NSK VR-EB Manual De Operación página 10

CAUTION
When using a bur with a large cutting blade (4 mm or larger in diameter), use it at as low a rotation speed as possible.
Always keep the bur shank clean. Debris in the chuck could cause poor bur concentricity or low chuck retention force.
Always insert the bur all the way into the chuck. If insertion is insufficient, premature failure of the handpiece head bearings,
or accidental release of the bur, may occur.
Always follow the instructions provided by the bur manufacturer.
When a bur is rotating, do not turn the bur lock ring in the OPEN direction. Doing so will cause the Handpiece to break.
Particularly when replacing a bur, do so after rotation has completely stopped.
6. Checking the Handpiece Before Each Use
Before using the product, rotate the bur to perform an inspection. If you notice a problem such as bur instability, vibrations,
generation of heat, or abnormal sounds during an inspection or use of the product, cease operation immediately and contact your
Authorized NSK Dealer.
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