True Position Visual Analyzer
Calculate true position and instantly see if the feature is within tolerance
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True Position Visualizer Notes
What this tool does:
This tool calculates and visualizes true position deviation based on basic (nominal) dimensions and actual measured values. It helps machinists and inspectors quickly determine whether a feature is within tolerance.
Formula:
Radial Error = √[(ΔX)² + (ΔY)²]
True Position = 2 × Radial Error
Where:
ΔX = Actual X − Basic X
ΔY = Actual Y − Basic Y
Key Concept:
The tolerance zone is a circular area (diameter) centered on the nominal position.
If the actual point is inside the circle → PASS
If the actual point is outside the circle → FAIL
Example:
Basic position = (2.000, 1.500)
Actual position = (2.003, 1.497)
Tolerance = Ø0.010 in
ΔX = +0.003
ΔY = −0.003
Radial Error = 0.0042 in
True Position = 0.0085 in
Result: PASS
When to use this tool:
- Checking hole locations
- Inspecting machined features
- Verifying CMM measurements
- Training operators on GD&T
Important Note:
True position is not measured in X and Y separately. It is a combined geometric deviation based on both directions.
Machining Tip:
Small X and Y errors can combine into a larger true position error. Always check radial deviation, not individual axis values.
Shop Floor Tip:
If close to tolerance limit:
- Check fixturing
- Reduce tool deflection
- Verify datum setup
What you are seeing:
- Blue cross = Nominal position
- Red dot = Actual position
- Dashed circle = Tolerance zone
- Black line = Radial error
Tip:
Drag labels in the visualization if they overlap.
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