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2.6 Ball holder
2.6.1 Inserting and loading the ball holder
Caution: risk of injury!
Feed balls into the spindle ball holder only when the motor is switched off.
Keep hands and fingers away from the rotating spindle.
Switch off the VKA motor. Make sure that the spindle does not rotate.
Press the new test ball tightly into the ball holder and/or hit the ball holder lightly with a
copper hammer (e.g. 500gr copper hammer) to fix it.
Press the ball holder with one test ball tightly into the spindle. Hit it lightly with a copper
hammer to ensure that it sits tight.
Feeding test balls into the ball holder:
To avoid damaging the test balls, fix them on a copper plate to feed them into the ball
holder (copper plate dimensions e.g. 10cmx10cmx2cm).
Warning:
When you insert the ball holder ensure that it is maximally 0.75mm and at least
0.50mm above the spindle.
Remove any foreign bodies from the clamping surface of the ball holder before
inserting it into the spindle as otherwise the ball will run out (maximally 0.03mm)
and the results will be inaccurate.
Replace unusable holders immediately with new ball holders.
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