Computerized Determination and Analysis of Cost and Production Rates for Machining Operations: Part 2—Milling, Drilling, Reaming, and Tapping

Abstract

In Part 1 of this two-part paper, generalized equations for cost and production were presented for five major types of machining operations: turning, milling, drilling, reaming, and tapping. In addition, detailed cost equations were presented for the turning operation for three types of lathe tools: brazed carbide tools, throwaway tools, and solid high-speed steel tools. The present paper, Part 2, presents the detailed cost and production analysis for the remaining machining operations: milling, drilling, reaming, and tapping. Individual equations are developed within each machining category for the major types of cutters and tools involved in the operation. Examples are presented illustrating the use of these equations on specific problems. In addition, equations are developed for calculating the optimum cutting speeds and tool life corresponding to minimum costs and maximum production rates assuming that the tool life-cutting speed follows the simplified Taylor equation. The optimized equations enable one to interpolate and extrapolate the cost and production determinations. Care must be exercised to check experimentally the interpolated or extrapolated values to verify the results from the calculations.