Page 40 of Bore Line Hole Making by Ingersoll Cutting Tools

i single flute brazed gun drills diameter range inch Ø0.100 to Ø1.575 length range inch 5.9 to 118.0 driver advantages · hole tolerance of it7 to it9 attainable · excellent straigtness and concentricity · reduced true position deviation · surface finish ra 0.4 to 1.6 easily achieved · often eleiminates secondary reaming operation the carbide cutting tip available with 4 different standard cutting geometries 8 different standard pad forms and 4 coating options for a multitude of possibilities extension tube the extension tube designed with a crimped v flute and large coolant ports the hardened steel extension tube provides the optimal conditions for twist resistance coolant flow and ship evacuation the driver the steel driver provides the means to clamp the gundrill into the machine tool carbide cuttitng tip 40

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