Cameron I can't speak for the other members,but .0004 is what they would like,but a 500lb gantry is scary to them.I see posts where the guys are worried about a 100lb gantry and 50lb Z axis.For the wood guys deflection is not a big issue as the spoil board is surfaced to be level with the gantry.At .004 what is the deflection.I don't think anyone here is making opitical accuracy tables.
Thanks for all the input
Larry