Abstract: Non-contact machining of workpieces on a mass production basis is accomplished with dynamic and adaptive feedback control to achieve accurate machining of a first and second feature to a specified combined size. The first feature is machined in the workpiece and measured to obtain a value which represents the size. A proces parameter is adjusted in accordance with the measurement value based on a stored transfer function so that the second feature will be machined with an extrapolated size such that the combined size will be within the acceptability limit. Additionally, the combined measurement values of successive workpieces is analyzed to determine the trend of change of the values with respect to the specified size and the parameter is adjusted to machine the first feature and the combined features more accurately.