The ISO 6789 Test Method
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...covers two types of
torque-controlled assembly tools:
Type
I : Indicating torque-controlled assembly tools
Type
II: Tripping torque-controlled assembly tools (click-wrenches)
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The
types are further subdivided into classes according to their
characteristics, permitting a
deviation either of 4% or 6% from the target
torque. The maximum tolerance of the test unit
may be ±1% of the value
displayed.
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The
test procedure requires the tool to be loaded up to 80% of the test value
and the load
then increased slowly and steadily to the appropriate torque
value within one to four seconds.
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According
to the test procedure, the tests must be performed at 20%, 60% and 100% of
the
maximum torque value. The measurement is made sequentially five or ten
times at each
measuring point, according to the particular class.
The SCHATZ automatic calibration system for torque
wrenches has all the necessary technical
features and drive processes for
performing tests to ISO 6789 or to other inspection and test specifications.
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The SCHATZ test bench automatically detects the tripping point with
Type II torque controlled tools (click wrenches).
The final torque, reached with a click wrench, can be different.
Depending on the speed, an operator does not stop immediately when the
signal of the click wrench appears.
Our picture shows three different torque results, which were reached
with the same torque wrench on the same operation. Just the speed was
different.
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