The file is uploaded to illustrate the problem. On the timeline, between 51 and 99, there is a slow rotation of the four screws. This is supposed to happen. But at the same time, for no reason I can identify, there is a slow rotation of the entire object, or perhaps the point of view. It is not clear to me what is instructing the program to execute this unexpected rotation. Where should I look for this unexpected instruction?
Thank you for your insights. Michael VS 8-11-2018 expts.3dm (1.4 MB)