How aPriori determines cycle time adjustment factors

Cycle times for a given GCD and process are adjusted with a compensation factor that is based on the following:

• Tolerance that you specify (or import) for the GCD

• Tolerance range for the process and the GCD (see * CAD Angularity GD&T callout maps to Bend GCD in Bar & Tube only. Entered manually only.

• How aPriori calculates achievable tolerance ranges)

• Compensation factor range specified by plant.gtolWorstAchievableFactor (0.75 in the Starting Point VPEs) and plant.gtolBestAchievableFactor (1.5 in the Starting Point VPEs).

The position of the specified tolerance within the tolerance range determines the position of the compensation factor within the compensation factor range. If the tolerance specified for a GCD is at the midpoint of the tolerance range, then the compensation factor is 1. If the tolerance specified is in the bottom half of the tolerance range, the compensation factor is between plant.gtolWorstAchievableFactor and 1. If the tolerance specified is in the top half of the tolerance range, the compensation factor is between 1 and plant.gtolBestAchievableFactor.

In particular, if the tolerance specified is a certain fraction of the way from the worst achievable tolerance to the midpoint of the tolerance range, the compensation factor is that same fraction of the way from plant.gtolWorstAchievableFactor to 1.

Similarly, if the tolerance specified is a certain fraction of the way from the midpoint of the tolerance range to the best achievable tolerance, the compensation factor is that same fraction of the way from 1 to plant.gtolBestAchievableFactor.

If a tolerance for a GCD has not been specified, the compensation factor is 1.