Gammill Vision User Manual page 46

The actual numbers aren't critical – in fact they may vary from
one day to another based on room temperature and how long
the machine has set idle. What is critical is that the results are
below certain values – as shown by the red line on the graph.
The four pins on the graph show the test results for the four speeds. The machine will
automatically re-calibrate itself to the proper stitch length. Press Exit when done.
Note: Any time a result is plotted that is above the red line on the graph, it means the machine
is "tight" and may need oil or other maintenance.
Your
Run the calibration program yourself.
Turn
* Press the Calibration icon to get the message screen.
* Remove the bobbin
* Un-thread the needle and remove it from the take-up lever.
(wrap the thread around one of the foam handles to prevent it from getting snarled up).
* Press the Continue icon – the stitcher will begin the test.
* Verify that the four results are below the red line on the graph.
* Press Exit to return to the System Preferences screen.
* Press Exit again to return to the Main Screen.
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