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Project robot lawnmower

Posted: Thu Feb 01, 2018 7:31 am
by Raess
Now I have had my printer for a few weeks, it's time to test something big.
I'm building a robot lawnmower.
So this thread will be updated during the course of the project.
First concept:
IMG_1598.jpg


Second concept models:
3d.jpg
2a.jpg


This part is now printing in a scaled down version to check the body. For real size 585mm Z the print time is around 132H with 0,25layers. And about 2KG PLA.
2.jpg

IMG_1599.jpg



Some hardware specs for the build:
Jetson TX2 Development Kit
Scanse Sweep
Intel® RealSense™ Camera ZR300
2x DC Planetary Geared Motor 24 Volt med Hall IC 30-33 RPM 8mm
2x Vapex Li-Po Battery 6S 22.2V 4000mAh 25C XT60
SparkFun 9DoF
RoboClaw 2x45A ST
Emlid Reach — RTK GNSS modules

(Mower motors for the blades I have not decided yet.)

Welcomes feedback and ideas.

Re: Project robot lawnmower

Posted: Thu Feb 01, 2018 11:22 am
by Raess
First test print ready. It loooks Good.
BAB77CEE-788B-46E5-A36A-FAB9775FEB69.jpeg

8DA1F0C6-2F10-444E-B129-1C23FB0D4D25.jpeg

8AC3A366-B539-4471-BA9A-D3C3412167FE.jpeg

Re: Project robot lawnmower

Posted: Thu Feb 01, 2018 5:49 pm
by zemlin
I'm not sure about using PLA for something like this. It will be out in direct sun, plus with the heat of the motors and electronics - PLA parts might twist up on you with the heat. Looks like a great project though!

Re: Project robot lawnmower

Posted: Thu Feb 01, 2018 6:15 pm
by Raess
@zemlin yes i Know. I had some PLA at home so I was thinking to print first concept with it. Later on I think I will go with ABS. Or do you have any other suggestions?

Re: Project robot lawnmower

Posted: Fri Feb 02, 2018 1:24 am
by Michael.P@Raise3D
I think ASA might work better for this project over ABS. Still cool as all hell though!

Re: Project robot lawnmower

Posted: Fri Feb 02, 2018 7:49 am
by Raess
Thanks Michael. ASA seems to be a bit expensive and I can only find 1kg roles where I use to shop. :/ But i will keep looking.

Some updates on the body.
1. Added holes for motors to be installed with mounting disc (this way I can change sizes and types without printing the entire body again.)
2. Added reinforcement beams cross body and made place for a steel beam in them.

hello.jpeg



printing a small test body again :)

Re: Project robot lawnmower

Posted: Fri Feb 02, 2018 10:02 pm
by Raess
So the small test parts are done after 9h.
DDA6AE1B-FD3F-46A0-A1C3-4444DEA0CBD7.jpeg

7891ADF4-EF28-448A-B808-7DD32A5BBEF4.jpeg


Overall it looks quite good. The parts seems to fit quite nice. Did not yet remove all support and other stuff before the pictures.

Next week I think I will test a full size half, due it’s hard to actually see details with this small print.

Re: Project robot lawnmower

Posted: Sat Feb 03, 2018 12:50 am
by Timber Haint
Looks good!

Re: Project robot lawnmower

Posted: Sat Feb 10, 2018 11:03 pm
by Raess
So partly printed half of the body in full-size before my printer failure (viewtopic.php?f=2&t=6442)

I am happy with the result of the partly printed part. I will make some small adjustment before trying to print full-size again.

IMG_1749.jpg

Re: Project robot lawnmower

Posted: Sun Feb 11, 2018 12:27 pm
by Raess
So i tried to print some small parts to get started again with the printer after the errors.
So I printed Some motormounts to test how everything fits together. Like a glove! :)

IMG_1754.jpg

IMG_1756.jpg

IMG_1757.jpg

IMG_1759.jpg

IMG_1760.jpg

Re: Project robot lawnmower

Posted: Tue Feb 13, 2018 10:58 am
by Raess
So after printing some parts I realized, first of all, it looked like any lawnmower out there. So I had to go back to the drawing board and start from scratch. I wanted a unique look that looked fresh and futuristic. I also took some experience from the previous one and made improvements.

So here is how it looks now:

1-1.jpeg

1-2.jpeg

1-3.jpeg

2-4.jpeg

halfnaked.jpeg

Re: Project robot lawnmower

Posted: Mon Feb 19, 2018 8:47 am
by Raess
Thanks isabellamg. Ones I have tuned in the PETG filament. Printing of parts will begin. :)

Re: Project robot lawnmower

Posted: Tue Feb 20, 2018 8:32 pm
by Squenz
I sorry to hear you still have problems with the material.

But, what irks me, with the goal your aiming at, why do you try to finaccle out these fine settings. Your robo mower projekt is a large built, so go big, shell out extrusion width at least at 0.5, maybe 0.75 or so, give it 0.333333 layer height and see what happening then. Of course you have to stick it to the plate and it has to stay there for the time, but with more material on the plate, maybe that's the key ? Who knows without trying ...

I'd try it this way .. print out your robo part with the positive settings you came up with. Go at 0.75 EW at 0.33 LH, printing shouldn't be any problem with the those settings and watch a miracle happening .. (hopefully, i'll keep my fingers crossed)

Re: Project robot lawnmower

Posted: Wed Feb 21, 2018 5:45 pm
by zemlin
Squenz wrote:shell out extrusion width at least at 0.5, maybe 0.75 or so, give it 0.333333 layer height and see what happening then

I run PETG all the time with great results.
I use a .6mm nozzle and either .25 or .3mm layer. 60mm/s is no problem. I run the outer perimeter at 50% the main print speed - going to test faster tomorrow as I have a time sensitive project and will need to get some big parts cranked out.

I've used a 1mm nozzle and a .5mm layer before. Have to print slower - but even at 20mm/s laying a bead that big builds a part in a hurry.

Re: Project robot lawnmower

Posted: Thu Feb 22, 2018 6:04 pm
by DS2017
Are you modeling this in Fusion 360?

Re: Project robot lawnmower

Posted: Thu Feb 22, 2018 10:19 pm
by Raess
DS2017. Yes first time using it. Its great. I normally use Inventor or SW. But I think i will stick with Fusion360.

Re: Project robot lawnmower

Posted: Thu Feb 22, 2018 10:21 pm
by Raess
First part is printing. It still sticks to bed when added a brim. Only 27h more to be worried :-)
IMG_1937.jpg

IMG_1938.jpg

Re: Project robot lawnmower

Posted: Thu Feb 22, 2018 10:31 pm
by Timber Haint
Looks good.
Only 27h more to be worried


I know... those long prints always make me nervous.

Re: Project robot lawnmower

Posted: Thu Feb 22, 2018 10:49 pm
by Raess
Puh. And thats only one of many many parts :-)

Did some work on the solar mounting and the nose today. I'm not 100% satisfied, I think the nose maybe need a bit more love. Maybe it looks better when camera and other stuff are in place. hmm.

nose.jpeg
nose2.jpeg

Re: Project robot lawnmower

Posted: Sat Mar 03, 2018 6:59 pm
by Raess
Second part successfully printed.
Test assembly with part 1.
IMG_2086.jpg

IMG_2083.jpg

IMG_2084.jpg
IMG_2087.jpg

IMG_2089.jpg