Sheet cutting and scoring device and method

A sheet cutting and scoring device comprising an elongate body for positioning on one face of a sheet to be worked, track means extending longitudinally along said body, a carriage on said track means for movement along said body, a lateral extension on said carriage extending laterally beyond said body for movement therealong over the sheet, a tool holder carried by said extension, and a tool depending from said extension for movement therewith in cutting engagement with the sheet, said tool holder comprising an upstanding hollow cylinder fixed to said extension outboard of said body, and said tool comprising a shank depending from said cylinder and vertically slidable toward and away from the sheet to be worked, a cutting element on the lower end of said shank for engagement with the sheet, and resilient compression means in said cylinder urging said shank downwardly for engaging the cutting element with the sheet.