Hi Alex,
Combination lock cracking. Been there, Done that.
Check out this web site.
http://neil.fraser.name/hardware/locraker/
Automatic combination lock cracker
The Locraker is a computer-controlled device that can crack a three digit rotary combination lock in about half an hour. Since the device totally encloses the lock, it is only possible to crack locks that aren't attached to something (ie. locks whose combinations have been forgotten). It was originally constructed as a project for a high school computer course.
Regards,
Charles Bannister