Homebrew PCBs

I use an abrasive saw blade on a 7 1/4" circular saw, which was originally a 14" (I think) saw  blade which has been worn down and discarded.  The arbor for both sized saws is the same size.

Of course all precautions apply.  Taking care not to breath the fiberglass dust or let it anywhere you wouldn't want it, like on your skin.  Use a vacuum attachment