This post appears to be a repeat of your previous post.
I need your support in order to get some tutorial for making the complete crane animation.
1) . The boom has to Extend to certain height with some degree.
I think I answered this in that previous post. If not, what else do you need to know?
2) When the boom Extends at the same time rope and hook also should travel along with boom.
Add a Spline IK modifier to the cable and then link one of the point helpers to the end beam.
3) After Extended to certain height , the rope and hook has to come down to lift box object.
Refer to the #1. answer. If you need to get the cable's tangent point on a pulley it requires some tricky math in a script controller for the tangent point. When I have some time I will try to post a video.
4) Now the crane has to move that box object to some different position.
Refer to this link for how to temporarily link objects together.
It would help if you posted a Max file of your current model.
lee.minardi
