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True position coordinate check calculator
This is a two-dimensional coordinate check. It excludes datum simulation, orientation, projected zones, MMC/LMC bonus and composite controls. A coordinate-only pass is not complete GD&T acceptance; use the drawing’s datum framework and inspection procedure.
Formula and inputs
Diametrical position error = 2 × √(ΔX² + ΔY²).
Worked example
An X error of 0.03 mm and Y error of 0.04 mm produce 0.10 mm diametrical error.
Use the result in your setup
Confirm the input dimensions and unit system against your drawing before calculating. Keep full precision during a calculation and round only the final value to suit the measurement or programming requirement. A numerical result does not account for a machine’s complete setup, workholding or control configuration.