T thanks again Clive I hope i dont get to be a pain with this. where you see thhe burn mark on the wood im bringing z to within a paper thickness for my zero i dont quite understand about touch off and the -ve when going down sorry i am disabled on alot of meds which causes me very bad memory so i have to wright alot down, my x is along the length of the material and y is the width, sometimes though it seems as if the z axis travels too far because when it lifts out of the wood it trvels almost to the top of its wall.
Kind regards. Colin