Truckbot
Description
I used this script to design the gears: thingiverse.com/thing:3575 (You will need to download the scad to use the attached truck.scad file). I also used this script to generate the battery holders: thingiverse.com/thing:5079
VIDEO:
youtube.com/watch?v=F-qvDO9QZV4
As you can see from the video, the left rear axel isn't spinning freely and needs some sanding/filing.
UPDATE:
I fixed the drag on the left rear axel by replacing "axelholder.stl" with "wheelholder.stl" in conjunction with "axelend2.stl".
youtube.com/watch?v=o3SWtk4X-1Q
UPDATE #2:
I uploaded design files and instructions for the electronics:
thingiverse.com/thing:11055
youtube.com/watch?v=ZA7mihbLalw
UPDATE #3:
Parametric oversized snaptogether 3d-printable wheels:
thingiverse.com/thing:14347
youtube.com/watch?v=9cWYPE-cpFg
NOTE:
This design is based on the tolerances of my cupcake 3D printer. As several folks who printed out the 27 to 1 gearset pointed out, the Thing-O-Matic has much better tolerances, so some of the snap-together parts may need some glue (or openscad tweaking) if your printer is better than mine!
Instructions
PRINTED PARTS:
4 x axel.stl
4 x axelend.stl
2 x axelholder.stl
2 x batteryholder3.stl
2 x batteryholder4.stl
4 x connector1.stl
1 x connector2-mirror.stl
1 x connector2.stl
2 x connector3.stl
2 x connector4.stl
1 x connector5.stl
3 x connector6.stl
2 x connector7.stl
1 x connector8.stl
4 x connector9.stl
1 x connector10.stl
2 x connector11.stl
2 x gear1.stl
2 x gear2.stl
2 x motoraxelsupport.stl
1 x motorholder-mirror.stl
1 x motorholder.stl
4 x wheel.stl
4 x wheelholder.stl
UPDATE:
Replace 2 of the axelend.stl with axelend2.stl and use 2 more wheelholder.stl in place of axelholder.stl. This will significantly reduce friction on the rear (non-geared) wheels.
Assemble the parts as shown in assembly.stl. Connect the batteries in series to achieve the 12 volts required by the motors. Thread wire through the battery holder holes and use pliers to snap the hex nuts into place. The hex nuts will hold the wires in place, but if you add 3mm bolts and additional nuts to the exterior of the battery holder (as suggested by obijuan in his battery holder design) that will simplify the wiring. Wire up the motors in parallel and let it rip.
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Can't the design be... consolidated somewhat? Print more than one part per pattern. I may try my hand at that myself.
A few lines of OpenSCAD with just translate....import_stl (and maybe a few rotates for optimum bed use) would do that in a few minutes. Best left to the owner of the printer who knows his bed size and printer limitations.
The parts could definitely be consolidated into multiple-part plates. I tend not to do that, especially in the design phase, for a number of reasons. First of all, part of the rapid prototyping process means printing parts out several times until you get it right. I also find there's much less cleanup when you print parts individually. It takes longer, but these parts (individually) will print clean on a stock Cupcake with default settings.
Great work.
You might try with this "chain" for the Tank robot, it worked quite well for us and we did not need big torque. http://www.thingiverse.com/thi...
There are some videos where you can check it. Take a look at: http://www.youtube.com/watch?v...
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amp;feature=youtu.be
Printing this in various colors would make it even more awesome. I think you just gave me my next project. Excellent work! :-D
wow!
I could imagine a roomba like vacuum cleaner based on this.
What is your goal? An autonomous room discovary vehicle (aka. vacuum cleaner) sounds fun to me:)
More from mraiser
You should make a Gcode file with all the parts in their amounts, so that you can print all of them (on a ToM) in one print :D
Might make it easier to print ;)
Problem with that is that different machines are calibrated differently. What's great on your machine, might be useless on mine.