[LDCad] Some Gear Rotations are "disconnected"

[N. W. Perry]

Isn't it an illusion caused by rotation grid stepping, similar to car wheels that seem to rotate backwards when sampled at 25 frames per second?

Yes, I can reproduce the behavior by using a 15 deg rotation step (which I believe is the default). Changing it to something else makes the rotation appear normal. Either way, it's just an illusion (but a fun one).