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Moon Rover

by emmett, published

Moon Rover by emmett Jan 6, 2012

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Description

This moon rover is pretty simple; the real point is the treads. The idea of turning my Stretchy Bracelet into tank tracks is thanks to BenRockhold. Turns out it works really well: if you push this around on a slightly grippy surface like carpet, the tracks roll easily.

In fact, the track keys into the wheels so well, this could probably be used as a timing belt or chain.

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I'm thinking of trying to make this work in a RepRap build after I get one, at least, up and running....

Weird, slic3r 0.9.9 is not giving me hole for PEGs. Did anyone else have this. I have no support material or anything, basically, it closes the top and bottom and fille the wheel with infill, completely!

Anyone knows whats happening?

Disclaimer: this is my 1st week with my printer. Using Repetier-Host and Slic3r 0.9.9

I had thought of using O rings for treads.

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Instructions

Print the parts list (use multiply on the wheels and wheelpegs). For the tracks, turn off fill entirely so it just prints the perimeter. The rover body wants to warp (the slices are strain reliefs, but they only help so much). Mine worked fine even though the body was warped, but this might be a good application for PLA. On the other hand, I'm not sure how well the tracks will function without the pliability of ABS.

The OpenSCAD file is parameterized so you can play around with different track dimensions. Ten points to anyone who posts a derivative with a cooler-looking rover body.

Comments

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evamvid on Jun 14, 2013 said:

I'm thinking of trying to make this work in a RepRap build after I get one, at least, up and running....

hkazmi on Jun 11, 2013 said:

Weird, slic3r 0.9.9 is not giving me hole for PEGs. Did anyone else have this. I have no support material or anything, basically, it closes the top and bottom and fille the wheel with infill, completely!

Anyone knows whats happening?

Disclaimer: this is my 1st week with my printer. Using Repetier-Host and Slic3r 0.9.9

ThePelton on Nov 29, 2012 said:

I had thought of using O rings for treads.

RCPaul on Nov 8, 2012 said:

Does anyone know how to Disable the fill in Repetier-Host Mac?

gregted on Apr 16, 2012 said:

Looks great but when I try to open iin openscad 2011-12 the program cashes. Other scad files seem to work so far.

ftc on Feb 26, 2012 said:

Does anyone know how to disable the fill in replicatorg 29? I tried just running the skeinforge.py out of the skein_engines directory but no luck...

emmett on Feb 26, 2012 said:

Go to the Gcode menu -
&
gt; Edit Base Profiles. Click edit on your profile of choice and that will open skeinforge. Click on Fill, then uncheck Activate Fill. I like to a make a separate profile called perimeter for this, so that I'm not having to constantly check and uncheck the fill plugin.

larsie on Jan 29, 2012 said:

This thing is just so cool... I just keep on printing these tracks in different size and shapes, and they are so excellent!

Grog on Jan 18, 2012 said:

Hmm, how to combine the Botmobile Dune Buggy with the tracks.

Anonymous on Jan 11, 2012 said:

Anyway you could possible post a track STL without the fill? My STL processing software does not have an option to print just the perimeter.

Thanks in advance,

Red :)

emmett on Jan 12, 2012 said:

What Skeining software are you using? I'm not sure when I'll get a chance to try that; you might want to try editing my scad file in the meanwhile.

fma on Jan 11, 2012 said:

Very nice design!

How many walls do you use for printing, and what layer size? In other words: what is the total thickness of the track?

emmett on Jan 11, 2012 said:

I use the print-o-matic defaults, so 0.3mm layer height, but it shouldn't matter too much. The main thing is to set up a profile with the fill module unchecked in Skeinforge. That way it'll ignore your number of walls and just print the perimeter, so it'll be just one thread thick.

cfitz10 on Jan 9, 2012 said:

just like a real life moon rover no way! yeah!

clintkc on Jan 9, 2012 said:

Just printed a set of tracks (my focus too) in black ABS, and they both turned out great (first print was perfect, 2nd print had just a couple of errors that cleaned up nice with a new Xacto blade... not a huge deal). I printed both sets with no raft and fill disabled. (My first time trying that. Worked like a charm! I learn something new every day, I swear.)

