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Proper Terminology

Proper Terminology

Proper Terminology

(OP)
I remember when Y14.5 Standard for Dimensioning and Tolerancing first was introduced, the term applied for the tolerance of a hole location defined by basic dimensions was "True Position".  Later, the term was changed and became "Position".  Does anyone know if it has been changed back to "True Position" and/or what the current proper term is?

RE: Proper Terminology

The term "true position" is still used in ASME Y14.5-1994.

RE: Proper Terminology

Everyone using this std should have a copy of it.

Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP3.1 / PDMWorks 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

RE: Proper Terminology

ANSI Y14.5M-1982, ASME Y14.5M-1994 and ISO 1101-1983 all define the symbol of a circle with cross-hairs across it as Position.

in both copies of Y14.5M, True Position is defined as "The theoretically exact location of a feature established by basic dimensions."

"Wildfires are dangerous, hard to control, and economically catastrophic."
"Fixed in the next release" should replace "Product First" as the PTC slogan.

Ben Loosli
CAD/CAM System Analyst
Ingersoll-Rand

RE: Proper Terminology

looslib is correct.

The tolerance zone is located at true (exact) position, and the feature is located within that tolerance zone, thus a hole "is at true position within .xxx dia" would be an acceptable statement.  

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