How can I keep a tube centered in a fitting for brazing when the dimensions of the tubes and fittings have such broad, loose commercial tolerances and the tube tends to “wobble” inside the fitting?

This is part 4 of David Pye's series on hardness testing.

This is the fourth part of series of posts in which I look at Office Actions that were issued for a set of trademark applications for three trademark that were filed by well-known individuals or organizations last year.

This is part 3 of David Pye's blog series on hardness testing.

We continue to review some of the most important materials in heat treatment and metallurgy.

This is the third part of a series of posts on the three trademarks set forth in the title. The subject of this blog is a trademark for the phrase “Tom Terrific,” which was filed by the professional football player Tom Brady.

Our discussion on hardness-testing principles continues. In part 2 we will classify some hardness-testing methods.

This is the second part of series of posts in which I look at Office Actions that were issued for set of trademark applications for three trademark that were filed by well-known individuals or organizations last year. The subject of this post is a trademark for the term “The,” which was filed by The Ohio State University.

We continue to review some of the most important materials in heat treatment and metallurgy.  

What is hardness testing?