet :)
(Pictures will come once it is all done.)

I have however found at least one weak point that breaks way to easily, and it is not due to bad printer settings. The two pillars on the front chassis that is supposed to hold the grill snaps of very easily right at the middle of the hole. There should be more material around there. That would make those pillars bullet proof.

Hey nilrog!
Thanks for the kind words, I hope your son likes it even more when it's finished ;)
Even though once assembled you shouldn't have problems, you're making a very good point. I'll try to add more material. It was designed like that to get as much room as possible for battery and receiver.
Thanks again for your comment, looking forward to see your pictures!

And don't forget to visit http://bit.ly/openRCtractor for more info and new tools!!

I'm sure he will :)

The thing is...those pillars breaks very easily when you screw the grill in place. So adding a few more mm's to at least the sides should not cause you to loose any space for battery etc. I don't even have anything in that part of the tractor. The ESC and receiver goes behind the servo and the battery goes above the servo.

Tractor and Trailer parts are printed.... Trailer is mounted, Tractor needs only last adjustments (Receiver and so on ...). And I must say: Congratulation and many Thanks to you for this good looking and well working Modell!!

You done a very good job in design and construction! Thank you for sharing this Project with us!

Best regards and greetings from Munich
Alfred

Thank you very much for taking time to write nice things about the project, it is much appreciated!. Don't forget to upload some pictures of your print, I want to see how it turned out!!
And stay tuned to http://bit.ly/openRCtractor ...a new tool is almost ready to be released!

Best regards!!
Cristobal (makit)

I was looking forward to print this model for a bit now, I could find all the non printed parts easily except the arms, any reference where I could get them online without grabbing a bank? thanks :)

Hey!
Take a look at the FAQ section here http://bit.ly/openRCtractor
Hope that helps!

yeah, I was looking at that but unfortunately most of the links are Under restocking or Out of stock :(
but thanks, I'll keep looking :)

Sorry to hear that, I will have a look. In any case, you can search for similar items from hobbyking.

Hi. I have tractor almost printed. Now I'm trying to print rims. Do you have any recommendation how to setup slicer? Overhang angle on rear rim is too big and I cant print it. I tried cut rim to two halves, but there isn't line, where everything is connected and nothing isn't in the air.
Thanks in advance. Lubos

Thanks for your tips Makitpro and Renngarage. Problem solved. It was a combination of my poor printing experience and technical issue (bad bearings on Y axis). Rims are in procces now. Once again thanks.

Lubos

Glad to hear you have worked it out!

Hey Lubos, sorry to hear that, as Renngarage says, you shouldn't have problems printing the rims. I use 0.3 layer height, 25% infill and about 50mm/s, 4 perimeters and they print fine. Renngarage suggestion is a good point, check your slicer settings just in case your printing perimeters first.

Hi Lubos,

why you can't print the rims? The inside is designed, that it should be printable without support. I printed with 0,2mm Layer and about 60% Infill. I always print slow with ca. 46mm/s. Perhaps there is a setting in slicer, that you print the outside perimeter first? It would hang in the air, so inside to outside would help..

Looks great! Printer is printing, orders are places on banggood/aliexpress. Not sure what battery to order though, any recommendation? Also not quite sure on the ESC. Will this work: https://www.aliexpress.com/item/DIY-Mini-Z-Car-Bidirectional-30A-Miniature-Brushed-ESC-With-Brake/32631111167.html?spm=2114.13010208.99999999.262.YBZGYe ?

That's awesome, another OpenRC tractor comes alive!
You can check the FAQ http://makitpro.com/index.php/openrc-tractor/openrc-tractor-faq/ of the OpenRC tractor page. I have added a section about batteries and there is also one about the ESC.
Haven't tried it but I think that ESC should work fine.
Looking forward to see your print! ;)

Thank you for your reply. I must have missed that FAQ, but that helped and I should now have ordered everything needed save for one thing, "servo screws" - what's that? :)

Of course there will be pictures, but there will be a long wait for the China ordered stuff to arrive first :(

You're very welcome!
Servo screws are just the screws that normally come with the servo (usually 3 screws for each servo).
Hope now everything is ready and eager to see it printed (once the items arrive)!
Don't forget to visit http://bit.ly/openRCtractor frequently so you don't miss new tools and add-ons ;)

Wow!!! What an awesome work!! Thanks for sharing such a great project. I will print it for sure .

Thank you very much for your comments, looking forward to see your print ;)
Visit http://makitpro.com/index.php/openrc-tractor/ for more information and updates!

Just wondering, is the Ebro 160D a copy of the Massey Ferguson 165?

It's a Spanish company that bought the manufacturing rights to that tractor I believe. As far as I know, there are identical apart from the logo on the front!

Yes it is! In fact it's the same. Here in Spain Ebro used Massey Ferguson's technology but sold under "Ebro" brand. At least that's what my father told me ;)

Love this project, it´s brilliant! well done!

Thanks!! Hope to see your print soon ;)

Hi there, Are you able to post a photo or two of how the steering goes together inside (under the body) as i cant figure out how you attach # 11 to the servo and what way up the servo goes. Cheers (hope that makes sence)

Hey!! check http://makitpro.com/index.php/2016/11/26/openrc-tractor-connections/ post, there are some pictures that may help you.
Let me know if you still have doubts.

Awesome love it :). Just started building.

Looks awesome! I will try to make it

Nice project, I have been waiting for something like this.

Thanks! Hope to see your print soon!

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