Patent ID: 6361254
Filing Date: 2002-03-26
Classification: B23B,Y10T

Abstract:
A process for drilling holes in the shell of a paper machine cylinder with a multispindle drilling apparatus including at least two drilling modules in which each drilling module includes at least two spindle heads each having a spindle shaft center and a controlling device arranged to control a distance between the spindle shaft centers of a same drilling module and between the spindle shaft centers of adjacent drilling modules, the process comprising:maintaining the cylinder in its operating position in the paper machine; rotating the spindle shaft centers of a same drilling module about an intermediate shaft, thereby adjusting a distance between the spindle shaft centers of the same drilling module; rotating the drilling modules about a central drive shaft; laterally moving at least some of the at least two drilling modules, thereby adjusting a distance between spindle shaft centers of adjacent drilling modules; and drilling the shell of the paper machine cylinder while it is maintained in its operating position in the paper machine.