Pull and release blue frame to let green barel cam linearly reciprocate and turn 180 deg. for each stroke.
Blue spring forces orange pin towards the cam. Key factor is different deepths of the cam grooves.
STEP files of this video:
http://www.mediafire.com/download/qimq88u2pgq9rqs/BarrelCam180o2aSTEP.zip
Inventor files:
http://www.mediafire.com/download/zydn37kiy6p6d36/BarrelCam180oInv.zip
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