The "Accuracy Funnel"

Graphing the calculated accuracy results across the range of travels for a given system results in a funnel-shaped plot as shown in the example below (Using our earlier equation plotting points every 25 mm over 200 mm of travel).

Notice that the highest accuracy is with no stage travel, and that accuracy decreases with the amount of travel (compare the error values in the vertical scale for the light blue line at 25 mm of travel compared to the dark blue line at 200 mm).

When specifications are graphed this way, actual system accuracy should fall within the "funnel."

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