Composite Position Tolerance Calculator (PLTZF / FRTZF)

Inputs

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Measured X distance of the feature axis from its true (basic) position.
mm
Measured Y distance from true position.
mm
Pattern-locating tolerance zone framework: the larger upper-segment tolerance that locates the whole pattern to the datums.
mm
Feature-relating tolerance zone framework: the tighter lower-segment tolerance that controls feature-to-feature spacing and orientation.
mm

Results

Default result
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True position(TP)
0.2828mm
Out of tol.

Fails the lower (FRTZF) tier.

Diameter of the tolerance zone the feature needs: TP = 2·√(ΔX²+ΔY²).

Also computed

PLTZF marginPass0.2172mm

Within the upper PLTZF tier.

PLTZF − true position. Positive (✓) passes the upper, pattern-locating tier.

FRTZF marginOut of tol.−0.08284mm

Exceeds the lower FRTZF tier.

FRTZF − true position. Positive (✓) passes the lower, feature-relating tier.

Method notes 3 notes
  • A composite callout stacks two tiers: the upper PLTZF locates the whole pattern to the datums (larger tolerance); the lower FRTZF controls feature-to-feature spacing and orientation (tighter tolerance).
  • The same true position TP = 2·√(ΔX²+ΔY²) is checked against both — the feature must pass BOTH tiers.
  • The lower (FRTZF) segment never controls location to the datums; any datums in the lower frame refine orientation only.

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