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280 ISCAR DEEP HOLE DRILLINGFINE-BEAM Solution for BTA and DTS Drilling MethodsISCAR FINE-BEAM includes drilling heads with indexable inserts for deep drilling using the Single and Double Tube System.FINE-BEAM for Single Tube SystemDSD-EF%u2026FB and DSD-IF%u2026FB are descriptions of drilling heads belonging to the ISCAR FINE-BEAM family for deep drilling using single tube system. The drilling heads are capable of drilling holes from 25 mm to 89 mm in diameter. The DSD-EF%u2026FB drilling heads are designed with an external 4 start thread connection and the DSD-IF%u2026FB drilling heads are designed with an internal single start thread connection.FINE-BEAM for Double Tube SystemDDD-EF%u2026FB is a description of drilling heads belonging to the ISCAR FINE-BEAMfamily for deep drilling using double tube system. DDD-EF%u2026 FB drilling heads are capable of drilling holes from 25 mm to 65 mm in diameter and are available with an external 4 start thread connection.Design Features of the FINE-BEAM Drilling HeadThe design of FINE-BEAM drilling head depends directly on the diameter of the drill.Drill heads up to a diameter of 65 mm carry 3 inserts (1 peripheral insert, 1 central insert, 1 intermediate insert), picture 6.13.2.1.Picture 6.13.2.1 - Design of FINE-BEAMDrilling Head Up to a Diameter of 65 mmperipheral (1)central (1)intermediate (1)guide pads (2)Drill heads over a diameter of 65 mm carry 5 inserts (1 peripheral insert, 1 central insert, 2 intermediate insert), picture 6.13.2.2.Picture 6.13.2.2 - Design of FINE-BEAMDrilling Head Over a Diameter of 65 mmguide pads (2)center (1)inner (1)inner (2)inner (3)peripheral (1)