Where I used to work they used a metal shear like you cut a sheet of steel with by stepping on a pedal. They used to put the boards in an oven first maybe 150 degrees I don’t remember but it made them cut better without breaking
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Friday, January 22, 2016 8:57 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: Guillotine cutter
I use a brake I purchased at Harbor Freight for about $30. Just score the copper and snap. Safer than a guillotine and many times safer than a table saw.