Product Description1. Fixed the drill machine tightlyMake sure the
spindle is stable and check the electrical and mechanical parts of
the drill core bit are good. 2. ConcentricityEnsure the
concentricity between the spindle and core bit, otherwise, the
drill core bit will be rolled from side to side. 3. Cool
waterPrepared enough water when drilling. The better performance
and speed we want, the more water is needed. 4. PressureDo
not press heavily and heat the tube except that you want to see
deformation. Give appropriate pressure when drilling.
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