Wednesday, February 15, 2012

Double-Sided PCB Isolation Routing

I've been thinking about this for a very long time.  My design requirements:
  • Easy-to-setup
  • Easy to get the PCB 'flat'
  • Accurate and fast
  • Automatic setting of home
  • Jigged to make it super-easy to mill both sides without changing my X & Y zero points
Click to enlarge
I am excited to say I think I got it.  My recent test had trace widths down to 0.012 inches and they were razor sharp. The image to the right (20x) shows four of the 0.012" traces ending in pads for a 25pin D connector.  The board only needed very light sanding and the isolation paths were excellent.

Front-back alignment was very good (some issues during the test may have contributed to a less-than-perfect alignment).

I will document the enhancements I made.  I added an anti-backlash feature - it is both easy and, based on my recent results - razor straight 0.012" traces, quite effective.  I have a table/jig that makes flipping the PCB a zero-time exercise - without having to reset my X & Y home points!.  I made a simple jig to nail homing my X and Y axis

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