• A new process setup option Rough Milling Cut Efficiency allows users to override the default roughing efficiency assumption for an individual part, affecting the cycle time estimates for rough milling operations. The Rough Milling Cut Efficiency represents the fraction of time the roughing tools are actually cutting metal vs. traversing to other volumes on the part. This option is available on the top-level Machining node in the routing. The default efficiency value assumed is specified by the cost model variable roughingCutEfficiency, which is set to 0.67 in the aPriori baseline cost models. If desired, you may adjust the value of the process setup option if appropriate for your part. Prismatic parts which are easily milled in an efficient tool path would justify a higher efficiency, while complicated parts with a significant number of swept surfaces requiring more part rotation and inefficient cut paths would justify a lower cut efficiency. The cycle time for rough milling operations will be decreased when the efficiency value is increased, and vice versa.