ok here is what i did, right or wrong i put a piece of stock on the bed to see where i would put the corner of most of the stock i use, when i was happy i put in a 6mm drill and drilled several holes 10mm deep along the x axis 25mm spacing 6 initialy, then i did the same on the y, then i put some 6mm pins in the holes (old broken twist drills cut down to size 20mm) they were a nice tight fit, i then put my stock against them clamped it down then set my coordinates to x=0.00 and y=0.00 at the corner of my stock just once, to acheive this i put one of the 6mm pins in the collet chuck and carefully jogged to the edge of the stock x then set the x to minus 3 then did the same on the y. i then moved the x and y to the home limit switches and took note of the coordinates for the future.

Im sure there is an easier way but then it has never let me down since so i dont even think about it any more..

as for the Z and tool changes that would depend on what type of tool holding you have adopted.

Rick