mm and inches on same board

Community PCB Design
6

Thanks for the feedback folks.

I tried changing units of measure from inches to mm and that seemed to work. Here’s a few other tricks that I found while working:

  1. As I needed to go exactly 20.88 mm from one header to the next on the ConnectOne part, I placed the first header (near the origin) and used the Info of the 2nd to place it exactly 20.88 mm’s away with the same X coordinate.

  2. The routes don’t line up exactly. I put all of the traces on the bottom and that typically forced a via close to/on top of the header pads. Zooming in and clicking on the via usually gave me an option to change that very small trace segment to bottom. If not I moved it around a bit and exposed more of the trace.

I cleaned things up, labeled the layout, and printed to PDF the 1:1 but found the components slightly off. I’m using a header from Sparkfun and another 2mm header from another library. Is this typical?

I’m also interested in reviewing my layout in gerbv if I can figure out how to get it installed on my Mac. In the interim, I looked at the GB* files. Is there a good tutorial on reading these files?