Patent ID: 6200074
Filing Date: 2001-03-13
Classification: B23B,H05K,Y10T

Abstract:
A method for drilling a stack of printed circuit boards, the stack comprising one or more printed circuit boards and having a top surface and a bottom surface, the method comprising the steps of:a. placing an entry material adjacent the top surface of the stack of printed circuit boards wherein the entry material comprises:i) a first hard outer entry skin placed adjacent the top surface of the stack of printed circuit boards;ii) a first entry lubricant/adhesive layer separated from the top surface of the stack of printed circuit boards by the first hard outer entry skin; andiii) a second hard outer entry skin laminated to the first hard outer entry skin by the first entry lubricant/adhesive layer to provide dimensional stability to the entry material;b. placing a backup board adjacent the bottom surface of the stack of printed circuit boards wherein the backup board comprises:i) a first hard outer backup skin placed adjacent the bottom surface of the stack of printed circuit boards;ii) a first backup lubricant/adhesive layer separated from the bottom surface of the stack of printed circuit boards by the first hard outer backup skin; andiii) a backup board core, attached on its one side to the first hard outer backup skin by the first backup lubricant/adhesive layer, for supporting the first backup lubricant/adhesive layer and the first hard outer backup skin; andc. drilling through the entry material, through the stack of printed circuit boards, and into the backup board.