The flutes are therefore preferably not configured in opposite directions to one another, since, in this case and in {HEAD ~ the case} of drilling into {TAIL ~ solid material}, if the reaming chips are combined with the main chips, the risk of chips backing up would exist on account of the different directions of flow 
of drilling into
The flutes are therefore preferably not configured in opposite directions to one another , since , in this case and in { HEAD ~ the case } of drilling into { TAIL ~ solid material } , if the reaming chips are combined with the main chips , the risk of chips backing up would exist on account of the different directions of flow
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