Functional Segments – Model BG: Engineered to replace both GO and NOT GO Thread Plug Gages, Model FD/5 and GH/5 Functional Segments (180 degree contact) are the recommended design for the inspection of Maximum Material – Functional Size. Unlike many alternate Variable Inspection Systems, the Functional Segment is fully capable of detecting variation in Flank Angle, Lead, Uniformity of Helix, 180 degree out-of-round, and insufficient Thread Root clearance. Since any assembly problem is inevitably expensive and potentially embarrassing, the full helical path and profile of the Segments make the Segment design the obvious choice for the undisputed assessment of assembly. Regardless of diameter, a minimum of 50% peripheral contact is always maintained. Available in both standard AGD and special lengths of engagement, all Johnson Gage Segments are easily calibrated in the field with standard Truncated Master Thread Set Plugs. If any wear beyond Class “X” Tolerance is apparent, requalification is always an option at a fraction of the original cost.
Functional Rolls – Model CGFI – Engineered to simulate the GO Thread Plug Gage, Model CGFI Functional Rolls are an alternative to the Functional Segment in some instances for internal threads above 2.00”. While peripheral contact is limited to three distinct and equidistant 120 degree circumferential positions, the non-helical zero-lead Roll does incorporate a full profile annular ridge into its basic design. As the same set of Functional Rolls may be utilized for a variety of threads with identical TPI, the Functional Roll is an economic option for those instances where maintenance of both Variable and Attribute Thread data is desired. Functional Rolls have also been successfully utilized for many threads with helix angles of less than 1’, circumstances where Helical Path Deviation or Elliptical Out-of-Roundness is not an issue, and situations where a Plain Cylindrical Setting surface is preferred.
Pitch Diameter Segments – Model PD/5 – With an axial contact less than one Pitch and .1P Flank Angle contact, Model PD/5 Pitch Diameter Segments are the preferred choice for the inspection of Minimum Material – Pitch Diameter Size. Designed to be used with the GJ5 Series the simultaneous thread ridge and thread groove Cone and Vee contact completely eliminates the effect of Lear Error and Angle Error in the inspection of Pitch Diameter.
Pitch Diameter Rolls – Model CN/PLTI – Designed for use with the GP or GH Series Internal Thread Inspection System. With an axial contact less than one Pitch and .1P Flank Angle contact, Model CN/PLTI Pitch Diameter Rolls are the preferred choice for the inspection of Minimum Material – Pitch Diameter Size. The simultaneous thread ridge and thread groove Cone and Vee contact completely eliminates the effect of Lear Error and Angle Error in the inspection of Pitch Diameter. The pitch line truncation allows for the use of a cylindrical or thread set master.
Major Diameter Rolls – Model CN/MjD – While separate measurement of the major diameter is not a general requirement, Model CN/MjD Rolls are often used to assure adequate Major Diameter clearance as well as tooling verification. A three pitch length of engagement guarantees adequate bearing surface for repeatable and reliable results, while a 5 degree thread flank relief assures clearance to and measurement of the major diameter.
Lead/Angle Segments – Model LA5/GHLA: Whether it’s a specification requirement or simply the desire to expand process knowledge, there are occasions when it is necessary to go beyond System 22 Thread inspection. When that need arises, Model BG/LA Lead/Angle Segments are the ideal selection to provide variables data on the diameter equivalents of the variations of both lead and Flank Angle.