KEVOS® MAKEOS · Quality
True Position with Bonus Tolerance
Is this hole or pin within its positional tolerance, including any bonus from its size?
Diametral true-position deviation from measured X and Y deviations, with bonus tolerance at maximum or least material condition, and size limit checks.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Feature | choice | Hole or pin. |
| Material condition modifier | choice | Modifier in the feature control frame. |
| Measured X deviation from true position | mm | Measured X location minus basic (true) X. |
| Measured Y deviation from true position | mm | Measured Y location minus basic (true) Y. |
| Position tolerance (diameter) | mm | Diametral position tolerance stated in the feature control frame. |
| Measured feature size | mm | Measured actual mating size of the feature. |
| Lower size limit | mm | Lower size limit from the drawing. |
| Upper size limit | mm | Upper size limit from the drawing. |
Method and formulas
- Actual position = 2√(dx² + dy²).
- MMC bonus: hole = size − lower limit; pin = upper limit − size. LMC bonus: hole = upper limit − size; pin = size − lower limit. RFS: no bonus.
- Allowed = stated tolerance + bonus; the feature passes if position ≤ allowed and the size is within limits.
- Example: deviations of 0.06 and 0.08 mm give a position of 0.2 mm against 0.32 mm allowed.
Limitations
- Two-dimensional position relative to the datum frame used for measurement; datum shift (mobility) is not included.
- Uses the measured size as the actual mating size; form errors affect real gauging.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Accept or reject holes and pins from CMM or layout results
- Explain bonus tolerance to the shop
- Check a fixture or gauge design
Who it is for
- Quality inspectors
- Toolmakers
- Metrology technicians
What you get
- Actual position (diameter)
- Bonus tolerance
- Total allowed position tolerance
- Size within limits
Interpreting the result
- A functional gauge accepts exactly what MMC position allows; use it for production checking where possible.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 615–627. Topic reference; no source tables or recommended settings are reproduced.
- ASME Y14.5-2018 Dimensioning and Tolerancing
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