TEST & MEASUREMENT FEATURE
measurement uncertainty and calibration intervals are specified in the ISO 6789 standard.
DETERMINING PROCESS CAPABILITY IN BOLTED JOINT ASSEMBLY To monitor a bolted joint assembly as part of random-sample testing, finished joints are tested for correct bolt assembly using a handheld torque/angle sensor. The retightening torque is measured
This in-process testing during assembly
is the most effective way to verify the overall assembly process to meet VDE Guideline 2862 for random-sample testing as the minimum requirement for identifying bad bolted joints.
TORQUE WRENCH CALIBRATION Torque wrench calibration monitors click- type and indicating torque wrenches, important instruments for checking the quality of bolted joints in the assembly process. Like all instruments, torque wrenches of both types must be calibrated at regular intervals to ensure that the assembly tool is fit for purpose and may continue to be used. Test procedures to determine
to check whether the interaction between the driver, the bolt or nut and the bolted parts has yielded the desired result. Process capability testing represents the cumulative effect of a series of factors that play a role in the quality of bolted joints. Proof of process capability is the final stage in ensuring reliable bolt assembly. The INSPECTpro has a unique modular
function architecture that allows users to configure the instrument according to their needs. The newly developed INSPECTpro is a portable measurement and analysis instrument for torque, rotation angle and clamping force. Both battery power, using an easy to change rechargeable lithium-ion battery located in the rotary joint of the INSPECTpro, for on-site use and a mains adapter for use in the lab or workshop makes the instrument
Left: The torque is measured when the bolt starts turning. The process analysis is determined by the turn- further-torque and break-away torque Below: A hand crank mechanism is used to apply the torque for testing a handheld torque wrench
suitable for a wide range of uses. The 7.7- inch TFT colour touch display unit can be pivoted on the base unit in increments of 10° from 0° to 100°. The features and functions of this
portable measuring system make it suitable for faster and more effective testing, while at the same time offering extensive analysis and measurement results.
Kistler Instruments Limited
www.kistler.com T: 01256 741550
INSTRUMENTATION | DECEMBER/JANUARY 2018
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