Acrobats http://netapps.marshall.edu/lego/lessonplans/Acrobat/Acrobat.html January 4, 2012 Make some kind of bending person to do acrobatic moves around the bar.
This computer has LEGO CAD so the project can be built and viewed from
many directions.
Two concepts used in building the acrobat machine are horizontal to
vertical stability and right angle gearing.
Beveled gears mesh at right angles and keep 1 to 1 gear ratio.
Crown gear and 8 tooth gear mesh at right angles but gear the
motion down.