About Locking Bodies
Use a body lock to fix bodies relative to a lead body over a specific time period during an animation. The bodies will act as if they are glued together, with no movement between them.
A body lock does not take effect until a defined start time. If you drag or move your mechanism into a different configuration before the body lock takes effect, you may have unexpected results.
|
|
 Body positions at each key frame are specified by a snapshot. A locked body can override the key frame position if it has been defined as Unspecified or Desired in the key frame sequence. If the body lock ends before the key frame sequence, body position is determined by the new snapshot. As a result, bodies may jump to a new position, as if they were defined as Desired. |