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Prosečna brzina isplakeU unutrašnjosti bušaćeg alata:Q21,22LLLLL2ID( 26)U međuprostoru bušaći alat - kanalbušotine:v =( D OD )vQ= 21,222LLLL2 − d( 27)gde su:v - srednja, brzina isplake (m/s)Q - kapacitet protoka isplake (lit/min)ID - unutrašnji prečnik bušaćeg alata (mm)D d- prečnik dleta ili kanala bušotine (mm)OD - spoljašnji prečnik bušaćeg alata (mm)64

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