Declared-record variation screen
GD&T orientation extrema
Inputs
Choose the record label only; this workspace does not interpret a drawing feature-control frame.
Lowest reading from one documented datum/fixture and measurement setup; signed readings are allowed.
Highest reading from the same documented datum/fixture and measurement setup.
Tolerance copied from the applicable controlled requirement; it is not inferred from a drawing.
Results
Observed orientation-reading variation
0.04
Observed variation / stated tolerance
80
%Stated tolerance − observed variation
0.01
observed variation = rmax − rmin; ratio = observed variation / stated tolerance
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: ISO 286 fits · Tolerance stack · Position deviation · MMC bonus & virtual condition
Method
Formula, when it applies, and when it does not
Subtract entered high and low readings for a parallelism, perpendicularity, or angularity inspection record and compare the observed variation to a tolerance.
observed variation = rmax − rmin; ratio = observed variation / stated tolerance
When
- Declared control type
- Common datum setup
- Comparable readings
- Observed extrema only
Don’t
- This is extrema subtraction for a user-declared parallelism record. It does not establish datum simulation, validate feature-control-frame syntax, construct a tolerance zone, choose a measurement strategy, compensate instruments, assess repeatability, determine conformance, or certify drawing compliance.
ISO 1101 — geometrical tolerancing