14
Tension Calibration Procedure
If you suspect that your 7000Es is not pulling the
correct tension, you should check the tension
with a Gamma Tension Calibrator which provides
a measurement of the actual pulling tension
being applied by the machine.
With the machine set for the fast pulling speed,
and the tension set at 20 lbs., place one end of a
calibrator equipped with synthetic string into a
string clamp. Place the opposite end into the
string gripper and apply tension. If the measured
tension is inaccurate, remove the 2 small caps
from the L.E.D. display cover plate cover. Rotate screw (“L”) in small increments until the
displayed tension matches the tension indicated on the calibrator. Set the machine tension
to 80 lbs. and apply tension to the calibrator. If the measured tension is innacurate, rotate
screw (“H”) in small increments until the displayed tension matches the tension indicated on
the calibrator. Since adjustment of the “L” screw at 20 lbs can influence the tension at 80 lbs
and visa versa, repeat these steps until the set tension matchs the tension reading of the
calibrator at both 20 and 80 lbs. Replace the 2 caps in the L.E.D. display cover plate.
Please note that there will be a range of tension from the maximum tension at which the
tensioner stops pulling (high end of the range), to the minimum tension at which the tensioner
starts pulling again (low end of the range). This difference between the high and low end of
the range can vary from 2-4 lbs depending on the string used to calibrate the machine and
the speed of the tensioner. For consistency, we recommend that the tension setting of the
machine be calibrated as close as possible to the high end of the range, using the fast pulling
speed and a synthetic string, which is the method used at the factory. Using this method will
be the most consistent and will also insure that the racquet will not be over tensioned.
8 8 . 8
MAINTENANCE and ADJUSTMENTS
Adjusting the String Clamps
The clamps provided with your stringing
machine will need minor adjustments ac-
cording to what string type, construction,
and gauge you are using.
To adjust the gap (clamping pressure) be-
tween the clamp jaws, insert the string
through the racquet as if you were beginning
the main strings. Clamp the strings and pull
tension. If the string slips through the jaws of
the clamp, tighten the clamp by turning the
Adjustment Knob, located on the fixed clamp
jaw opposite of the handle, in the clockwise
direction. If the clamp leaves impressions or damages the string, it may be excessively tight
and should be adjusted by turning the hex screw counter clockwise to open the gap between
the jaws. The clamp jaws should be cleaned periodically to be free from dirt, oil, and any string
coating for them to grip properly.
Note: The string clamps supplied with your Gamma stringing machine can accomodate tight
string patterns such as badminton. Depending on the string pattern, the clamp may spread the
strings slightly which will not compromise the quality of the string job.
High KGs
High LBs
Low LBs
Low KGs
Selection
Switch
LBs
KGs
Adjustment
Knob
