Quote Originally Posted by Jonathan View Post
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...
All depends. For a small machine with limited cutting forces (and PCB milling meets that requirement) a moving table made from, say, acrylic could work quite well and might well be a lot lighter than a spindle/gantry arrangement. The main impact on acceleration is leadscrew inertia, so keeping the screws small and short and limiting travel would be advisable. Few 'milled prototype' PCBs are going to be larger than 160 x 100mm I'd guess..