I also got a 4-set of wheels printed (FINALLY). I created a preset for Skeinforge called "Multiply x4", then tried to print the set of 4 wheels (without a raft) TWICE, with no success. Once I bit my lip
&
amp; added "raft" to the print, they turned out beautiful. However, the wheels are just a bit narrow for the tracks.

I printed the tracks in "black" ABS, and the wheels in "natural" ABS... perhaps this is part of my issue? I may try a re-print of the wheels (again using "natural" ABS, although increasing the Z scale by some random number (like 1.2). I would also like to see a little bit larger "lip" on both en
ds of the wheels, to prevent track run-off during operation. My son wants an R/C version of this design, and I told him I'd try to find time to make him one. I have another house to design/build, but in my spare time (as if I'll have any), I'll do my best to design an R/C version of this design
&
amp; post it on Thingiverse.

EXCELLENT track design, emmett! (Needs some cleats, as mentioned earlier (by someone else), but otherwise a great design element!

clintkc on Jan 9, 2012 said:

I also edited your original body design (rover.stl) just a bit, to remove a lot of material without (hopefully) destroying the looks of the overall design.

I may attempt to make a much "cooler" looking body design, sometime. But right now, I'm very busy designing/bidding homes to build. I may/may not be on Thingiverse for some time.

c60 on Jan 9, 2012 said:

I wondered how long it was going to take someone to adapt the stretchy bracelet to a tank tread. It was the first thing that came to my mind when I printed it.

GOOD WORK!!!

MacGyver on Jan 8, 2012 said:

Why is the track a solid round block?

emmett on Jan 8, 2012 said:

The idea is from joris: http://www.thingiverse.com/thi.... Basically it's easier to model this way and the STL is smaller (fewer polygons), and so quicker to skein, etc. All you need to do is turn off Skeinforge's fill module to print the perimeter only.

elmom on Jan 7, 2012 said:

What about pins.scad? It's not in the MCAD library (maybe it should be ;)

emmett on Jan 7, 2012 said:

Yeah, talk to tbuser: http://www.thingiverse.com/thi.... I use his pin library even more than I use Greg Frost's gear library these days.

smessud on Jan 7, 2012 said:

Just for info.

Have a look at this page (http://www.galileomobility.com... and look at the mechanism that turns a wheel to a track.

If the bracelet was soft enough, the mechanism could be used.

emmett on Jan 7, 2012 said:

That's a cool idea, though the tracks will probably need a lot more arc-length per track-length to make them stretchy enough.

unrepentantgeek on Jan 7, 2012 said:

I'm beginning to wonder if Emmett is actually incapable of making something not totally awesome.

emmett on Jan 7, 2012 said:

Thanks! I think that's the best complement I've ever received.

MakerBlock on Jan 7, 2012 said:

This is really amazing!

UechiMike on Jan 6, 2012 said:

Hmmm...put the knurled surface library on the outside surface...

http://www.thingiverse.com/thi...

That would improve carpet traction....but might reduce hard floor traction.

Gene_Hacker on Jan 7, 2012 said:

Or add spikes to the track. Large paddles(like that shown in the picture) could also be added for enhanced grip on snowy terrain.

Landru on Jan 6, 2012 said:

Glad somebody found a practical use for the spring!

Anonymous on Jan 6, 2012 said:

Do you think belts can be printed strong enough to move X and Y carriages, pliable enough to bend around a wheel made for a stepper shaft, and durable enough to be used in a reprap?

BenRockhold on Jan 6, 2012 said:

They're terrible at transferring force, they stretch a lot and generally don't like being under too much of it; it might work if you embedded some wire, but at that point they really don't add anything.

merlinjim on Jan 6, 2012 said:

We were printing your stretchy bracelets at a middle school STEM (Science Technology Engineering and Mathematics) event and several of the kids asked if they were treads for an RC tank lol!

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