lightweight autonomous bot build - The Combine Forum
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post #1 of 41 (permalink) Old 07-29-2018, 02:33 PM Thread Starter
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lightweight autonomous bot build

I have been building a lightweight field based rover to spray Dockens and possibly Buttercups in my hay fields. I would like to be able and let the bot loose in the field and do its thing spraying weeds day and night.

Hoping to find some time to complete the machine over the winter to hopefully test this spring in the UK.

Currently debating the use of an electric gear motor like a wheelchair motor or a small Honda petrol engine ie 3 to 5hp. Batteries are the future but you can get a Honda or Chinese clone for roughly £100 were as the batteries alone will be close to £500 and still will not provide too much run time.

Rear drive is an old motocross bike wheel.

I also have an old toro Greensmaster lawnmower I might use as a back up plan.


Last edited by gavztheouch; 07-29-2018 at 03:06 PM.
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post #2 of 41 (permalink) Old 07-29-2018, 03:31 PM
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Nice, can't wait for you to have it up and going with pictures. Batteries are the future, but I agree Chinese knock off fuel powered is better suited right now. If you look around china has some bicycle gas conversion engines around 100 cad 50ish pounds. They might work well for you. Will try to get a link when I am near a computer.


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post #3 of 41 (permalink) Old 07-29-2018, 04:33 PM
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Cool! I've also started on same small concept. The thought of being driven over by the 4650 JD isn't very appealing. After all, the vehicle is irrelevant, its the software.



Am using an old hydrostatic ride on mower and turning it into a tricycle style - easy steering - with motor/transmission right at the back since there won't be a person on it for traction. Forward and back is a single actuator with position control.
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post #4 of 41 (permalink) Old 07-29-2018, 04:50 PM Thread Starter
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Nice, hopefully as more builds start to emerge we can share and discover a lot of ideas. Think it will be a good future if we can build and maintain our own bots instead of being at the mercy of John Deere and the like.
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post #5 of 41 (permalink) Old 07-29-2018, 05:04 PM
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Saw this the other day...

Can't seem to post the video, keeps saying unavailable so add www. to the front of youtube.com/watch?v=oxpZ1c7TsPI
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post #6 of 41 (permalink) Old 07-29-2018, 08:14 PM
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Electric is a good drive option, we run small 3 phase motors with 1 phase generator though a VFD. Allows full fwd/rev & speed/torque contol direct from microprossor. No messy hyd and everything is cheap off shelf or from China.
For sprayer a VFD and electric pump gives full pressure control so no flow control valves required.
For steering an electric actuator with built in position sensor.
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post #7 of 41 (permalink) Old 07-30-2018, 03:19 AM Thread Starter
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At risk of doing something just because you can with 3d printing I made this helical gear last night trying to experiment with gears rather than a rubber wheel. I would need to print a large outer gear part to fit on the steering wheel with holes to attach it with zip ties.https://www.thecombineforum.com/foru...145509&thumb=1
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File Type: jpg gearmotor.jpg (232.5 KB, 20 views)
File Type: png image.png (163.2 KB, 210 views)

Last edited by gavztheouch; 07-30-2018 at 03:22 AM.
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post #8 of 41 (permalink) Old 07-30-2018, 12:25 PM
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Nice work on the gear, what did you use to sketch it up? That would have taken me 3 times as long to desgin then the actual print time.

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post #9 of 41 (permalink) Old 07-30-2018, 02:07 PM Thread Starter
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Quote:
Originally Posted by Beerwiser View Post
Nice work on the gear, what did you use to sketch it up? That would have taken me 3 times as long to desgin then the actual print time.
Not as hard as you think, its actually a plugin inside fusion 360 that auto generates gear tooth profiles, really handy. I used this tutorial. Highly recommend Fusion 360 to make your designs, its currently free if you use it for your hobby or a startup that turns over less than $100,000 I think.

Fusion 360 also runs on the cloud, so if for example there was a project to collaborate on, everyone could have access to the project and modify their part of the design in real time.

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Last edited by gavztheouch; 07-30-2018 at 02:15 PM.
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post #10 of 41 (permalink) Old 07-31-2018, 12:10 AM
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Quote:
Originally Posted by gavztheouch View Post
Nice, hopefully as more builds start to emerge we can share and discover a lot of ideas. Think it will be a good future if we can build and maintain our own bots instead of being at the mercy of John Deere and the like.

Someday, somewhere, someone will put a stop to farmers making their own, believe me. The biggest drawback will be liability. Someone makes one that has a glitch and kills someone, it will be game over. I wish I was wrong, but I can see it happening.


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