# Measurement Calculations vs ASME Y14.5

#### bigbartman

##### Registered
Our customer drawings reference ASME Y14.5 for all dimensions. On one specific bore we are measuring with our CMM and using a least squares to calculate the diameter. In the ASME Y14.5 7.2 states :
2.7 LIMITS OF SIZE
Unless otherwise specified, the limits of size of a feature prescribe the extent within which variations of geometric
form, as well as size, are allowed. This control applies solely to individual regular features of size as
defined in para. 1.3.32.1. The actual local size of an individual feature at each cross section shall be within the
specified tolerance of size.

With this statement I think that forces us into different calculation like maximum inscribe cylinder and/or a 2 point max diameter.
Is there an ASME or other standard that controls the calculation methods for features?
If we need to call these specific calculations out on the drawings is there a standard method to convey this information?
Same question for measurement paths for point density/locations or scanning vs individual point capture?

#### John Predmore

Trusted Information Resource
I think what you are asking about is known as GD&T Rule #1. In the absence of other controls, the form of a "feature of size" is constrained at MMC by the tolerance of size. This applies to dimensions which extend between two parallel planar surfaces and also the diameter of cylindrical surfaces, including holes. Do an Internet search for GD&T Rule #1 and watch one of the videos. They can illustrate better in video than I can explain with words.

#### bigbartman

##### Registered
I think what you are asking about is known as GD&T Rule #1.
I agree but I am looking for a set of standards that would specify measurement strategies.

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