GUNDRILLS USER GUIDE Deep Hole Machine Accessories Drill Sealed Sealing Support Driver Adjustment Bushing Housing Disk Bushing dapter Bushing Support Bushing Based on modified DIN 179 specify the “d” diameter of Indicate the “d” diameter of the drill the drill. Carbide bushing is delivered only on request. d1 D1 d L1 L d = Drill diameter +0.02 D Guide Bushings Support Bushing As the gundrill is not a self-centering tool and its radialrigidity is low (due to diameter to length ratio), a guideTool Ø “d1”Ext. Ø “D”Ext. Ø“D1”Length Length“L”“L1” bushing is an essential component for a proper gundrill 1,9 - 16,399 20 26 20 12 operation. The function of the guide bushing is to direct 1,9 - 25,999 30 38 26 16 the gundrill into the material during penetration. The 1,9 - 34 45 50 26 16 diameter of the guide bushing should be within 20 microns larger than the diameter of the drill. Dedicated gundrillmachines are equipped with a guide bushing system.Support Bushing with “V” Form Indicate the “d” diameter of the drill Sealing Disk d1 D1 Supplied with a single sealing disk or a protection sheet. Indicate the dimensions needed for your requirements. L1 L D 120º D Support Bushing with “V” Form Tool Ø “d1” Ext. Ø “D” Ext. Ø“D1” Length Length“ L”“ L1” B 1,9 - 16,399 20 26 20 12 Sealing Disk 1,9 - 23,799 30 38 26 16 Tool Ø “d” Ext. Ø “D” Thick. “ B” 2 to 6 20 3 3,1 to 15,559 32 4 15,6 to 25,999 40 4 26 to 40 90 4 Sealing Disk with Protection Tool Ø “d1” Ext. Ø “D” Thick. “ B” 2,9 - 5,249 20 7 5,25 - 14,449 32 11 14,45 - 25,999 40 12 26 - 41 90 12 308 ISCAR