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              Contact Us
              Hammond & Company Ltd
              Finway Road
              Hemel Hempstead
              Hertfordshire
              HP2 7PT
              England
              +44 (0)1442 212 211
              +44 (0)1442 252 003
              Send a Message
              We'll respond within 48 business hours
              Gundrill Diagram

              Before drilling commences the gun drill must be suported by a guide bush or pre-drilled start hole. Coolant is delivered directly to the cutting edges through the hollow shank and the chips are evacuated back along the V configuration of the tip and shank.

              The periphery of the cutting tip is contoured in such a way as to provide both support pads and lubrication galleries. The forces generated by the single sided cutting action act directly on the support pads creating a burnished surface finish and size control down to IT7 tolerances.

              Gun drill tips can be manufactured with a step that has either a cutting, or non cutting pilot. Coated tips are also available upon request. These may have a TiN (Titanium Nitride) coating, or a TiAlN (Titanium Aluminium Nitride) coating.

              A regrinding service is available at our Hemel Hempstead factory for gun drills, Ventec drills and Speedfeed drills.
              Hardened steel guide bushes and whip guides are available for purchase. See accessories.
              Driver Design Ref d h h1
              View PDF
              HAMMOND STANDARD
              Diagram
              CA 16 40  
              CB 25 50  
              CC 35 60  
              AMERICAN STANDARD
              Diagram
              Diagram
              AA 1/2" 38 26
              DM 3/4" 70 46
                     
                     
                     
              AC 1.00" 70 55
              AD 1.25" 70 55
              AE 1.50" 70 55
              EUROPEAN STANDARD
              Diagram
              AF 10 40 24
              AK 16 45 31
              AG 20 70 34
              AH 25 70 34
              AJ
              32
              70
              34
               
              Driver Design Ref d h h1
              Diagram AN 16 50 47
              WELDON
              Diagram
                BF 16 48 24
              h2 BG 20 50 25
              17 BH 25 56 32
              19 BJ 32 60 36
              19
              BK 40 70 40
              Diagram DG 10 60 M6X0.5
              DH 16 80 M10X1.0
              DK 25 100 M16X1.5
              DL 36 120 M25X1.5

              Ordering Information


              When ordering Gun Drills please state diameter, overall length, driver design and, where possible, the material to be cut. There are numerous cutting geometries available for the Gun Drills carbide tip.
              Alternatively, go towards the end of this website and order by Product Codes.


              Cutting Head Contours



                 
              View PDF
                 

              Tubular Shank Dimensions


              Hammond gun drill shanks are manufactured from high quality chrome molybdenum steel and are designed to achieve maximum coolant flow, chip clearance and torsional rigidity.

              ? Range ? Tube ? D Range ? Tube ? D Range ? Tube
              3,00-3,14 2,8 6,50-6,99 6,2 13,90-14,89 13,4
              3,15-3,39 2,95 7,00-7,29 6,7 14,90-15,89 14,4
              3,40-3,64 3,2 7,30-7,59 7,0 15,90-16,89 15,3
              3,65-3,87 3,45 7,60-7,94 7,3 16,90-17,89 16,2
              3,88-3,99 3,65 7,95-8,34 7,6 17,90-18,89 17,2
              4,00-4,19 3,8 8,35-8,54 8,0 18,90-19,89 18,2
              4,20-4,44 4,0 8,55-8,94 8,2 19,90-20,89 19,2
              4,45-4,74 4,25 8,95-9,34 8,6 20,90-21,89 20,2
              4,75-4,97 4,55 9,35-9,94 9,0 21,90-22,89 21,2
              4,98-5,24 4,75 9,95-10,64 9,6 22,90-23,89 22,2
              5,25-5,49 5,0 10,65-10,94 10,3 23,90-24,89 23,2
              5,50-5,74 5,25 10,95-11,94 10,6 24,90-26,89 24,2
              5,75-5,94 5,5 11,95-12,54 11,6 26,90-28,89 26,2
              5,95-6,29 5,7 12,55-12,94 12,2 28,90-30,89 28,2
              6,30-6,49 6,0 12,95-13,89 12,6 30,90-33,00 30,2
              Updated August 2013

              Hammond Recommended Geometry for Various Materials



              View PDF
              Drill Diameter. Primary Land Chamfer at 20°
              ? 3,0 to 12,0 0,4 – 0,6 0,4 – 0,6
              ? 12,0 to 25,0 0,6 – 0,8 0,6 – 0,8
              ? 25,0 to 32,0 0,8 – 1,2 0,8 – 1,2
              Diagram Diagram

              Facet Description NG4 Aluminium
              (Order code B)
              NG13 Grey Cast Iron
              (Order code E)
              NG80 Flat Bottom
              (Order code G)
              Horiz. Vertical Horiz. Vertical Horiz. Vertical
              A  Outer Primary +15° +15° +40° +12° +1° +12°
              B Outer Secondary +14,5° +20° +39,5° +25° +1° +20°
              C Inner Relief -20° +15° -20° +12°
              D  Front Clearance +25° +35°
              E Oil Dub-Off -25° -15° -25° -12° 25° -12°
              Point Position D/4 D/4 D/2
              Facet Description NG82 Super Alloys
              (Order code H)
              NG86 Wood Grind
              (Order code K)
              NG90 Malleable MATL
              (Order code L)
              Horiz. Vertical Horiz. Vertical Horiz. Vertical
              A  Outer Primary +42° +14° +30° +20° +20° +20°
              B Outer Secondary +41,5° +25°
              C Inner Relief -17° +14° -20° +20° -20° +20°
              D  Front Clearance +30° +30° +25°
              E Oil Dub-Off -22° -15° -25° -15° -25° -15°
              Point Position D/5 D/3,5 D/4

              Cutting Parameters


              Gun drills operate at relatively high cutting speeds with low feeds per revolution. Approximate starting values are shown in the charts on this page.


              View PDF
              Diagram
              Feed rates are critical to chip formation. The values shown here may need to be adjusted for optimum results.


              Diagram
              Reliable chip evacuation and good surface finish can only be ensured if sufficient coolant volume and pressure are available.

              Pressure and volume vary according to length/diameter ratio.


              Diagram
              Chart shows maximum unsupported flute length


              Diagram

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