Hi Roberto,
Looks like your having fun! Great work and great pictures. I noticed the same issue with the bolts, see:
http://www.cnczone.com/forums/showth...324#post271324
Did you re-tap the holes deeper? Some of mine are only about 3/8 in deep. Is it possible to drill them deeper and then re-tap without messing them up worse?
You mentioned that the deflection was +/-.005 in x,y and z. What load did you use for that deflection. Also what directions are x,y and z so we are talking about the same thing. I use x for right to left, Y for front to back and z for down to up. Don't know if this is correct for mach3 since I haven't finished adding CNC yet. I think I recall posts about changing the coordinate system between milling and lathe work.
Pushing the mill head for and aft is by far the least stiff direction. I plan on stiffening up the fifth column by bracing it for and aft and attaching it directly to the lathe bed in some fashion. By the way the quadralift locking lever that pinches one of the rods seems to have no effect on my machine.
I'd like to see any pictures you can take of the lathe bearing replacement as I'm sure mine will need that.
regards
Mike