Graphical approach for selection of minimum-cost-per component conditions when various restrictions apply:

Various machining constraints may govern the final selection of the optimum cutting conditions. The minimum permissible cost is tentatively set at 1 with the maximum available machine feed.

• Point 1 satisfies feed and speed restrictions. With the power restriction introduced, the conditions are moved to point 2 and latler to point 3 to account for the force restriction. The surface finish restriction moves the conditions to point 4 and since the machine does not have the required step for point 4, the next lower feed step 5 is used; now, the available speed steps are checked for lower cost. In practice, the minimum cost cutting conditions can be arrived at fairly quickly, since all the restrictions may not apply at the same time.
• The cutting conditions are found by selecting the highest permissible feed and determining the speed.