Documents Similar To Fundamentals of GD&T_Alex Krulikowski. GdT _Theory_1st Ultimate GD&T Pocket Guide_ Bas – Alex Krulikowski. Uploaded by. (or occasionally sooner if I have some urgent important news to share.) Alex Krulikowski. Author of 22 books on GD&T, teacher, mentor, instructional designer, . When attempting to implement GD&T, one is constantly barraged This article answers 7 commonly asked questions about GD&T. Alex Krulikowski on Do You Know which Y Defaults Apply to Your Drawings?.

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Seven SIlly Things (about GD&T)

Rick was kind enough to let me publish this article on his behalf. I think you will find it interesting. Rather than respond to these objections by entering into a debate or an argumentit is more productive to “set the record straight” with a clear statement of the facts backed up as required with a detailed explanation of the concept or requirement in question.

True, but so what?

alex krulikowski | Effective Training GD&T Blog

ALL dimensions are perfect absolute. The important krulikowskki is that when we use basic dimensions the part is not required to be perfect. They establish a target value.

Tolerances Geometric or otherwise specify how close to the target an actual part or feature must come. One must look elsewhere to determine the tolerance on the characteristic for which the BASIC dimension determines the target. This is a corollary to gd&&t Thing” 1 and is rooted in the belief that making things perfect is expensive. The fact is that making things perfect is impossible and therefore FREE what’s it cost to do gx&t impossible?


These goals are as applicable to one-of-a-kind items as they are to large runs.

Fundamentals of Geometric Dimensioning and Tolerancing – Alex Krulikowski – Google Books

This is the “Those Other Dummies” argument. While krjlikowski is true that not all people understand tolerancing or, for that matter, any number of other technical subjects as well as “we” might wish, it is also true that many people in many functions in many organizations understand it quite well.

In those cases where ignorance actually exists, the answer is education, not capitulation. If you assume that your audience is illiterate, why are you sending them written messages? This kind of argument is fairly common and is advanced against almost any change.

Its’ basis is the belief that the existing method has been shown to work and we should therefore cling to it. This argument addresses the wrong issue. The question isn’t “Does the existing method work?

Alex Krulikowski

The person who makes this statement is really saying “I don’t understand this stuff and I am unwilling to make the necessary effort to learn it!

Any skill requires some effort to acquire.

The purpose of the MMC modifier is to make the amount of a geometric tolerance dependent on actual feature size in such a manner as to provide a MMC virtual boundary inner for hole, outer for shaft which krulikowxki change as feature size changes.

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This modifier is used for clearance fit applications. This modifier is primarily used in applications where wall thickness control is the matter of primary concern.

The purpose of the RFS modifier is to make geometric tolerance independent of actual feature size. This modifier is used for centering applications. Each modifier should be used in its appropriate applications; none is inherently “superior” to the others. This is a mis-statement of Rule 1 of the Y The actual part features with which they are associated will vary within whatever tolerances control them.

Required orientation depends on function and, therefore, varies from part to part and from feature to feature within a part. Sure this stuff is all well and good, but those! We got to the MOON with plus or minus! Rule 1 is NOT a requirement for a perfect part or feature.

It is, rather, a description of a tolerance boundary from which variation is permitted in only one direction. A datum feature must be toleranced at least krulikowskki tightly as anything which is dimensioned from it.

Charles Roscoe says January 29, Good article.