Page 253 - Demo

251DEEP HOLE DRILLINGISCAR-GUNDRILLS Brazed Tip GundrillsThe ISCAR-GUNDRILLS line provides solutions for deep drilling by Gundrill method with brazed tip drills. This type of Gundrill consists of a solid carbide tip brazed to a steel shank. This style of Gundrill is available from 2.5 mm to 40 mm in different lengths according to table 6.11.2.1 and can be used on various types of materials.Table 6.11.2.1Drill Diameter (mm) Max. Flute Length (mm)2.50 to 3.09 11003.10 to 5.99 25006.00 to 11.39 300011.40 to 40.00 3500STGD-%u2026. Standard Brazed Tip DrillsSTGD-%u2026 is a description of standard gundrills with a brazed tip belonging to the ISCAR-GUNDRILLS line. STGD-%u2026gundrills are capable of drilling holes from 2.5 mm to 20 mm in sequential steps of 0.1 mm and holes from 20 mm to 40 mm in sequential steps of 1 mm. The sharpening of these gundrills depends on the diameter of the drill (table 6.11.2.2), and the profile is the same for all these gundrills (%u201cGeneral Sketch%u201d according to table 6.11.2.3). The driver type can be selected according to table 6.11.2.4.GD-%u2026. Semi-Standard Brazed Tip DrillsGD-%u2026 is a description of semi-standard gundrills with a brazed tip belonging to the ISCAR-GUNDRILLS line. GD-%u2026 gundrills are capable of drilling holes from 2.5 mm to 40 mm in any sequential steps. Sharpening, profile, and driver type can be selected in any variant from standard tables respectively. There is an option for polishing and grade selection.SPGD-%u2026. Special Brazed Tip DrillsSPGD-%u2026 is a description of special gundrills with brazed tip belong ISCAR-GUNDRILLSline. SPGD-%u2026 gundrills are capable of drilling holes 2.5 mm to 40 mm in any sequential steps. Sharpening, profile, flute length and driver type can be selected in any variant. There is an option for polishing and grade selection.Table 6.11.2.2 %u2013 Standard SharpeningD0.25xD30%u02da15%u02da30%u02da30%u02da40%u02da 35%u02daStandard sharpening for 0.9 to 4 mm drill diametersD30%u02da12%u02da20%u02da20%u02da30%u02da25%u02da12%u02da 0.3-0.50.25xDStandard sharpening for 4 to 32 mm drill diameters15%u00b0 20%u00b025%u00b0%u00d8Dh5D/4%u00b10,0512%u00b020%u00b00,3/0,512%u00b025%u00b020%u00b0Standard sharpening for 32 to 40 mm drill diametersNote: For special or semi-standard gundrills, special geometries will be offered to match the application.