Adder Subtractor

Creation date : September 14, 2009
Adder-Subtractor with double differential gears

Essential mechanism is the same as the one by Philippe Hurbain below ;
(Image source : Philippe Hurbain's Brickshelf page)
My version is different in some aspects such as frames and the motor positions.


Top view and front view. Front view shows some extra space inside to insert the chassis beam.


Left, right, and overall view





A modification for example :
Main drive motor was changed to XL motor for more power.
Gear reduction for M motor is added on top.(12t->20t and then 12t->20t->differential)