Calibration
Regular calibration for inch or metric thread gaging is the backbone of any quality assurance system. Under normal circumstances, Johnson Gage recommends a one-year cycle for all Gaging Elements and Setting Masters. Extenuating circumstances such as 100% inspection requirements of large lots, frequent inspection of abrasive material, or any other out of the ordinary use may dictate a more frequent calibration frequency.

In addition to the establishment of a regular calibration cycle, conformance of the calibration process to the written requirements of standards and specification such as ASME B1.2 is an absolute necessity. All too often, calibration of thread gages ignores many of the basic elements and characteristics essential to gage performance. In direct contrast to this limited examination, Johnson Gage is proud to offer the most comprehensive calibration service for thread gages available in industry today. In addition to the standard visual inspection for oxidation and obvious damage, the following dimensions and characteristics are inspected on each and every Thread Setting Plug or Ring calibrated by Johnson Gage.

THREAD ELEMENT
PLUG GAGES, THREADED, SETTING OR WORKING, CLASS "W" OR "X"
RING GAGES, THREADED, SETTING OR WORKING, CLASS "W" OR "X"
Pitch Diameter Size: Front, Center, Back
Yes
Yes
Major Diameter
Yes
Verify Root Clearance
Minor Diameter
Verify Root Clearance
Yes
Flank Angle: Leading and Trailing
Yes
Yes
Lead with Uniformity of Helix
Yes
Yes
Eccentricity of Cylinders: Pitch to Crest
Yes
Yes

 

 

 

 

 

 

While the inspection of Class "X" Working Gages is less stringent than the rigorous calibration of Thread Setting Plugs or Rings, rest assured that Johnson Gage will not only meet the standard requirements for Conformance to Class, but will exceed them on a regular and consistent basis.

Requalification of Gage Segments goes hand-in-hand with calibration. If inspection shows a pair of External or Internal Segments has exceeded Class "X" Gagemaker's Tolerance, Johnson Gage can requalify and repair the Segments to original "as new" condition for a fraction of the original cost. As an additional precaution against premature wear, consider the addition of titanium nitride coating to your External and Internal Gage Segments.

In addition to the calibration of its own products, Johnson Gage has the capability and capacity to handle all your thread gage calibration, regardless of original manufacturer. Contact Johnson Gage directly to further discuss your requirements.

Thread Gage calibration is a critical and exacting process. Without exception, all Johnson Gage thread gage calibration is conducted in strict conformance with company-generated written procedures as well as all applicable sections of the ASME B1 document series and FED-STD H-28. An overall Quality Assurance System registered to ISO 9001:2000 governs the entire process.

 
 
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