Let's Make Robots!

Z-39 was "Yet Another Tracked Bot" - Build blog

 


Hi LMR,

Now that the Phoenix CNC works good enough to do some real work, I have finally started working on a new project: 

YATB - Yet Another Traked Bot - at least until I find a better name for it

I will try to document it's building saga here, before creating a robot page for it. 

So without further intro:

Phase one: Tracks

First I have done some Blender designing, I came to design something roghly as below:

Tracks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yup classic tank design to start with, one motorized wheel, one idler, 4 idlers on spring suspensions. 

Next I had to flatten the parts and arrange them in a way I can export them to DXF for further processing:

 

 

 

 

 

 

 

 

 

 

 

Then I have imported the DXF into Caduntu (free QCad clone) because the DXF export of Blender seems to be kind of broken and it cannot be safely opened in other software, fixed the alignment then saved again. 

After that I had to do a lot of trickery to get the file in Heekscad to create the toolpathes for milling. I must say that while Heekscad and the Heekscnc plugin are great work, man it is so damn unstable :( Things that used to work fine now crash ... I guess the guys are pushing development too fast ... Anyway I managed to create the toolpath after a lot of waisted time.

No picture, I was to busy crashing all the time sorry.

Finally I did a test cut: 

 

From Phoenix

And the above came out :)

There is more coming, I've been cutting 4-5 hours Saturday and another round yesterday, al lot of small pieces to do still. 

Will update, stay tuned.

Phase 2: Gearbox

Built the first gearbox, it works yeah!

Not perfect by any means but definetly usable.

 

 

From Phoenix

 

From Phoenix

And video of it turning on 3V below.

 

Phase 3: I got a half of ... tank like something

Final gearbox assembly

From Phoenix

Front closeup:

 

From Phoenix

And the mandatory video below :)

 


 

Videos below:

 

 

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Ro-Bot-X's picture

OMG! 

You have created art my friend! Astonishing!

TinHead's picture

:D

TinHead's picture

Frits! The blogs really need to repond to updates ... without bumps...

Have you thought of getting liquid superglue and painting / soaking the gears to harden the teeth.  It's hard to tell by the photos but it looks like thin wood as opposed to plywood.  Single thickness wood will ALWAYS be weak along the grain and we use this trick in aeromodelling to toughen the wood without adding a great deal of weight.

 

Pete

TinHead's picture

.. not plain wood so it's pretty tough. But just like you sugested I also came up with the ideea of applying something to smooth/harden the surface, I found wive's clear nail laquer pretty good and applyed some :) 

Yeah plywood would be cool but unfortunately it is not easily available in in less than 4 mm thickness around here, there is not much request for it so they simply don't supply it.

TinHead's picture

Like bump... 

OddBot's picture

If you do the entire robot out of wood then it will have a cool retro look!

GroG's picture

Did you try the Sketchup plugin yet?

TinHead's picture

... it is a nice plugin but I'm not very fond of the way SketchUp works alltoghether.

I think I'll stick to the sw chain I'm already used to with all the problems for now :)

TeleFox's picture

Great to see the CNC effort paying off. Seems like this will be a stunning looking robot as well as sturdy =)