Thanks to everybody.Droxon and selgin You guys are very very nice...
That encourages me to do more test

Droxon wrote:Try this:
viewtopic.php?f=8&t=25410

or just post the link

Thanks...But ..it still dose not work well..

I follow the method of selgin about using the smart bone to control the time and speed of the action.
That was very successful.10000 times thanks to selgin!
here is the video.