A Method for Combined Quality Evaluation of Equispaced Cylindrical Bores on a Pitch Circle

Manufacturing and evaluation of the quality of the manufactured components become complicated when the accuracy requirements are stringent. Consider the most common application where holes are drilled on the flanges of cylindrical shells on a pitch circle. These holes are supposed to be equispaced on the pitch circle. The axes of the bores are supposed to lie on the pitch cylinder and thus the axes have to be parallel to each other and also parallel to the axis of the cylindrical shell as per the design drawing requirement. In general, such holes are clearance holes and as such no measurements are made. But presently there is an application where there is a need for such evaluation which is detailed in this paper.