Patent ID: 6264405
Filing Date: 2001-07-24
Classification: B23B,Y10T

Abstract:
A method for drilling holes into a mantle of a cylinder of a paper machine while the cylinder is in its site of operation in the paper machine, wherein said cylinder to be drilled includes circumferential grooves and an axis, comprising the steps of:supporting a drill carriage having drill bits on the cylinder being drilled, said step of supporting said drill carriage on said cylinder being drilled comprises the steps of:arranging a first set of wheels on said drill carriage;positioning said first set of wheels on edges of said grooves of the cylinder to be drilled prior to drilling; andfixing said first set of wheels in position on said grooves prior to drilling;locking the drill carriage in a fixed position relative to the cylinder being drilled, andpressing the drill bits into the mantle of the cylinder to be drilled while rotating the drill bits to thereby drill holes in the cylinder mantle.