• A new method of Torque auditing of bolted joints/assemblies – Compiled by Kapil K. Sen

  Currently, the tightness of a bolt/nut assembly is usually assessed by a torque based method, the approach is referred to as torque auditing. Torque auditing is usually completed by one of three torque methods discussed earlier

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• Importance & Challenges in Torque Audits – Compiled by Kapil K. Sen

  Torque auditing detects fastener relaxation, which occurs to some extent in all fastened joints. For correctly designed joints, relaxation is small and can be virtually ignored. Relaxation in safety-critical joints, however, must always be corrected. Audit frequency always depends on the product being assembled. Fasteners in safety-critical joints are always audited more often than less critical joints ...

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• Understanding Standard Deviation, Cp & Cpk – compiled by Kapil K. Sen

  STANDARD DEVIATION – Standard deviation is represented by sigma σ (the greek letter sigma) “σ “ is the square root of Variance. What is Cpk? Cpk is defined as Process Capability Index. Adjustment of Cp for the effect of non-centered distribution. Cpk measures how close you are to your target and how consistent ...

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• Torque Tool Calibration frequency – compiled by Kapil K. Sen

  The performance of any tool in terms of repeatability & accuracy mainly depends on the following factors : Tool Design Age of the tool Frequency of use Handling of the tool in the assembly line Periodic maintenance procedure being followed. Disadvantages of fixed calendar (time) based calibration interval Ignores differences between the age of different tools in the tool crib. A tool in ...

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• Methods for Torque audits – compiled by Kapil K. Sen

  Forces Affecting Joint Audits Frictional and tension forces affect joint audits. These forces include underhead friction, thread friction and bolt tension. Fastener Motion To audit Torque it is necessary to move the installed fastener. Traditionally , this has led to one of three methods of auditing : Method 1- First Motion in tightening Direction

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