Ok Setting back to defaults with 3mm clearance. still goes down.

http://youtu.be/dlAoPufx4ck

Second attempt, with clearance set to 20mm Goes up! but plunges too far when set to top of work piece.

https://www.youtube.com/watch?v=Jo4E...AUlD8w&index=2

Third attempt, works great with a 5.3 offset and same settings as above. go to zero and it just kisses the work piece

https://www.youtube.com/watch?v=wg7J...AUlD8w&index=1

i do have safe Z set in mach would that affect it (Back at home now)