new joiner Leighton Buzzard

[Jonathan]

moving xy table
z gantry fixed (well apart from going up and down!)

initial aim is pcb milling

For milling PCBs is a moving table neccarily the best idea? You want high acceleration and feedrate. Moving the table will require a greater force than to move the spindle, assuming the table is heavier, which limits your acceleration (F=ma).

You'll need to work it out properly, but it might be something to think about...