Homebrew PCBs

On Monday 04 July 2005 12:28 am, Brian Chapman wrote:
>
> Using CAD/CAM software and CNC driver software, I have done lots of
> cutting with .005" end mills and also with drill bits as small as a
> #97 (.0059" iirc). Some of the file operations have required a couple
> of hours and thousands of individual cuts. For my use, the accuracy of
> this system has been outstanding (once I discovered how to compensate
> for backlash in the software).

Can you give me a rough idea of what sort of considerations are involved in 
the machine to work at that kind of scale?  I don't think I've ever seen a 
mill that small and my drill bits only go to #80.  :-)

I guess spindle runout is a major factor there?