![]() ![]() In addition, any other drilling head configuration or coated drilling head can be produced upon request. Larger diameters, between 32 and 40 mm, are available upon request. The drills are available in the range of 2.5 to 32 mm in 0.1 mm increment diameters. ISCAR’s advanced gundrill technology provides superior geometric and dimensional quality for both deep and shallow drilling. The driver ensures the connection between the gundrill and the machine tool. Minimum oil/coolant pressure is 35 of the PSI values on page 2. Reduce RPM or ensure adequate supports are in place or use an intermediate length gun drill. ![]() High SFM will cause vibration and/or harmonics with long gun drills. This cross-section provides the optimal conditions for twist resistance, coolant flow and chip evacuation. Consult Sterling Gun Drills to verify application requirements. It is made of hardened steel that is highly resistant to twisting. The cross-section of the shank is V-shaped with coolant holes. Note that when the head is resharpened, the diameter of the drill changes, affecting the hole tolerance. For high precision drilling, the taper should be reduced to a minimum. The taper angle depends on the type of material to be drilled. The carbide head is tapered on its length to reduce friction. Chips are evacuated along the V-shaped external flute. ![]() ISCAR's gundrill consists of a single piece carbide head, a streamlined shank and a driver through which coolant flows to the working end where it is most needed. ![]()
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