A METHOD OF MACHINING A HOLE OF UNKNOWN GEOMETRICAL CENTER BY CENTERING THE MACHINE SPINDLE USING A TAPER BUSH

摘要

The invention relates to a method of machining a hole of unknown geometrical center by centering the machine spindle using a taper bush, the taper bush comprising a plurality of serrated diameters on the taper profile to match with the pre-drilled hole, and a recessed hole at the center of the outer diameter of the bush, the method comprising the steps of placing the bush in the pre drilled hole manually shifting the machine spindle close to the outer diameter of the bush; placing the machine dead center on the recessed hole of the taper bush; pushing the spindle towards the pre-drilled hole; determining whether or not the bush is at the center based on the tendency of the bush to move/tilt on either side of the upon pushing of the spindle; and adjusting the spindle location such that the bush is inside the hole equidistantly from all sides the equidistant location being checked using the serrated diameters provided on the taper profile of the bush.