Ah, yeah, that's exactly where I am at the moment too. What with lead screws and linear bearing costs it's almost cheaper to buy a sieg x3 mill.
I forgot to add that when figuring your 'gearing' you might want to consider that all thread is atrociously inefficient, figure 20% of the 125oz/in is actually moving the gantry. Very roughly, Acme base is 30-40%, acme precision is 35-55 and ball screw is 70-90% efficient. Putting in something other than allthread will make your motors appear more powerful, 'cos less power is wasted in the nut...
let us know what you decide.. |