Parametric SMARS_LC V2 (quiet 28BYJ-48 stepper motor SMARS variant)

thingiverse

Warning: use this at your own risk. Stepper motors can get hot. Electricity is unforgiving. Please be careful. **NEW*** Parametric OpenSCAD files now hosted on GitHub: https://github.com/lukewebdev/para-smars Please fork, pull-requests welcome. Basic Line Follower/Obstacle Stopping Code. https://github.com/lukewebdev/SMARS_Stepper_Line_Follower Video of line following: https://www.youtube.com/watch?v=4SXtbQB2FkQ Video of drawing using SMARS DLC Drawing Attachment: https://youtu.be/ZqQueUTJkCA Sumo/Bulldozer: https://youtu.be/e3OiXQOx9ag https://www.youtube.com/watch?v=jl2UJ-XNMSg Please "follow me" if you want to be aware of updates to this design or the future designs I am working on along these lines. This is a SMARS robot with adjustable track tension. The track here has each mechanical piece enlarged on Y axis by 2%. It also has a much larger pin hole which requires melting one side of the pin to hold it in. The intention of this is to be able to make the track looser or tighter depending on how many 1.75mm track pins you swap out for thicker pins! Don't go thicker than 1.9mm or it will make the track stiff (1.9mm pins STL file is included). It only takes 10 minutes to print enough various pin sizes to adjust your track (if needed) so for the adjustability this is a great trade off and beats remixing the chassis or wheels or tracks and reprinting those by a wide margin. The key with this build is to ensure you have eliminated as much friction as possible in the wheel so that a looser track does not skip as its first resort to actually spinning the slave wheel. See https://www.youtube.com/watch?v=qbcbW5KyKAs for explanation. Also be sure you let it cool down fully after 'break in' spinning to test it. Do not spin it too much or you will overheat things and deform. To tighten the tension of your track, replace (as many as you need) several 1.75mm track pins with the 1.9mm pins (or other size of pin you can generate from SMARS_track_tensioner_pins.scad.). Any questions, please comment.