1.2512 2b thread form tap8/25/2023 ![]() It is important to mention that thread gage fits are called out in two ways. Like the No-Go thread plug, the No-Go thread ring is only verifying that the pitch diameter is within allowable limits.Īgain, the scenario of the part accepting the No-Go but not the Go gage is also possible with thread ring gages just as in the case of the thread plugs. That is measured with a separate gage such as an OD micrometer. The major diameter is not measured with either the Go or No-Go ring. The only difference here is that a Go thread ring is measuring the maximum minor diameter instead of the minimum major diameter. Jim has also worked as a freelance developer, creating the Machinist Journeyman, an iphone and android app, and the Machine Shop Calculator, a Casio based calculator.With the same principles as thread plugs, thread ring gages also work in the same fashion. Jim has over 20 years of shop experience working as a manual machinist, CNC programmer, and setup and machine operations, with 18 years of cutting tool sales from a technical aspect. Jim Rowe is currently a Regional Sales Manager for Arch Global Precision, covering Indiana, Ohio and Kentucky. This produces a quality thread more consistently and achieves the best tool life possible. This thin web will produce a fine, smooth point for the miniature drill to make contact with, thus penetrating straight for a nice quality hole for the miniature tap to follow. A miniature spot drill will have a thinner web than larger spot drills. Now, let’s go all the way back to the spot drill again. In the smaller thread ranges (1/4” threads and smaller) the actual difference in diameters between the correct and incorrect percentages are minimal. If a no-go thread gage is something you’re fighting on a regular basis on 9/16-18 and 5/8-18 threads you can see the problem there too. If you review the thread sizes you have the most trouble with and notice they are ¼”-28, 3/8”-24, ½”-13 and 5/8”-11 threads you can now see why.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |