Parametric robot rover

[veverak]

Hi, I am just a beginner working on his little project, which is to:

create parametric design for robot rover ... (just rover), because I like a lot to programm the CAD model (actually written in Python which exports SCAD code that renders it)

and yeah, I want to try to 3d print everything (of course the "smallest" version possible to try it) at the start... (just because I don't have anything else ...). Final version should be made also from parts made on water/laser cutter

so here is what I have done so far (alias configuration I am working on):

https://cloud.veverak.org/public.php?service=files&t=0c2b278b72a65839d7d9cde7614f9a62

and to show and explain what I ment about "parameters"... here is when I try to scale some parametrs a bit :)

 

https://cloud.veverak.org/public.php?service=files&t=85099301d8890ba8ea5bf7adc7e58119

 

and test configuration will propably look like this:

 

 

https://cloud.veverak.org/public.php?service=files&t=d936968c5f9788677acd687a5ae73954

Parts:

suspension is made with "airless tires"

 

I allready tried to print those and first impression is: wow they are awesome!

Tracks:

 

https://cloud.veverak.org/public.php?service=files&t=bff614cad1d682e4970aa99ae4df5457

made some progress on gearbox..

https://cloud.veverak.org/public.php?service=files&t=a67f9858a5f2d85605b227ea7caed00c

so... what do you think of it?

main TODO are: make "gearbox" from motors to geared wheel and finish main body...

[veverak]

noticed that forum pictures

noticed that forum pictures are maybe too small… pasting bigger versions for other configurations too:

small:

https://cloud.veverak.org/public.php?service=files&t=0348df0b5e967603f14420510b1864e3

big:

https://cloud.veverak.org/public.php?service=files&t=15c19fce3910e41fd085e18b1ac1c29a

[dangerousthing]

Nice. What were you planning
Nice. What were you planning on printing the treads out of? I’m not too much of a tank person because the tanks I’ve built from large RC tanks (from Walmart, years ago, on sale, 1/6th scale M5 Sherman Tank)? That one has hard plastic treads and made a huge racket on linoleum.

I’m looking forward to printing your rover once my printer gets fixed again.

Welcome to LMR, ververak.

[veverak]

well, ABS at first for

well, ABS at first for sure…  but there is filaflex … oh, and now I realize that I didn’t posted detail of tracks!

anyway best would be to print some kind of “form” and made one-piece tracks with “casting” (not sure if it’s the proper word) ?

on the other hand If there would be possibillity to buy something to use as one-piece track, I could made script to create robot for that specific length of track

well, it still will take some time before it will be in a phase where there is some point to print it

[veverak]

overview but many things are

overview but many things are in TODO…

I found out that suspension mounting was not really as awesome as I wanted it to be… so redesigning it slowly

finally gote some idea about how main chassis could look (that tubes -> carbon or any 6mm tube, got many M3 mounting holes) aaaand gearbox in progress

[silux]

Injection molding

For the beginning it may be easier to just print all. It’s possible to 3dprint a mold and inject some material with a lower fusion point

[veverak]

TODO

yeah, 3d printing most of the stuff at the beginning anyway…

injection molding (that’s the right word!) is definetly thing I want to try at least for the tracks, because it makes sense in this context… but question is if I will be able to make something on level of metal mold…

aaaand I don’t have to say that I would have to check if the part is … injection molding friendly

[ggallant]

Link

I am just starting with 3d printing and comming from a programming background am leaning towards using openSCAD. Links to your project seem to be broken.

 

[veverak]

Sorry, ma failure in

Sorry, ma failure in settings of the cloud SW, now it should work (repaired all links in main post)

[ggallant]

cloud

Can read the png files.

I spent about 12 hours yesterday playing with openSCAD. Made a 3D model of a self-balancing robot that I am currently building. It is nice to be able to numerically build the parts. Added detail where the parts will be printed and rough shells for purchased parts such as motors.

You indicated that you are working with python. I assume there is a some sort of visualation involved. Can you add mod detail to the process?

[veverak]

I have written python

I have written python library that works simillary like an openscad (for example added some basic primitives like Tube,Cone…) I create the model with python code and than exports that model into openscad code.

 

EDIT: aaaaand that library is no github https://github.com/SquirrelCZE/pycad but not yet really usable to other people than me I suppose (still possible to make many changes that would force somebody to rewrite projects)