In this case, the SCAD code of the Scout printbot has been converted into OOML code ( iearobotics.com/oomlwiki/doku.php ). At the same time, the ScoutMega printbot derives from the MiniSkyBot ( thingiverse.com/thing:7989 ) by Obijuan ( thingiverse.com/obijuan ). The castor wheel in the rear part is the same as in the MiniSkyBot, but the OOML version ( thingiverse.com/thing:12198 ) by avalero ( thingiverse.com/avalero ) was employed.
Here is a small video (in spanish): http://www.youtube.com/watch?v=821ua42vHks
The main design is the same as the Scout printbot, but an additional front bumper has been included in order to mount on it a gripper. The gripper selected is a modification of the one posted in ( thingiverse.com/thing:2415 ).
The electronics consists on an Arduino Mega board and 3 Futaba S3003 servos (for both wheels and gripper).
In the attached files, all the source code is provided: SCAD files and STL. There is algo a C++ file in which it is the code of the chassis using the OOML.
To assemble everything, you will need at least:
- 11 M3x8mm screws.
- 4 M3x20mm screws.
- 14 M3 nuts.
- 2 O-ring: 50x3 mm.
- 1 O-ring 16x3 mm.
Realize that for the gripper I just used some plastic wire. You can do this as well but if you want to use screws (for a more robust coupling), you will need:
- 6 M3x6mm screws.
- 6 more M3 nuts.
I'm sorry about this issues. That is what happens when an electronic design mechanics :)
Download the zip file.
Print all the STL files (look at the quantity of each part). In my case, the chassis was printed in two parts.
Assemble all the printed parts.
Hack the two servos you are going to use for the wheels.
Mount two hacked Futaba S3003 or equivalent servos to the bracket. Mount another one (not hacked) on the gripper.
Mount an Arudino Mega (to mount a smaller version the mounting holes should be changed in the ScoutMega.cpp file). Maybe you need to add some weight on the rear part... the printbot is a little bit unstable.
Wire and program the Arduno.
- Play and have fun!