Thank you once again Robin
I want to control x , y & z via CNC. In these few short posts and your machine build log I have gained enough knowledge to go forward. I need to do a lot of measurements / drawings before firming things up. Once I have sorted out what I'm going to do I will post a machine build log with pictures.
I will take on board your comments about Marchant Dice and look else were.
Thank you once again for your help

Kind regards
Ted