This instructable does not give steps on any particular ball machine, but rather how to build one in general.
Ball machines are the luxurious side to k'nex; these use thousands of pieces. If you do not have thousands of pieces, but rather have somewhere around 400, this is not for you. Sorry. You could always try, though.
These steps are essentially what I do when making my machines.
Step 1: Preliminary Issues
Second is possibly the most important step, as it will save you countless hours. It will be painful, but, SORT THY PIECES! Yes, take apart ALL your models and get many, many bags (or Boxes). Sort them all!
What you Need to build a Ball Machine:
Thousands of pieces
Bags or Boxes
Lots of Spare Time
And next, the building? Hecks no! You still have much to learn, young Skywalker! do NOT start building your first ball machine yet, or you might make a FATAL ERROR! (Like I did when building Project DESTINY)!!!
You should be done with your painful sorting after a few days, so then, again, onward ho!