No M followed on the latest standard ASME Y14.5-2009 1

[SeasonLee]

For the old standard, Geometric Dimensioning and Tolerancing ASME Y14.5-1994, everybody knows Y14.5 is the standard number and M is to indicate the standard is in metric, but the latest standard ASME Y14.5-2009 without M followed on the standard number Y14.5, does anyone knows the reasons ?

SeasonLee

 

[ModulusCT]

No longer in metric?

 

[fcsuper]

It's redundant maybe?

Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group

 

[ctopher]

My understanding is "M" was a version letter. The new 2009 standard has no version....yet.

Chris
SolidWorks 09, CATIA V5
ctopher's home
SolidWorks Legion

 

[fcsuper]

There are certainly some mistakes in how some of the images were printed, so some corrections are needed.

Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group

 

[axym]

Maybe in this version the M is an implied modifier. Or "regardless of units of measure" applies.

Seriously, it says in Section 1 that metric units were featured in the standard because they are expected to supersede U.S. customary units. But there's nothing about the M (or lack thereof) in the name.

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[MechNorth]

The '94 release included an "M" in the title to reflect that the standard was Metric based, yet it is still fully applicable to the US Customary system. The distinction is made because prior to '94, the standard included examples/illustrations using US Customary Units, and not metric units.
The core of the matter is that Metric is the only LEGAL (as in codified in the US Legal System) measurement system in the USA (US Customary is not codified ... it's just a customary practice). Because ANSI (which gives official recognition of ASME & other voluntary standards) must follow US law, the standards that it sanctions must be compliant as well, and therefore the Y14.5 standard must be metric.
My understanding is that the "M" was dropped in the '09 release because it is now understood that all examples will be in Metric. There were a number of comments / questions about 94's applicability to inch-units, but those were addressed right in the standard itself.

Hope that helps.

Jim Sykes, P.Eng, GDTP-S
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