Set Up and Maintenance
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4.17.3 Calibration procedures in PowerMACS
4.17.3.1 General
It is strongly recommended to perform a calibration of the spindles after the system has been installed at
the production site. It is also recommended to make a new calibration periodically (for example one time a
year, every 6 months etc.) and this is normally specified in the customer quality control system.
There are at least four alternative ways to perform a calibration:
1. Run on the actual joint.
2. Using a test joint where the test joint should have similar characteristics as the actual one.
3. Using a dummy joint that always is pre-tightened.
4. The manual method.
Method 1: is recommended and is normally giving the most accurate results. One of the other methods
can be used, as it is not always possible to use method 1 due to mechanical or similar reasons.
Method 3: The joint is not a real screw joint. It could be a mechanical part with a welded bolt head or
similar.
Method 4.1: Program a torque x Nm and the speed 0 (zero) rpm.
Apply a torque wrench to the inline transducer on the spindle square drive.
Start the test.
Turn the torque wrench until the spindle shuts off (spindle torque is released).
Register the torque value.
Method 4.2: The same as for method 4.1 except that you don‟t use an inline transducer but only a torque
wrench. This method is NOT acceptable.
The easiest way to perform a calibration is to use the Test Bolts function. To be able to run spindles from
the "Test Bolts" the PLC output “DISABLE_TESTBOLT” must be set False. (In a system running in
production this output is normally True for safety reasons).
When running a spindle from the “Test Bolts” menu most PowerMACS PLC functions are not active.
There are three alternative ways to run a spindle from the Test Bolts menu:
Single run
Program
Mode
These are described in the following chapters.
Note! You should only run one bolt (spindle) at a time when calibrating.
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