so seems 10mil is an unrealistic thing to pursue.
As a hobbist, i have no difficulty to give up on that and use large device and wide trace, I do not expect to work on high frequency circuit, so this should not be a big deal.
ok, the question is: what is a choice(if DIY or economical kits) of mill to do 20mil wide trace?
Again, I am sorry that I gave 10mil at first, I just start to probe this field
and thank you for the patience and time to answer my questions, I really appreciate it