Hi All,
I am very pleased to announce that the long-awaited ASME Y14.45 standard for Measurement Data Reporting has finally been published!
The primary objective of Y14.45 is to provide standardized definitions and formats for reporting GD&T measurement data. This standard is necessary...
The recent thread on Surface Profile and Size brought up an interesting effect regarding tolerance zone extent.
Here is a drawing for a fictitious part, that illustrates the effect. I have intentionally avoided the use of directly toleranced dimensions.
It has been proposed that an...
Hi All,
A new revision of ASME Y14.5.1 Mathematical Definition of Dimensioning and Tolerancing Principles is nearing completion. Y14.5.1 is an important standard in quality assurance and metrology as it defines actual values for geometric characteristics. The new revision supports ASME...
Here is Figure 8-24 from Y14.5-2009, with an additional position tolerance added:
The additional callout refines the relationship of the feature to Datum A.
Is this a valid application? ;^)
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
Hi All,
Here's a question (more of a survey, really):
When a first article inspection report is produced for a part with geometric tolerances (position, surface profile, flatness, perpendicularity, etc.), what information do you feel is necessary?
1. Measured values for each geometric...
Hi All,
Here's a fun one.
If the place that the feature is allowed to be in is called the "tolerance zone", what should we call the place that the feature is not allowed to be in? Functional gage components, for example, would occupy this other place.
I have a couple of possibilities, but I'm...
Hi All,
This one might seem obvious, but I'm not a drafting expert.
I have a part with a square tube, that holes are drilled into. The holes go all the way through the "top" layer of the tube, but not through the "bottom" layer. What is the best way to indicate this on the drawing? Do I use...
Hi All,
The ASME Y14.5.1 standard for Mathematical Definition of Dimensioning and Tolerancing Principles (a.k.a. the "math standard") is in the process of being updated. I was wondering what opinions people had about the existing version (Y14.5.1M-1994). I realize that this document is...
Hi All,
A client has a few sheet metal parts that are each going to be made by two different suppliers. One supplier is in North America and prefers to work with Imperial stock material thicknesses and the other supplier is abroad and prefers metric stock thicknesses.
The suppliers each want...
Hi All,
Here's a question.
Let's say you have a drawing of a simple part that is a rectangular plate with a 4-hole pattern. The feature control frame for the hole pattern has a Position tolerance referenced at MMC. There is a typical ABC datum structure, referencing one face and two sides.
If...
I'm putting together some GD&T marketing materials and I need a catchy slogan. Here are some of the possibilities I've thought of so far:
1. "Y14.5? Why not?"
2. "It's The datums, stupid."
3. "How to find your true geometric counterpart"
4. "Everything you always wanted to know about...
