Link to my blender file.https://drive.google.com/open?id=1WApKxEItBW1lrh2O9S3e7V1lGQ0xU3el

The cube snaps back to its original postion halfway through animation. I am using transformation constraint to move the cube up and down according to the rotation of cylinder.

  • $\begingroup$ It's occuring at a rotation of 180 degrees. I would suggest gimbal lock may be the culprit. Could try setting the y nd z of spinning object to zero, by applying or via an empty parent. $\endgroup$
    – batFINGER
    Mar 9 '18 at 14:58

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