Thanks for all of your answers. A few more questions. As I mentioned in my last post. I sent out my test Gerber file to my vendor and I have the film back and I checked a few dimensions. The measurements seem to be slightly on the minus side. I had a Ø.152 and it measured Ø.1517, a line width of .006 measured .0059. Does ACE have an accuracy set up? Most photoplots are outputted to 1/4 mil (0.00025") accuracy; some photo plotting services can output files to 1/16 mil (0.0000625") or higher, but the plots will be more expensive. To be honest this would be more related to the photo plotting service itself, except for the following two Gerber reasons:
1. The Gerber data states the line width is 0.0059 (and not 0.006). You can query any trace to get the width.