as far as ho"how is he going to mount the steppers for the z axis"
he could always get an acme screw and nuts and mount it on either side of the column,and take out the pinion gear in the rack and pinion setup for z travel.make something to attach the head assembly to the acme nuts on the acme screw.....make some sort of mount for the stepper to adapt to on top of the acme screw assembly and viola...youve got cnc z axis movement. i did the exact same thing to my grizzly and it works like a charm. the only problem i had was that i had to make counterbalance to compensate for the weight of the head, but it was easily resolved using a few springs mounted on a vertical peice of 6061 aluminum stock.
there are many routes that he could go, it all depends on how much time and thought he wants to put into it.
oh and FIXITT......it would take you 3 hours to mill a spiral on your tiag??how many lines of code could that thing be?
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